cryptomedium
Кастом (Custom)
hackerlab
Task: Decrypt a custom substitution cipher where the seed depends on the filename. Solution: Used Known Plaintext Attack with flag format CODEBY{} and leetspeak pattern recognition to recover the substitution mapping.
$ ls tags/ techniques/
substitution_cipherleetspeakknown_plaintext_attackflag_format_attackpython_randomcustom_cipherprng_seed
Known Plaintext Attack using flag formatSubstitution cipher reversalLeetspeak pattern recognition
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