Method and means to limit access to computer systems

Method and system for a public key cryptosystem having proactive

Method and system for authenticating a computer network node

Method and system for authentication

Method and system for calculating a user account balance in a re

Method and system for changing an authorization password or key

Method and system for diagnosis and control of machines using co

Method and system for diversification of a basic key and for aut

Method and system for dynamic server document encryption

Method and system for encrypting input from a touch screen

Method and system for establishing a cryptographic key agreement

Method and system for hierarchical key access and recovery

Method and system for key distribution and authentication in a d

Method and system for message delivery utilizing zero knowledge

Method and system for normalizing biometric variations to authen

Method and system for personal identification

Method and system for personal identification using proofs of le

Method and system for proactive password validation

Method and system for processing electronic documents

Method and system for protection of digital information