On 10/30/05, Arash Partow [EMAIL PROTECTED] wrote:
How does one properly use a symmetric cipher as a cryptographic hash
function? I seem to be going around in circles.
The usual method is to feed the data into the key slot of the
cipher, and to use a fixed IV in the plaintext slot. Then, add
Not so... the SHA family are all unbalanced Feistel structures.
Sorry, I guess I am thinking of AES. I don't know where I got the
doesn't need to be invertible bit, I must be conflating it with
something else.
He should also take a look at OCB, CCM, and CBC-MAC modes.
Perhaps he intends to
(particularly AES) as cryptographic hash functions?
btw I know that hash functions and symmetric ciphers share the same
structural heritage (feistel rounds etc...), I just don't seem to be
making the usage link at this point in time... :D
The latest hashes, such as SHA-1, gave up on Feistel. It's
At 01:33 2005-11-01 -0600, Travis H. wrote:
The latest hashes, such as SHA-1, gave up on Feistel.
Not so... the SHA family are all unbalanced Feistel structures.
Basically, for SHA-1 a complex function of 4 words and key material
(in this case expanded data to be hashed) is combined with the
In message [EMAIL PROTECTED], Trav
is H. writes:
How does one properly use a symmetric cipher as a cryptographic hash
function? I seem to be going around in circles.
Isn't this is like asking a mechanic how to use a screwdriver as a hammer?
Given that we seem to know much more about block
Travis H. [EMAIL PROTECTED] writes:
How does one properly use a symmetric cipher as a cryptographic hash
function? I seem to be going around in circles.
Isn't this is like asking a mechanic how to use a screwdriver as a hammer?
Not in the least. Building new strong tools by using older tools
/etc that explain the implementation/use of
symmetric ciphers (particularly AES) as cryptographic hash functions?
btw I know that hash functions and symmetric ciphers share the same
structural heritage (feistel rounds etc...), I just don't seem to be
making the usage link at this point in time... :D
seem like a joy etc..
Are there any papers/books/etc that explain the implementation/use of
symmetric ciphers (particularly AES) as cryptographic hash functions?
btw I know that hash functions and symmetric ciphers share the same
structural heritage (feistel rounds etc...), I just don't seem
