cryptoPromedium

Абсолютная безопасность (Absolute Security)

hackerlab

Task: XOR encryption service with assertion that rejects enc[i] == flag[i]. Solution: Statistical attack - collect ~2700 samples and find the missing byte value at each position (the one that never appears is the flag byte).

$ ls tags/ techniques/
xorinformation_leakoraclestatistical_attackfiltered_outputassertion_bypassbyte_exclusionrandom_oraclesampling_attack
Statistical analysis of filtered XOR outputsMissing byte detection through samplingInformation leak via output filteringByte-by-byte plaintext recovery
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