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Monkey: Black-Box Symmetric Ciphers Designed for MONopolizing KEYs
[chapter]
1998
Lecture Notes in Computer Science
We consider the problem of designing a black-box symmetric cipher that leaks information subliminally and exclusively to the designer. We show how to construct a cipher which we call 'Monkey' that leaks one key bit per output block to the designer of the system (in any mode). This key bit is leaked only if a particular plaintext bit is known to the designer (known bit/message attack which is typically available in plain ASCII). The attack is of kleptographic nature as it gives a unique
doi:10.1007/3-540-69710-1_9
fatcat:hbwgpdm37bgjpb6l4qrvbx7rf4