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Regarding DES/3DES

To: "ipsec@lists.tislabs.com" <ipsec@lists.tislabs.com>, "'Joern Sierwald'" <joern.sierwald@F-Secure.com>, "'Markku Savela'" <msa@anise.tte.vtt.fi>, "'Stephen Kent'" <kent@bbn.com>
Subject: Regarding DES/3DES
From: Ruheena Rashid <RuheenaR@future.futsoft.com>
Date: Tue, 16 May 2000 12:12:17 +0530
Organization: future software
Reply-To: "RuheenaR@future.futsoft.com" <RuheenaR@future.futsoft.com>
Sender: owner-ipsec@lists.tislabs.com

Hello

I have  query regarding using DES and 3DES for encryption.
RFC 2420 states that - for 3DES
"The keyed DES function is iterated three times, an encryption (E) followed 
by a decryption (D) followed by an encryption (E), and generates the 
ciphertext (C1) for the block. Each iteration uses an independent key: k1, 
k2 and k3. To decrypt, the order of the functions is reversed: decrypt with 
k3, encrypt with k2, decrypt with k1, and XOR with the previous cipher- 
text block."

Since 3 different keys are used in 3DES, is it that the second and third 
keys (k2 and k3) are generated using the first key(k1) ?

If not, then how are the second and third keys (k2 and k3) generated  ?

Regards
Ruheena Rashid.

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