-more than one block the normal inter-packet chaining is used, but for
-the first block new random IV is selected in each packet. In this mode
-the IV is appended at the end of the last ciphertext block and thus
-delivered to the recipient. This mode increases the ciphertext size by
-one ciphertext block. Note also that some data payloads in SILC are
-capable of delivering the IV to the recipient. When explicitly
-encrypting these payloads with randomized CBC the IV MUST NOT be appended
-at the end of the ciphertext, but is placed at the specified location
-in the payload. However, Message Payload for example has the IV at
-the location which is equivalent to placing it after the last ciphertext
-block. When using CBC mode with such payloads it is actually equivalent
-to using randomized CBC since the IV is selected in random and included
-in the ciphertext.
+more than one block the normal IV chaining is used, but for the first
+block new random IV is selected in each packet. In this mode the IV
+is appended to the ciphertext. If this mode is used to secure the SILC
+session, the IV Included flag must be negotiated in SILC Key Exchange
+protocol. It may also be used to secure Message Payloads which can
+deliver the IV to the recipient.