une capture réseau ...

AES
example utilisation pycrypto https://codeghar.wordpress.com/2011/09/01/aes-encryption-with-python/
wrappers openssl: python-m2crypto, ncrypt (https://pypi.python.org/pypi/ncrypt)
implémentations en python: https://github.com/caller9/pythonaes/tree/master/aespython , https://code.google.com/p/slowaes/source/browse/trunk/python/aes.py
fun http://www.formaestudio.com/rijndaelinspector/

pense-bête scapy et python
http://wiki.spiritofhack.net/index.php/Scapy-usage
http://www.tutorialspoint.com/python/python_basic_operators.htm