* Encrypt the message generating a new iv (generated by the client).

Real Message: "The life is good!"
Encrypted Message: c~n+` Neaw
Iv: @

* Decrypt the message.

Decrypted Message: "The life is good!"

* Encrypt the message using an especific iv (sent by client).

Real Message: "I feel nice!"
Encrypted Message: ~>T?{f]
Iv: @

* Decrypt the message with the already known iv.

Decrypted Message: "I feel nice!"