Hi,
after reading this http://www.pvv.org/~asgaut/crypto/thesis/node16.html
I understand: Encryption is performed Byte by Byte. In that case, the
result is as expected.
Thank you for your patience :-)
Regards,
Roland
Roland Bock wrote:
So, yes, if the IV (which is used in place of the "previous ciphertext
block" for the first message block) and message blocks up to a certain
point are identical, the ciphertext will be to that point as well, and
the XOR output for the next block will differ exactly where the bits
of the next message block differ. This is why you need to pick
different IV values per message.
Hi, yes, I am aware of this, and I would agree if I encrypted, say, 10
blocks with the first 9 being identical. In that case, of course, the
first 9 encrypted blocks of the ciphertext would be identical.
But I encrypted several texts of 4Bytes (much less than one block) which
differ in just the last Byte. I don't think that they should result in
output which also differs in just the last Byte.
Using CBC, btw, I get completely different results for very similar
input. This is what I would expect. It is padded to the block size, though.
Regards,
Roland
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