Freakancy

Prerequisites & Requirements

• Linguistic Cryptanalysis: Understanding of English letter frequency ( e.g ., ETAOIN SHRDLU).
• Cipher Structures: Familiarity with monoalphabetic substitution and the concept of mapping discrete symbols to a known alphabet.
• Pattern Recognition: Ability to identify common English word structures, apostrophes, and punctuation.

What will you learn?

• Known-Plaintext Attacks (KPA): Leveraging predictable flag formats (flag{...}) to establish an initial mapping of characters.
• Contextual Decryption: Utilizing "anchor words" ( e.g ., words with apostrophes like "I'm" or "don't") to narrow down vowel and consonant placement.
• Dictionary-Assisted Analysis: Applying dictionary lookups to resolve high-entropy words based on established letter patterns.
• Exhaustive Substitution: Systematically reconstructing a unique cipher alphabet through iterative testing.

Tools

• Python: For automating character substitution and string manipulation.