encryption - AES/Blowfish: random IV vs. random data at the begining -

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In the encryption algorithm such as AES or Blowfish, the purpose of initialization vector (IV) has been understood (see also)

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But I'm not like to transmit IV every time and I want to use it every time (easy coding). To get the randomness of messages with the same general prefix, I will add a randomly generated random white block of the same size as the fourth to the beginning of the encrypting message when decryption occurs, I will ignore it / first I will leave the bytes.

Does this start of random data messages provide equal protection such as a random IV?

Four essentially "Block 0" for the mode that mixes the last block with the existing encryption is. Therefore, adding a random block is manually equivalent. For more information (and perhaps a better forum for such questions), see.

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