HP Sa3110 - VPN Server Appliance Manual page 32

Cryptographic Systems and Encryption Terminology
Crypto Period Crypto Period
Crypto Period Crypto Period
Related Related Related Related
Information Information
Information Information
2-12
A crypto period defines how long a session key is actually used.
Key lifetimes (crypto-periods) affect encryption strength
because the longer the same session key is used the greater the
chance that it is compromised. Additionally, the more data that
is secured with a given key, the greater the loss if the key is
compromised.
Long crypto-periods (key lives) also provide more ammunition
for an adversary to break the key since the adversary potentially
has access to significantly more data to work with. Finally, the
longer a key is in use, the greater the temptation to break the
keys since breaking the key provides the adversary with access
to significantly more valuable data.
Triple Pass DES (page 2-5)
3DES (page 2-7)
Packet Keys (page 3-8)
Hewlett-Packard Company Virtual Private Networking Concepts Guide