cryptomedium

Strange DES

spbctf

Task: DES encryption with hint about '1 in 2^54' probability. Solution: Exploit DES weak key involution property where E(E(m,k),k)=m to decrypt by encrypting again.

$ ls tags/ techniques/
desblock_ciphersymmetricweak_key
des_weak_key_attackinvolution_property
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