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feal-linear-cryptanalysis - FEAL Cipher Linear Cryptanalysis Guide

Provides procedural guidance for performing linear cryptanalysis attacks and recovering encryption keys from FEAL-encrypted data.

Tags

Updated: 2026-09-17
feallinear-cryptanalysiscryptanalysisblock-cipherkey-recovery

Capabilities

Analyze FEAL cipher structureIdentify linear approximationsChain approximations across roundsCollect statistics from text pairs

Typical Inputs

Known plaintext-ciphertext pairsFEAL cipher implementationLinear cryptanalysis reference guide

Typical Outputs

Recovered FEAL encryption keysVerified cryptanalysis attack codeKey candidate statistical rankings

What this skill does

  • Analyze FEAL cipher structure
  • Identify linear approximations
  • Chain approximations across rounds
  • Collect statistics from text pairs
  • Recover round keys statistically
  • Derive full key from subkeys
  • Verify attack with known keys

Inputs

  • Known plaintext-ciphertext pairs
  • FEAL cipher implementation
  • Linear cryptanalysis reference guide

Outputs

  • Recovered FEAL encryption keys
  • Verified cryptanalysis attack code
  • Key candidate statistical rankings

Requirements

    Source

    • Spec: SKILL.md

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