The present invention provides a computer system comprising a system memory, a processor, a cryptoprogram, an I/O port, and an electronic key. The electronic key can be inserted into and removed from the I/O port and contains a programmable memory that stores passwords. The cryptoprogram is used to encrypt...http://www.google.de/patents/US6618807?utm_source=gb-gplus-sharePatent US6618807 - Computer system with an external and portable electronic key for encryption and decryption processes
