How to protect java code from decompilation?

The Java Virtual Machine needs only the class file for execution. The problem is that the class file can easily be decompiled into the original source code using Java decompiler tools. The best solution to prevent reverse-engineering is to obfuscate the class file so that is will be very hard to reverse-engineer.

How do I secure my Java code?

10 Java security best practices

1. Use query parameterization to prevent injection.
2. Use OpenID Connect with 2FA.
3. Scan your dependencies for known vulnerabilities.
4. Handle sensitive data with care.
5. Sanitize all input.
6. Configure your XML-parsers to prevent XXE.
7. Avoid Java serialization.
8. Use strong encryption and hashing algorithms.

How do you do obfuscation in Java?

Obfuscate Java Application Using ProGuard

1. Step 1: Download the proguard-ant-7.2.
2. Step 2: Create a configuration file that contains all the information about the application.
3. -injars: Specify the path of .
4. -outjars: It is a jar file that is created by the ProGuard, after obfuscation.

How do you encrypt a class in Java?

Java Cryptography – Encrypting Data

1. Step 1: Create a KeyPairGenerator object.
2. Step 2: Initialize the KeyPairGenerator object.
3. Step 3: Generate the KeyPairGenerator.
4. Step 4: Get the public key.
5. Step 5: Create a Cipher object.
6. Step 6: Initialize the Cipher object.
7. Step 7: Add data to the Cipher object.
8. Step 8: Encrypt the data.

What is secure in Java?

Java is secure due to the following reasons: Java programs run inside a virtual machine which is known as a sandbox. Java does not support explicit pointer. Byte-code verifier checks the code fragments for illegal code that can violate access right to object. It provides java.

How do you obfuscate a code?

Obfuscation techniques

1. Renaming. The obfuscator alters the methods and names of variables.
2. Packing. This compresses the entire program to make the code unreadable.
3. Control flow.
4. Instruction pattern transformation.
5. Dummy code insertion.
6. Metadata or unused code removal.
7. Opaque predicate insertion.
8. Anti-debug.

How do I obfuscate Java code in Eclipse?

How to try it out?

1. Download Stinger Java Obfuscator Eclipse Plugin here.
2. Copy com.licel.stringer.ide.eclipse.jdt.ui.jar into dropins folder of your Eclipse installation.
3. Restart Eclipse.
4. During the first run of the wizards set the following properties: path to installed copy of Stringer Java Obfuscator.