Girish Venkatachalam wrote:
The IV is used only for decrypting the first block
since after that the first block serves as the IV for
the second block and so on.
To answer ur question, the IV has to be known at both
sides along with the key.
There is no sound cryptological argument for not conveying
the IV as the first block of ciphertext. It should be a
random nonce, and should never be repeated. This argues
against using a shared value known in advance.
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