openPGP (RFC2440) compatible (version 3 and version 4 packets)
Validate keys packets and subpackets
Tied to free RDBMS (postgreSQL)
Interface with programs through standard keyserver interface
Capable of updating previously stored keys
Key caching
Handle key expiration and revocation
Allow users to submit and retrieve keys through web browser
Allow users to submit and retrieve multiple keys as key ring through web browser
Synchronize with other keyservers through HTTP protocol (PKS)