PGP & GPG

Installing PGP 43

understand, including Advanced Encryption Standard (AES),

Cast, TripleDES, IDEA, and Twofish. The differences between

these ciphers are generally only of interest to cryptographers;

today, almost everyone uses AES. The “preferred” cipher is the

one your software will use by default when composing mes-

sages. Almost everyone composes messages in AES today, and

everyone with modern software can read it; it is best to leave it

as your preferred cipher.

One thing that sets PGP apart from other OpenPGP imple-

mentations is that it can use the IDEA cipher, but today’s PGP

doesn’t understand IDEA by default. If you want to read IDEA- ...