Hi, I want to add encrypt/decrypt functionalities to my protocol. How can I use RSA, AES/DES in ns2? Do I have to write the ciphers myself or can I somehow import them? As far as I know C++ has no such functions in the standard API. Any advice is much appreciated. Best regards _________________________________________________________________ Windows Live™ SkyDrive™: Get 25 GB of free online storage. http://windowslive.com/online/skydrive?ocid=TXT_TAGLM_WL_skydrive_042009