david at systemoverlord
Oct 5, 2011, 10:29 AM
Post #9 of 10
On Wed, Oct 5, 2011 at 1:09 PM, Robert J. Hansen <rjh [at] sixdemonbag> 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
david [at] systemoverlord
Gnupg-users mailing list
Gnupg-users [at] gnupg