Randomness of random in Cisco ASA

ePrint Report: Randomness of random in Cisco ASA

Ryad Benadjila, Arnaud Ebalard

It all started with ECDSA nonces and keys duplications in a large amount of X.509 certificates generated by Cisco ASA security gateways, detected through TLS campaigns analysis.


After some statistics and blackbox keys recovery, it continued by analyzing multiple firmwares for those hardware devices and virtual appliances to unveil the root causes of these collisions. It ended up with keygens to recover RSA keys, ECDSA keys and signatures …

analysis asa campaigns certificates cisco cisco asa ecdsa eprint report generated keys large random randomness recovery report security statistics tls