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[CISSP-D] Re: Cryptography - Hybrid Approach

from [joeyconcrete] Network Security [Permanent Link]
Subject: [CISSP-D] Re: Cryptography - Hybrid Approach
Date: Wed, 27 Oct 2004 22:00:19 -0000 


Subbarao,

You are correct.

PGP generates a random session key to be used as the symmetric key for
use with the selected algorithm (IDEA/AES/3DES). This is then used to
encrypt the message text. This session key is then encrypted using the
recipients public key. Both are included in the email and sent. The
recipient then decrypts the session key using their private key, this
is then used to decrypt the message.

If you take a look at this website it explains it well. Look under the
section titled "Only 128 Bit Encryption?"

    http://www.mccune.cc/PGPpage2.htm

GNUPG - You can change your preferred Cipher algorithm using the
SetPref command. See here for more information;

    http://ulf.zeitform.de/gnupg_prefs/

Hope this helps

Joe






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