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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:17:36
John Cutler (jcutler@via.net)
Wed, 2 Dec 1998 15:11:29 -0800
I've found what I think are three more errors in "Applied
Cryptography". I would appreciate it if somebody knowledgeable would
correct me if I'm wrong. (I'm using the sixth printing of the second
edition.)
On page 345, in the fifth line, it says "Divide the plaintext
block...". Since this paragraph describes decryption, it should
probably be "Divide the ciphertext block...".
On page 351 there are two descriptions of simple ways to turn a one
way hash function into a symmetric crypto algorithm. The first is in
CFB mode and the second is in OFB mode. However, as written, the
second appears to be CFB mode, the same as the first:
C_i = P_i XOR S_i; S_i = H(K, C_i-1)
P_i = C_i XOR S_i; S_i = H(K, C_i-1)
I think this is what was intended:
C_i = P_i XOR S_i; S_i = H(K, S_i-1)
P_i = C_i XOR S_i; S_i = H(K, S_i-1)
On page 361, there is a paragraph which begins "Unfortunately, the
simpler mode is also the least secure." The two triple encryption
modes under discussion are "Inner CBC" and "Outer CBC". It appears
that "Inner CBC" is the least secure of the two, but also the more
complex. (See Figure 15.1) This is confusing.
John
The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:17:36