cryptoProhard

CryBaby

grodno_new_year_2026

Task: Flag split into two 14-byte halves, XORed together, then encoded through 1-20 random layers of base64/hex encoding. Solution: Iteratively detected and peeled encoding layers (18 total), then used known flag format "grodnogrodno{" and closing "}" as known plaintext to recover both halves via XOR properties.

$ ls tags/ techniques/
known_plaintextbase64multi_layer_encodinghexxor
flag_format_exploitationencoding_detectionlayer_peelingxor_known_plaintext
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