cryptomedium
Четырёхслойный шифр (Four-Layer Cipher)
hackerlab
Task: Decode a Quadrifid cipher with 22 three-digit coordinates (digits 1-4). Solution: Recognized Bifid/Trifid family cipher with 4 layers; layers 1-3 map to letters via 3x3x3 cube, layer 4 encodes digits for leetspeak message.
$ ls tags/ techniques/
leetspeakmulti_layer_encodingclassical_cipherquadrifidtrifidbifidpolybius_cube3d_ciphercoordinate_cipher
3D coordinate to character mappingMulti-layer cipher analysis (Bifid/Trifid/Quadrifid family)Leetspeak pattern recognition in partial plaintextLayer-specific encoding rules identification
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