Register Shuffling

Protection ID: register_shuffling

Register Shuffling randomizes the register allocation in your application binary so that the same source code compiles to different register assignments. This breaks pattern-based analysis that relies on consistent register usage to identify similar code structures.

Configuration

{
  "protections": {
    "register_shuffling": "medium"
  }
}

{
  "protections": {
    "register_shuffling": "medium"
  }
}

Available levels: "simple", "medium", "complex".

How It Works

Compilers typically produce consistent register assignments for similar code patterns. Reverse engineers exploit this consistency to recognize common operations, match known code patterns, and compare code across different builds.

Register Shuffling reassigns registers so that the same operations use different registers across methods and builds. This breaks the register-level signatures that analysts and automated tools use for pattern matching and code comparison.

Intensity Levels

When to Use

Register Shuffling is effective against automated binary comparison tools and pattern matching engines. It is most impactful when combined with Instruction Substitution and Polymorphic Builds, ensuring that each build produces a unique binary at the instruction level.

Related

• Instruction Substitution - Replace instruction patterns
• Polymorphic Builds - Unique binary per build
• Protections Overview - All available protections