mcrypt_create_iv Create an initialization vector (IV) from a random source stringmcrypt_create_iv intsize intsource mcrypt_create_iv is used to create an IV. mcrypt_create_iv takes two arguments, size determines the size of the IV, source specifies the source of the IV. The source can be MCRYPT_RAND (system random number generator), MCRYPT_DEV_RANDOM (read data from /dev/random) and MCRYPT_DEV_URANDOM (read data from /dev/urandom). If you use MCRYPT_RAND, make sure to call srand() before to initialize the random number generator. ]]> The IV is only meant to give an alternative seed to the encryption routines. This IV does not need to be secret at all, though it can be desirable. You even can send it along with your ciphertext without loosing security. More information can be found at &url.mcrypt.iv;, &url.mcrypt.bcm; and in chapter 9.3 of Applied Cryptography by Schneier (ISBN 0-471-11709-9) for a discussion of this topic.