cryptoPromedium

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
🔒

Permission denied (requires tier.pro)

Sign in to access full writeups

Sign in with GitHub to continue. No email required.

$sign in

$ grep --similar

Similar writeups