Usage controlling of secret information

Official title: {Usage controlling of secret information, e.g. techniques for restricting cryptographic keys to pre-authorized uses, different access levels, validity of crypto-period, different key- or password length, or different strong and weak cryptographic algorithms (network architectures or network communication protocols for using time-dependent keys in a packet data network H04L63/068)}

H04L9/088 (Usage controlling of secret information) appears on 2,600 US grants and 3,049 published applications in this corpus.