Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts - AppSealing (2022)

Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts - AppSealing (1)

Code obfuscation figures among one of the most preferred application security techniques to guard against application hacking. It is one of the most recommended AppSec initiatives by security professionals around the world and often takes care of the bare minimum security needs of your application. More often than not, this technique acts as a primary defense mechanism against hacking attempts and guards against common attacks, like code injection, reverse engineering, and tampering with personal information of customers and application users.

Code obfuscation is the modification of executable code so that it is not available for comprehension, interpretation, and execution. The source code itself is obfuscated, so that it becomes unintelligible and impossible for a third-party to understand it, leave alone execute it. Code obfuscation does not impact the application’s interface meant for the end user or the intended output of the code. It is just a precautionary way to render the code unusable for a potential hacker, who may lay their hands over the executable code of an application.

Why is Code Obfuscation Required?

Code obfuscation is particularly useful for open-source applications, which pose a huge disadvantage in terms of hackability of code for personal gains. By making an application hard to reverse engineer, developers ensure that their product’s intellectual property is guarded against security threats, unauthorized access, and discovery of application vulnerabilities. This process restricts the malicious access to source code, and depending upon the type of obfuscation technique implemented, it ensures varied levels of code protection. The time, cost, and resource factor tilt the scale in favor of abandoning the code when it is obfuscated since the decompiled code is rendered unintelligible.

Types of Code Obfuscation Techniques

Obfuscation acts at multiple levels – it is applied either at the level of semantic structure/lexical code structure or at the level of data structure/control flow. Obfuscation techniques also vary according to the operation they perform on the code. Essentially, the security team, in consultation with the development team, decides which type of obfuscation to employ on the code.

Rename Obfuscation

This technique involves naming variables confusingly so that the original intent of using them is intelligently masked. Methods and variables are renamed using different notations and numbers, which makes it difficult for decompilers to understand the control flow. This obfuscation technique is usually used to obfuscate application code developed in Java, .NET, and Android platforms. This falls under the overall category of layout obfuscation, targeting the source code directly to bring about a defense layer for the application.

Example of a Rename Obfuscation Method

Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts - AppSealing (2)

Source: PreEmptive

Data Obfuscation

This technique targets the data structures used in the code, so that the hacker is unable to lay hands on the actual intent of the program. This may involve altering the way data is stored through the program into memory and how the stored data is interpreted for displaying the final output. There are different variants for this technique:

1. Aggregation Obfuscation

This alters the way data is stored in the program. For example, arrays could be broken down into many sub-arrays, which could then be referenced at different places of the program.

2. Storage obfuscation

This changes the very manner in which data is stored in memory. For example, developers can shuffle between local to global storage of variables, so that the real nature of variable behavior is obfuscated.

(Video) Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts

3. Ordering obfuscation

This method reorders how data is ordered by not altering the behavior of the program/code snippet. Developers accomplish it by developing a separate module which is called for all instances of the variable reference.

4. String encryption

This method encrypts all readable strings and hence results in unreadable code. These need to be decrypted at runtime when the program is executed.

5. Control/Code Flow Obfuscation

How control is passed from one section of the codebase to another plays a critical role in determining the intent of the program. Obfuscating this flow is usually the most remunerative way of confusing mischief at play. This obfuscation method keeps hackers at bay without letting them decipher how and why the code is adopting a particular flow.

One of the most common ways of implementing this obfuscation method is to use arbitrary and unexpected statements, adding unnecessary case-switch statements (dead code) that would never be executed. These statements serve the purpose of nothing more than confusing the intended hacker. This alteration in the order of program execution statements is especially helpful in the case of conditional program orientation.

Example of Control Flow Obfuscation

Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts - AppSealing (3)

Source: PreEmptive

Debug Obfuscation

Debug information often comes in handy in knowing critical information about program flow, flaws in the program through decompiling, and recompiling source code. It is important to mask such identifiable information by changing their identifiers, line numbers, or stopping the access to debug information altogether.

Address Obfuscation

Attacks that exploit memory programming errors, especially with non-memory safe languages, such as C, C++, have become commonplace. Errors like unchecked array access often result in security vulnerabilities. The address obfuscation method makes the process of reverse-engineering difficult, as each time the transformed code is executed, the virtual addresses of the code and data of the program are randomized. This makes the effect of most memory-error exploits non-deterministic, with only a very small chance of success.

Example of Address Obfuscation

Code Obfuscation: A Comprehensive Guide Against Reverse-Engineering Attempts - AppSealing (4)

Source: ScienceDirect

Custom Encoding

Using this method, developers encode strings using a custom algorithm and provide a decoder function to get back the original code.

(Video) App Shielding vs In-App Protection

Passing Arguments at Runtime

The program can be changed to expect arguments at runtime. This requires the user to have both the code as well as the decryption key to decrypt the variables.

The security team may also choose to deploy more than one technique concurrently to implement a layered defense approach for protecting applications against different security threats.

Determining Quality of Obfuscation Method

The success of code obfuscation is dependent on several parameters that determine the quality of code transformation. The quality of an obfuscation technique should be determined by the combination of the following factors:

Strength and resilience

An obfuscated code is only as good as its weakest link. So the best way to check for the quality is to check how much resistance is shown by the obfuscated code when de-obfuscation is tried out. The more effort and time that it requires to break the code, the better the obfuscation.

Differentiation and Potency

This shows the extent to which the obfuscated code is different from the original code. The depth of control flows, nesting levels, and inheritance levels are used to increase the complexity of the source code. The code obfuscation increases this level of complexity.


The obfuscated code needs to be indistinguishable from the original source code so that the attacker is confused about the obfuscated section. This makes reverse engineering a difficult proposition to undertake for the attacker. This factor depends from one context to another and is often a crucial factor in evading automated reverse engineering attacks.


It is defined as the time and resources expended to execute obfuscated code in comparison with the non-obfuscated code. Some performance considerations need consideration while implementing an obfuscated code. An intelligently obfuscated code should serve the purpose of confusing the attacker using prudent techniques and without unnecessarily expending cost/resource.

Does Obfuscation Impact Code Performance?

Since code obfuscation brings about deep changes in the code structure, it may bring about a significant change in the performance of the application as well. In general, rename obfuscation hardly impacts performance, since it is only the variables, methods, and class which are renamed. On the other hand, control-flow obfuscation does have an impact on code performance. Adding meaningless control loops to make the code hard to follow often adds overhead on the existing codebase, which makes it an essential feature to implement, but with abundant caution.

A rule of thumb in code obfuscation is that more the number of techniques applied to the original code, more time will be consumed in deobfuscation. Depending on the techniques and contextualization, the impact on code performance usually varies from 10 percent to 80 percent. Hence, potency and resilience, the factors discussed above, should become the guiding principles in code obfuscation, as any kind of obfuscation (except rename obfuscation) has an opportunity cost.

Most of the obfuscation techniques discussed above do place a premium on the code performance, and it is up to the development and security professionals to pick and choose techniques best suited for their applications. Techniques like binary linking combine multiple input libraries into fewer output libraries. Though this may result in lighter applications and allow a lesser interface for the hackers to play with your app code, decompilation at runtime for code execution becomes a hassle and often increases code execution time. These trade-offs need to be decided upfront, so that a security roadmap takes them into consideration and adds an appropriate layer of protection while running code into the live environment. In short, the more potent and complex the obfuscation, the greater the performance overhead.

Benefits of Code Obfuscation

Many advantages stem from the way the security team implements code obfuscation in the applications, especially for those hosted on open source platforms. Given the untrusted environment, it is always better to deploy an obfuscated application, which makes it harder for the attackers to review the code and analyze the application. This process ensures that there are no loopholes left for debugging and tampering and redistributing the pseudo application for criminal gains. This layer of protection is especially indispensable for applications dealing with business-critical personal information of consumers.

Most obfuscators also optimize the code by removing not-so-useful metadata, unused dead codes, or duplicate codes. This minification, in turn, speeds up the compilation process and results in quicker code execution and faster results, thus upping the ante on code performance.

Another major advantage accruing out of code obfuscation is that it renders an application hard to reverse-engineer, which means that code deployment in open source platforms is no longer a worry. Iterative code obfuscation is especially famous if multiple layers of security are to be applied. In this technique, the security team applies one or more obfuscation algorithms, with the output of the previous algorithm serving as an input to the next in line and so forth. This way, the attacker can get confused about the original intent of the program and what is visible to them, ultimately resulting in the failure of deobfuscation attempts.

(Video) Bypassing root detection in an Android app using Objection and Frida

Code obfuscation is a practical way of handling threats and weed out fun-attackers out of the way, as it requires serious effort, skill, resources, and time to crack an obfuscated code. Even if hackers are successful at it, the deobfuscated piece may not resemble the original code much. Though actual measurements in terms of their effectiveness are hard to find, most companies obfuscate code for security as well as proprietary reasons.

The Downside of Code Obfuscation

All the obfuscation techniques do have an impact on the code performance, however minimal. Depending on the part of code obfuscated, and the complexity of algorithms obfuscated, it may involve a good percentage to deobfuscate the code as well.

Most of the automated deobfuscators can reverse-engineer an obfuscated application. While obfuscation can only delay the process of reverse engineering, it does not make it impossible.

Some anti-virus software may also alert their users when they visit a site with obfuscated code, as the obfuscation can also be used to hide malicious code. This may deter users from using legitimate applications and drive them away from trusted corporations.

Should you Obfuscate your Code?

Considering the pros and cons of code obfuscation, a pertinent question is: should you even bother applying code obfuscation? The short answer is: Yes. Code obfuscation, at the very least, transforms a program into a piece of code that is difficult to understand but keeps the functionality intact. The challenges that it poses for reverse engineering and cyber-criminals are reason enough to obfuscate your code. A strong binary-level obfuscation, with advantages accruing to program performance due to code minification, are strong enough reasons for implementing a strategic code obfuscation.

For better results, security experts recommend implementing code obfuscation with other security mechanisms, like code replacement, code tampering detection, runtime application self-protection (RASP), watermarking, encryption, server-side protections, etc. This makes it hard for attackers to complete their activities on time. There are some obfuscation tools available that analyze the application’s runtime behavior to identify performance-sensitive code and indicate those portions of code that could impact performance if strong obfuscation techniques are applied.

Tools for Code Obfuscation

There are a few tools for Android Studio, such as ProGuard and DexGuard. Open-source obfuscators in Java include ProGuard, which is a class file shrinker and removes unused classes. It helps in renaming the remaining classes with meaningless names. The resultant JAR files are hard to reverse-engineer.

Obfuscating Python


This is a command-line interface tool to obfuscate python scripts and bind obfuscated scripts to fixed machine scripts. It helps in the obfuscation of Python scripts by protecting constants and strings and co_code of each function during runtime. It also verifies the license file of obfuscated scripts during execution. It allows developers to replace original python scripts with the obfuscated script seamlessly.

Obfuscating JavaScript

This is a famous tool that obfuscates JavaScript and transforms the original JS file into an altogether new representation, which is harder to understand and re-use, without changing the functionality. It performs different transformations on the code, such as debug protection by disabling console output, variable and function renaming, string removals, dead code injection, and self-defending features. It has a simple-to-use interface, wherein the user uploads the JS file and, based on the level of obfuscation required, chooses the appropriate options – ranging from renaming global variables, rotating or shuffling string arrays, encoding string arrays, performing Unicode on escape sequences by converting all strings to their Unicode representation, etc. It also includes control flow flattening, which hinders comprehension of the program source code. This transformation, though, impacts the code performance by slowing down runtime speed by about 1.5x.


This is another such tool which helps debug the obfuscated JavaScript code. A separate source map may be useful to debug code in the production environment and enables the development team to upload sourcemap to a private location (not known outside).


It works in CLI mode and has a great variety of options to minify, obfuscate, and beautify JS code. It consists of a parser that produces Abstract Syntax Tree (AST) from JS, mangler component to reduce names of variables and methods to single-letters, and a compressor component that uses transformations to optimize the AST into a smaller one.

One disadvantage of JavaScript is that it cannot be completely deobfuscation-proof. This is because JS essentially runs in the browser, and the browser’s JS engine needs to read it to render the resources. Hence, this capture point cannot be dispensed with.

Obfuscating PHP

PHP Obfuscator by Naneu

This is an obfuscator tool that parses PHP and obfuscates variable names and methods. This library protects PHP from deobfuscators, like UnPHP, and is useful for running code in the native PHP environment.

Yakpro PO

This tool parses PHP code using PHP Parser 4.x and is available as a GIT clone. This results in the PHP compiler being able to understand the redistributed code, but not by humans who may tamper with the source code. It implements control flow obfuscation, removes all comments, indentation, and string literals, iteratively obfuscates the whole program directory, and implements renaming obfuscation.

PHP Compactor library is another open-source library obfuscator tool that compacts and compresses the PHP codebase. Spaces, empty lines, and comments are removed and strings encoded.

Obfuscating HTML

HTML is simply marked-up text which is beautified using HTML tags. Obfuscating HTML is usually done through converting it into JavaScript, converting each HTML line into its corresponding numeric code, or performing a combination of both the methods. Though this is often effective, it increases the negligible size of the pure HTML two to three times, as a code overhead is added at each stage of transformation.

HTML Field Obfuscation (HFO) is often ignored as the traditional security approach focuses primarily on server-side security. Some of the security vulnerabilities are present in-app. Attacks like man-in-the-browser inject scripts to attach themselves to critical fields, like username and password, and tap on the credentials as the users type in. Anti-fraud applications use HFO to prevent scripts from execution.

This approach is designed to confound attacks that use the browser-based application in identifying target fields. In addition to encrypting the field values, decoy fields are also used to distract attackers.

Obfuscating C, C#, and C++

The best way to obfuscate the C code is to compile it and distribute only the binaries. This makes reverse-engineering the distributed code to its original form difficult. C/C++ machine code output after decompilation is itself obfuscated, hence it involves a level of obfuscation built-in. This enables the technical protection of intellectual property.

Another Tool for Language Recognition (ANTRL) is a parser generator which takes C/C++ source code as an input file, captures the implied hierarchy of the input, and transforms it into AST. Based on the structure obtained, each node represents meaningful components of the construct. This becomes a base for implementing the obfuscation algorithm by restructuring the nodes and reviewing its performance and resiliency post obfuscation.

C# code, in comparison to C/C++, can be reverse-engineered more easily. This is because the C# assemblies contain metadata that C++ do not. Also, C# maps to an intermediate language which is easier to decompile to the source code than C/C++. Some features of automated obfuscator tools include user definable list of preserved names, predefined list of reserved names for C#, and stripping comments.

Crypto Obfuscator makes use of sophisticated obfuscation techniques to guard C# code from reverse engineering. These include symbol renaming to unintelligible names, hiding calls from external methods to hide critical methods, string encryption, control flow obfuscation, etc.


All said, code obfuscation in isolation is not enough to handle complex security threats. Though it makes it difficult to deobfuscate code, the availability of automated tools and hackers’ expertise does not make it impossible to reverse-engineer.

Thus code obfuscation is not a one-stop-shop solution for all application security needs. Dependent on the security need, nature of application, and performance benchmark, the dev team could consider implementing a host of code obfuscation techniques in order to protect their code in an untrusted environment. These should be done taking into consideration pros and cons of each technique. This strategy should complement other AppSec initiatives, like encryption, RASP, data retention policies, etc. When used along with RASP tools, like AppSealing, it serves as a powerful antidote against contemporary security threats.

Frequently Asked Questions

1. Is obfuscation the same as encryption?

No, obfuscation and encryption are not the same. Obfuscation is the process of making data hard to interpret. Encryption on the other hand involves converting the content into unreadable format so only authorized users can decode it by applying an encryption key. Obfuscation doesn’t require a key and the content can be deciphered if the original algorithm is known.

2. Is obfuscated code safe?

Obfuscation is a promising security measure that protects against intrusions. Obfuscation however doesn’t guarantee complete security. It should be used only as an additional security layer and cannot be used as a substitute for other security best practices.

3. Can you reverse-engineer obfuscated code?

Obfuscation does not provide complete protection against reverse-engineering. However, obfuscation makes it extremely hard to reverse engineer the code. It only delays the process of reverse engineering.

4. Does obfuscation affect performance?

Obfuscation does have an impact on code performance. However, the impact varies on the type of obfuscation applied. Rename obfuscation doesn’t impact performance whereas control-flow obfuscation can have a considerable impact on code performance.


Can obfuscated code be reverse engineered? ›

The results show that it is possible to reverse engineer obfuscated code but some parts. Obfuscation does protect the code, as all the variable names are changed and every unused method are removed, as well as some methods changed to non-con- ventional ways to program.

What is code obfuscation used for? ›

Obfuscation means to make something difficult to understand. Programming code is often obfuscated to protect intellectual property or trade secrets, and to prevent an attacker from reverse engineering a proprietary software program. Encrypting some or all of a program's code is one obfuscation method.

What is obfuscation coding practice? ›

What is obfuscation? To obfuscate a code means making it difficult to understand for the reader. It is a common practice in programming used to protect intellectual property such as the source code. The main goal of code obfuscation is to make reverse engineering as difficult as possible for the opposing side.

How do I remove code from obfuscation? ›

Press F12 to open Developer Tools inside Chrome. Now switch to the Scripts tab, right-click and choose De-obfuscate source. That's it!

What data obfuscation technique is intended to be reversible? ›

Encryption and tokenization are reversible in that the original values can be derived from the obfuscated data. Data masking, on the other hand, is irreversible if done correctly.

What is the difference between obfuscation and encryption? ›

What's the Difference? Obfuscation, also referred to as beclouding, is to hide the intended meaning of the contents of a file, making it ambiguous, confusing to read, and hard to interpret. Encryption is to actually transform the contents of the file, making it unreadable to anyone unless they apply a special key.

Is code obfuscation secure? ›

Ultimately, code obfuscation alone is not enough to handle complex mobile security threats. Although it makes it more difficult to read and understand an app's code, the availability of automated tools, when combined with hackers' expertise, does not make it impossible to reverse-engineer.

How do you write obfuscation code? ›

For example:
  1. Below is an obfuscated C code: int i;main(){ for (i=0;i[ "]<i;++i){--i;}" ]; read( '-' - '-' ,i+++"hell\ o,world!\n", '/' / '/' ));}read(j,i,p){ write(j/p+p,i---j,i/i);}
  2. Here is the deobfuscated version which a person can understand. int i; void write_char( char ch) { printf ( "%c" , ch); } int main() {
30 Jun 2020

How do attackers use obfuscation? ›

Obfuscation techniques make it difficult for hackers to understand code and data. The basic tenet of obfuscation involves scrambling objects so as to retain functionality while making objects look complicated [41].

Which tool can be used for obfuscation of source code? ›

DashO Android & Java Obfuscator a Java, Kotlin and Android application hardening and obfuscation tool that provides passive and active protection. KlassMaster Heavy Duty Protection, shrinks and obfuscates both code and string constants.

What is data obfuscation process? ›

Data obfuscation is the process of replacing sensitive information with data that looks like real production information, making it useless to malicious actors.

Does obfuscation affect performance? ›

Name obfuscation does not affect the performance and should always be used. You can virtualize methods that are not computationally intensive. Otherwise, control flow obfuscation should be used.

What is obfuscation in malware? ›

Obfuscation is one the many techniques used by malware to evade static analysis methods and traditional anti-malware solutions which rely on hashes and strings for malware detection and analysis.

How do I stop code obfuscation on Android? ›

Shrink, obfuscate, and optimize your app
  1. Customize which resources to keep.
  2. Enable strict reference checks.
  3. Remove unused alternative resources.
  4. Merge duplicate resources.

What is obfuscation in cyber security? ›

Obfuscation refers to the process of concealing something important, valuable, or critical. Cybercriminals use obfuscation to conceal information such as files to be downloaded, sites to be visited, etc.

What means obfuscation? ›

: to be evasive, unclear, or confusing. The suspect often obfuscated during the interrogation.

What is an example of obfuscation? ›

Obfuscation: Obfuscation is a noun for the act of casting shadow or muddling the facts. Example: The overwrought, pretentious wording of her term paper was a poor obfuscation of the fact that she hadn't researched her topic.

Is obfuscation a cryptography? ›

Obfuscation is defined as the transformation of a human-readable string to a string that is difficult for people to understand. In contrast to encryption, obfuscation includes no cryptographic key and the “secret” here is the operation itself.

Can encryption be reversed? ›

Encryption is a reversible transformation. It is useful only when encrypted data (ciphertext) can be reversed back to its original, unencrypted form (plaintext). If not reversible, the encrypted data are considered unreadable and unusable. This reversal process is referred to as decryption.

Should I use obfuscated VPN? ›

Censorship. If you live in a country that has a censorship problem, obfuscation is crucial. You will need it for your VPN encryption to work in the first place, as it will allow you to bypass restrictions.

What is opposite of obfuscate? ›

Opposite of to make obscure, unclear, or unintelligible. clarify. illuminate. clear up. enlighten.

Which of the following is the most common obfuscation? ›

2-XOR: This popular method of obfuscation conceals data so it cannot be analyzed. It does this by swapping the contents of two variables inside the code, such as: XOR EBX, EAX.

How do I unmask masked data? ›

To activate/deactivate the masking of PII data, select Utilities > Data > Unmask PII Data / Mask PII Data.

What is SQL obfuscation? ›

The obfuscation renders the source code bodies of the SQL functions, SQL procedures, and triggers unreadable, except when decoded by a database server that supports obfuscated statements.

Is obfuscator a virus? ›

Obfuscator: A type of malware that hides its code and purpose to make it more difficult for security software to detect or remove it. Virtool: A detection that is used mostly for malware components, or tools used for malware-related actions, such as rootkits.

How do I stop Unauthorised apps? ›

How to Stop Unwanted Apps Installing Without Permission on Android:
  1. Disable Auto-Updates For Apps. ...
  2. Log Out Of Your Google Account, Change Its Password And Remove It From Your Android Device. ...
  3. Block The Entry Of Malicious Apps. ...
  4. Restrict Background Data. ...
  5. Disable The “Installing Apps From Unknown Sources” Option.
24 Sept 2020

How can you protect your app with code obfuscation? ›

Code obfuscation will help conceal the logic and purpose of an app's code, while still keeping its functionality. By using obfuscation methods, it will be more difficult for an attacker to perform reverse engineering, analyze the code, and retrieve sensitive information. Quickly obfuscate your apps with Promon SHIELD™.

What is Android obfuscation tool? ›

One easy way to make it harder for hackers to attack an Android app is to use obfuscation to remove strings and variable names and in some cases prevent decompilation. While it's not a silver bullet – see caveats below – it's very easy to enable in an Android project and it does remove a lot of useful information.

Can obfuscated code be decompiled? ›

Code obfuscation is the process of making applications difficult or impossible to decompile or disassemble, and the retrieved application code more difficult for humans to parse.

Is it possible to reverse engineer program? ›

In order to perform reverse engineering, you need to combine skills in disassembling, network monitoring, debugging, API integration, several program languages, compilers, etc. You also have to be very careful when reversing software in order not to break copyright laws or harm your system.

How do I decompile obfuscated APK? ›

Following are the main steps.
  1. Convert APK to . jar. dex2jar can be used to convert APK file into . jar file. ...
  2. Decompile . jar file. The generated . ...
  3. Extract APK resources. The resources of the APK can be extracted via apktool . Install apktool from this link and run following command.
29 Aug 2021

Can you reverse engineer binary code? ›

It is possible to reverse engineer any binary irrespective of what language/compiler is used, but it depends on the knowledge of the reverse engineer who does that job (or) the developer who developed the tool that does that job.

Is decompiled legal? ›

Higher-level reverse engineering such as decompilation is illegal as it is a threat to the ideas and intellectual property of the software creators via recreating the source code, which is the protected element.

Are obfuscated servers safe? ›

Are obfuscated servers safe? Yes. Like a regular VPN, obfuscated servers provide a higher security and privacy level when you're browsing online. But, unlike a standard VPN server, an obfuscated server masks the fact that you're using a VPN in the first place.

What is a real life example of reverse engineering? ›

Reverse-engineering is often used to create replacement parts when the original parts for legacy equipment are no longer available. Reverse-engineering of computer parts is also done to enhance security. For example, Google's Project Zero identified vulnerabilities in microprocessors using reverse-engineering.

What are the 5 steps of reverse engineering? ›

Here are five steps to reverse engineer a product:
  1. Collect information. The first step in reverse engineering is to collect information about the product. ...
  2. Create a model or sketch. ...
  3. Begin disassembly. ...
  4. Evaluate the product. ...
  5. Reassemble.
13 Jul 2021

Is it illegal to decompile apps? ›

Decompiling is both illegal and wrong, unless it's your own work. You can learn what you need on Google, or find open-source stuff using it and learn from that. It's illegal to decompile ANYTHING without permission.

How do I know if an APK is obfuscated? ›

Reverse Engineering APKS: Guide To See If Obfuscation Works
  1. Rename app.apk to ...
  2. In a convenient location, paste your classes.dex (note your classes.dex directory )
  3. Using command line, go to dex2jar location and run this command: ...
  4. Your .jar should now be available on your dex2jar folder.
7 Oct 2017

Is it possible to decode APK? ›

Yes you can. Use online or offline tools, Tat will decompile apk.

Why do hackers reverse engineer? ›

In software testing, reverse engineering aids testers' understanding of viral and other malware code. In software security, reverse engineering is widely used to ensure that the system lacks any major security flaws or vulnerability.

What language do reverse engineers learn? ›

C++ If you want to crack corporate software or reverse engineer applications, you should invest your time in learning C++. The language gives you low-level access to system resources and analyzes machine code.

How can I reverse engineer myself? ›

Reverse Engineer Your Life to Work for You
  1. You are going to be the problem. ...
  2. Try to predict the mistakes ahead of time. ...
  3. Pretend you're going to get rejected 101 times. ...
  4. Choose one goal and write the steps backwards. ...
  5. Use someone else's cheatsheet. ...
  6. Take the opposite approach. ...
  7. Take a goal and break it apart.
17 Aug 2020

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