Strong encryption

Lapo Luchini lapo at
Thu Jun 6 01:40:01 EST 2002

> | That would lessen encryption security, of course.
> All encryption is done in chunks, the size varies of course, usually 
> between 1 and 256 bits.

Of course, but even if block ciphers are usually used to encode data, 
they are usually used in OFB or other feedback mode that convert them to 
stream ciphers, so that equal blocks are NOT converted to equal blocks 
(this would of course lessen the security A LOT) so the fact that the 
original cipher is a block cipher is totally ininfluent and a change in 
a single bit in the plaintext creates changes from that block until the 
end, in the ciphertext.


BTW: using the cipher in ECB (without feedback) is much less secure, see 
the RSALABS FAQ for more infos or other crypto texts.

Lapo 'Raist' Luchini
lapo at (PGP & X.509 keys available) (ICQ UIN: 529796)

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