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Caesium

Caesium is a powerful Java bytecode obfuscator written by sim0n for fun, and released for the public.

Image of Caesium UI

Currently available mutators

  • Class Folder (Turns classes into folders)
  • Control Flow
  • Crasher (Will crash almost every GUI based RE tool)
  • Local Variable
  • Line Number
  • Number
  • Polymorph
  • Reference (invokedynamics)
  • String
  • Trim (Currently only trims math functions)

Notes

You have to add every dependency your jar relies on. Caesium is very optimised and the performance loss shouldn't be more than 5-10% (unless you're using reference mutation)

Usage

  • Run the jar.
  • Select mutators in the mutators tab.
  • Hit mutate. Done!

Community

If you want to join the discord for Caesium to talk, ask questions or anything then feel free to join the discord

Special thanks to

yourkit logo

YourKit is the creator of YourKit Java Profiler, YourKit .NET Profiler, and YourKit YouMonitor. They support open source projects with their fully featured application profilers. It's used to ensure that this project will be as fast as possible.