Question: a. Consider the Davies and Price hash code scheme described in Section 11.4 and assume that DES is used as the encryption algorithm: If Y

a. Consider the Davies and Price hash code scheme described in Section 11.4 and assume that DES is used as the encryption algorithm:

If Y = E(K, X), then Y′ = E(K′, X′) Use this property to show how a message consisting of blocks M₁, M₂, . . . , M_N can be altered without altering its hash code.
b. Show that a similar attack will succeed against the scheme proposed in [MEYE88]:

H Hi-1 E(M, Hi-1) =

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a For clarity we use overbars for complementation We have mathrmEleftoverlineMi overlineHi1igh... View full answer

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