Security amplification by composition: The case of doubly-iterated, ideal ciphers

William Aiello, Mihir Bellare, Giovanni Di Crescenzo +1

We investigate, in the Shannon model, the security of constructions corresponding to double and (two-key) triple DES. That is, we consider F_{k1}(F_{k2}(.)) and F_{k1}(F_{k2}^{-1}(…