Comparison of Different Forms of DES Multiple Encryption 

# of # of Keys Computation Storage Type of Attack

Encryptions

single 1 256 - known plaintext

single 1 238 238 chosen plaintext

single 1 - 256 chosen plaintext

double 2 2112 - known plaintext

double 2 256 256 known plaintext

double 2 - 2112 chosen plaintext

triple 2 2112 - known plaintext

triple 2 256 256 256 chosen plaintext

triple 2 2120-t 2t 2t known plaintext

triple 2 - 256 chosen plaintext

triple 3 2112 256 known plaintext

triple 3 256 2112 chosen plaintext

NOTE : the most secure form of multiple encryption is triple-DES with three distinct keys

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