a. Consider the Davies and Price hash code scheme described in Section 11.4 and assume that DES
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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, . . . , MN can be altered without altering its hash code.
b. Show that a similar attack will succeed against the scheme proposed in [MEYE88]:
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a For clarity we use overbars for complementation We have mathrmEleftoverlineMi overlineHi1igh...View the full answer
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