| 5664017 |
Internationally regulated system for one to one cryptographic communications with national sovereignty without key escrow |
| Sep-2-1997 |
An encryption method and apparatus for generating an encrypted message which is controllably decryptable, comprising providing at least one agency public key to at least one decrypting agency entity respectively... |
| 5640454 |
System and method for access field verification |
| Jun-17-1997 |
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... |
| 5633929 |
Cryptographic key escrow system having reduced vulnerability to harvesting attacks |
| May-27-1997 |
A public key escrow system is adapted to have a proof of knowledge protocol for a certificate. The certificate is signed with RSA and is proved using a protocol based on the Guillou-Quisquater proof of... |
| 5633928 |
Key escrow method with warrant bounds |
| May-27-1997 |
A key escrow technique is disclosed which permits cryptographic limits on wiretapping warrants. Specifically, time limits on wiretaps may be enforced. In addition, the wiretapper is targeted to a specific... |
| 5631961 |
Device for and method of cryptography that allows third party access |
| May-20-1997 |
A device for and method of transmitting an encrypted message and an access field from a sender to a receiver, where a third party may intercept and process the transmission. The sender and receiver agree... |
| 5625692 |
Method and system for a public key cryptosystem having proactive, robust, and recoverable distributed threshold secret sharing |
| Apr-29-1997 |
A proactive threshold secret sharing cryptosystem using a set of servers. The cryptosystem is a threshold cryptosystem, in the sense that service is maintained if at least (k+1) out of n servers are active... |
| 5623546 |
Encryption method and system for portable data |
| Apr-22-1997 |
A system and method allows portable, encrypted data to be accessible through multiple hosts, including new hosts (14), without requiring a secure link to the new hosts. A split key encryption system encrypts... |
| 5610982 |
Compact certification with threshold signatures |
| Mar-11-1997 |
Certifying data includes having a subgroup of authorities each contribute a partial digital signature of the data to enable computation of a combined signature where the subgroup includes some, but not... |
| 5564106 |
Method for providing blind access to an encryption key |
| Oct-8-1996 |
Blind access (100, 300, 400) to a desired encryption key of a predetermined first group member is provided to a second group. The first group encrypts a plurality of first group member encryption keys... |
| 5557765 |
System and method for data recovery |
| Sep-17-1996 |
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... |
| 5557346 |
System and method for key escrow encryption |
| Sep-17-1996 |
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... |
| 5553145 |
Simultaneous electronic transactions with visible trusted parties |
| Sep-3-1996 |
A number of electronic communications methods are described involving a first and a second party, with assistance from at least a trusted party, enabling electronic transactions in which the first party... |
| 5519778 |
Method for enabling users of a cryptosystem to generate and use a private pair key for enciphering communications between the users |
| May-21-1996 |
The present invention describes a method for enabling users of a cryptosystem to agree on secret keys. In one embodiment, a trusted agent chooses at least one individual key for each user, with at least... |
| 5513261 |
Key management scheme for use with electronic cards |
| Apr-30-1996 |
In an electronic card of the type for insertion into a host electronic device for providing to the host device security parameters pertaining to the rightful holder of the card, the security parameters... |
| 5481613 |
Computer network cryptographic key distribution system |
| Jan-2-1996 |
Novel cryptographic key distribution techniques to be used in large computer networks are disclosed. The techniques require trusted key release agent systems in each security domain. The encryptor of a... |
| 5436972 |
Method for preventing inadvertent betrayal by a trustee of escrowed digital secrets |
| Jul-25-1995 |
The invention employs a voluntary identification/definition phase performed, for example, shortly after a computer is purchased, and a secret information retrieval phase. In the definition phase, the true... |
| 5420927 |
Method for certifying public keys in a digital signature scheme |
| May-30-1995 |
A method for certifying public keys of a digital signature scheme in a secure communications system is provided. The secure communications system in one in which there are authorities with previously-certified... |
| 5315658 |
Fair cryptosystems and methods of use |
| May-24-1994 |
A method, using a public-key cryptosystem, for enabling a predetermined entity to monitor communications of users suspected of unlawful activities while protecting the privacy of law-abiding users, wherein... |
| 5301231 |
User defined function facility |
| Apr-5-1994 |
In a cryptographic module, a User Defined Function (UDF) facility is provided which provides users with the capability of defining and creating custom functions to meet their cryptographic processing needs.... |
| 5276737 |
Fair cryptosystems and methods of use |
| Jan-4-1994 |
A method, using a public-key cryptosystem, for enabling a predetermined entity to monitor communications of users suspected of unlawful activities while protecting the privacy of law-abiding users, wherein... |
| 5241597 |
Method for recovering from encryption key variable loss |
| Aug-31-1993 |
A method for recovering from encryption key variable loss, either inadvertent or the result of tampering. A predetermined key encryption key is encrypted with itself at the time when keys are first loaded,... |
| 4969188 |
Process and apparatus for the protection of secret elements in a network of encrypting devices with open key management |
| Nov-6-1990 |
Each encryption device of a communication network is divided into a base part and a security module in credit card form. The security module contains the functional stages required for the coding/decoding... |
| 4941176 |
Secure management of keys using control vectors |
| Jul-10-1990 |
The invention is an apparatus and method for validating that key management functions requested for a cryptographic key by the program have been authorized by the originator of the key. The invention includes... |
