Note that IVs only affect block cipher modes other than ECB mode. ECB mode 
ignores IVs completely.


Titu Kim wrote:

> Hi,
>    I am using libmcrypt-2.5.3 to do encryption in php.
> I use exactly the steps provided in mcrypt_module_open
> available on php website
> I can encrypt and decrypt a string correctly. However,
> if i encrypt a cookie to write to user's browser, the
> decryption is incorrect when i try to decrypt this
> cookie when user comes again. I found out the main
> cause is the function mcrypt_module_open. This
> function return a different resource everytime it is
> called. Eventually it cause the decryption on cookie
> to be incorrect. Can someone give me suggestion on how
> to encrypt and decrypt a cookie?
> Thanks very much.
> Kim
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