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| Number | Title | Issue Date |
| 5819275 | System and method for superimposing attributes on hierarchically organized file systems A method for superimposing attributes on files stored in a hierarchically organized file system, having at least one file and at least one directory, is disclosed. The method initializes an attribute data base (ADB) with one or more entries having a path ... | 10/06/1998 |
| 5745573 | System and method for controlling access to a user secret A system and method for data escrow cryptography are described. An encrypting user encrypts a message using a secret storage key (KS) and attaches a data recovery field (DRF), including an access rule index (ARI) and KS, to the encrypted message. The DRF ... | 04/28/1998 |
| 5640454 | System and method for access field verification A cryptographic communications system and method is provided for access field verification. A key exchange field which includes an encryption of at least part of a first encryption key using a public portion of a second encryption key, an access field whi... | 06/17/1997 |
| 5557765 | System and method for data recovery A system and method for dam escrow cryptography are described. An encrypting user encrypts a message using a secret storage key (KS) and attaches a data recovery field (DRF), including an access rule index (ARI) and KS, to the encrypted message. The DRF a... | 09/17/1996 |
| 5557346 | System and method for key escrow encryption A system and method for key escrow cryptography for use in a system comprising a sender and a receiver. Only public escrow keys are stored in the sender and the receiver. The sender encrypts a message using a secret session key (KS), and generates a leaf ... | 09/17/1996 |
| 5361359 | System and method for controlling the use of a computer A system and method for auditing and controlling the use of a computer. An operating system and selected programs and data , referred to as approved applications and approved data , are stored on a protected media which cannot be modified by any ordinary ... | 11/01/1994 |
