CBC
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... payload data to be
protected. This specification describes the ESP use of CBC-mode
cipher algorithms.
...
... block cipher algorithms described or insinuated within
this document use Cipher Block Chaining (CBC) mode. This mode
requires an Initialization Vector (IV ...
...
More information on CBC mode can be obtained in [Schneier95].
...
... Note that when all three keys (k1, k2 and k3) are the same, DES-
EDE3-CBC is equivalent to DES-CBC. This property allows the DES-EDE3
...
... Baldwin, R. and R. Rivest, "The RC5, RC5-CBC, RC5-CBC- Pad, and RC5-CTS Algorithms", RFC 2040 ...
... Madson, C. and N. Dorswamy, "The ESP DES-CBC Cipher Algorithm With Explicit IV", RFC 2405prop ...