On Wed, Oct 5, 2011 at 1:09 PM, Robert J. Hansen <[email protected]> wrote: > On 10/5/11 11:01 AM, Thomas Harning Jr. wrote: >> Mr. Hansen, thanks for the correction on CTAK, made me re-look into the >> specific details of CTAK... whoops. Should have taken a look at the >> OpenPGP specification and noticed that CFB is what is used for all >> symmetric encryption. > > Goofs happen, man. :) > > Also, a note for anyone who's confused (what's CTAK? does GnuPG use CTAK > or CFB for symmetric encryption? etc.): CFB stands for "Cipher > Feedback", which is a particular mode of operation for symmetric > ciphers. CTAK is "Ciphertext Autokey", which is the exact same thing by > another name.
To be pedantic, CTAK is the general concept of incorporating the ciphertext into the keystream. CFB is a precise way of implementing CTAK. PCBC also incorporates the plaintext into the input for the encryption process, IIRC. -- David Tomaschik, RHCE, LPIC-1 System Administrator/Open Source Advocate OpenPGP: 0x5DEA789B http://systemoverlord.com [email protected] _______________________________________________ Gnupg-users mailing list [email protected] http://lists.gnupg.org/mailman/listinfo/gnupg-users
