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Prerequisites & Requirements

• JavaScript Internals: Proficiency in ES6+ syntax, bitwise operators, and Buffer object manipulation.
• Obfuscation Patterns: Familiarity with Control Flow Flattening and state-machine-based execution logic.
• Number Theory: Basic understanding of modular arithmetic and the concept of a Modular Multiplicative Inverse .
• AST Fundamentals: Conceptual knowledge of Abstract Syntax Trees and how they represent code structure.

What will you learn?

• Deconstructing Control Flow Flattening: Manually tracing nested while-switch loops to normalize flattened logic into a linear execution path.
• Algorithm Reversal: Reversing deterministic shuffling/permutation algorithms by identifying loop invariants and index dependencies.
• Cryptographic Recovery: Applying modular inverses to undo non-linear transformations (Modular Multiplication) within a data pipeline.
• Data Normalization: Handling underflow and overflow in modular operations ( e.g ., v - i * 5 % 256).

Tools

• Runtime: Node.js (for testing recovery scripts).
• Formatting: JS Beautifier / AST Explorer (for structural analysis).