| Patents for G09C 1 - Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system (12,544) |
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| 12/05/1995 | US5473692 Roving software license for a hardware agent |
| 11/22/1995 | EP0682832A1 Protected distribution protocol for keying and certificate material |
| 11/21/1995 | US5469507 Secure communication and computation in an insecure environment |
| 11/16/1995 | WO1995030976A1 Method for the production of a key common to two devices for implementing a common cryptographic procedure and associated apparatus |
| 11/15/1995 | EP0681768A1 A method and apparatus for generating a cipher stream |
| 11/15/1995 | EP0567474B1 Method and apparatus for access control and/or identification |
| 11/14/1995 | US5467398 Method of messaging in a communication system |
| 11/14/1995 | US5467137 Method and apparatus for synchronizing a receiver as for a compressed video signal using differential time code |
| 11/09/1995 | WO1995030292A1 Private signature and proof systems |
| 11/08/1995 | EP0681242A1 Secure access method for removable cards for computers |
| 11/08/1995 | EP0680650A1 Method for secret notation of alphanumerical access codes and device for performing the same. |
| 11/02/1995 | EP0679980A1 Method and apparatus enabling software trial with computer-dependent identification |
| 11/02/1995 | EP0679979A1 Method and apparatus enabling software trial with a try-and-buy user interaction |
| 10/31/1995 | USRE35078 Method and apparatus for encrypting and decrypting time domain signals |
| 10/26/1995 | WO1995028784A1 Computer network cryptographic key distribution system |
| 10/25/1995 | EP0679030A2 Packet program component detector |
| 10/25/1995 | EP0541727A4 Method for secure time-stamping of digital documents |
| 10/19/1995 | WO1995023384A3 Error correctable data transmission method and device based on semi-cyclic codes |
| 10/18/1995 | EP0677939A2 Wireless communications privacy method and system |
| 10/17/1995 | US5459789 Packet TV program component detector |
| 10/11/1995 | EP0676876A1 Encryption method and system |
| 10/11/1995 | EP0676110A1 System and method for key distribution using quantum cryptography. |
| 10/11/1995 | EP0676109A1 Method of extending the validity of a cryptographic certificate |
| 10/10/1995 | US5457748 Method and apparatus for improved security within encrypted communication devices |
| 10/10/1995 | US5457746 System and method for access control for portable data storage media |
| 10/10/1995 | CA2096818C Arrangement for transforming plaintext into ciphertext for use in a data communications system |
| 10/04/1995 | EP0675615A1 Method for the combined authentication of a telecommunications terminal and a user module in a communications network |
| 10/04/1995 | EP0675614A1 Apparatus for the implementation of a system for the secure exchange of data according to the RSA method limited to digital signatures and message verification |
| 09/28/1995 | WO1995026087A1 Apparatus for generating encryption/decryption look-up tables using a session key |
| 09/28/1995 | WO1995026086A1 Data decryption apparatus in a subscription television signal receiving system |
| 09/26/1995 | US5454039 Software-efficient pseudorandom function and the use thereof for encryption |
| 09/23/1995 | CA2156780A1 Apparatus and method for cryptographic system users to obtain a jointly determined, secret, shared and unique bit string |
| 09/20/1995 | EP0673134A2 Pseudo-random number generator, and communication method and apparatus using encrypted text based upon pseudo-random numbers generated by said generator |
| 09/20/1995 | EP0672273A1 Method and apparatus for encryption having a feedback register with selectable taps |
| 09/19/1995 | US5452357 Method and apparatus for access control and/or identification |
| 09/14/1995 | WO1995024708A1 Method and system for transmitting information utilizing zero-knowledge certifying protocol |
| 09/13/1995 | EP0671712A1 Method and device to authenticate a data carrier, intended to approve a transaction or the access to a service or a place; and corresponding data carrier |
| 09/13/1995 | EP0671091A1 Method for key management of point-to-point communications |
| 09/13/1995 | EP0671090A1 Method and apparatus for improved security within encrypted communication devices |
| 09/08/1995 | WO1995024030A1 Encryption template |
| 09/08/1995 | WO1995019672A3 Cryptographic system and method with key escrow feature |
| 09/06/1995 | EP0670645A1 Method for session key generation and updating in a distributed communication network |
| 09/06/1995 | EP0670644A1 Method for secure communication and key distribution in a distributed network |
| 09/05/1995 | US5448668 Method of detecting changes to a collection of digital signals |
| 08/31/1995 | WO1995023465A1 Efficient electronic money |
| 08/31/1995 | WO1995023384A2 Error correctable data transmission method and device based on semi-cyclic codes |
| 08/30/1995 | EP0669064A1 Apparatus and method for providing data security in a computer system having a removable memory |
| 08/23/1995 | EP0668580A1 Method of authenticating a terminal in a transaction execution system |
| 08/23/1995 | EP0667998A1 Method and apparatus for authentication of client server communication |
| 08/16/1995 | EP0667692A2 Public-key cryptographic apparatus handling ciphertext by public-key |
| 08/16/1995 | EP0667691A2 Protected communication method and system |
| 08/15/1995 | US5442705 Hardware arrangement for enciphering bit blocks while renewing a key at each iteration |
| 08/15/1995 | US5442702 Method and apparatus for privacy of traffic behavior on a shared medium network |
| 08/15/1995 | CA2141882A1 Protected communication method and system |
| 08/09/1995 | EP0666694A1 Method and apparatus for controlling access to digital signals |
| 08/08/1995 | US5440640 Multistream encryption system for secure communication |
| 08/02/1995 | EP0665486A2 Method of protecting electronically published materials using cryptographic protocols |
| 07/27/1995 | WO1995020279A1 Apparatus and method for controlling access to and interconnection of computer system resources |
| 07/27/1995 | WO1995020278A1 Pseudo-random generator |
| 07/27/1995 | CA2181926A1 Apparatus and method for controlling access to and interconnection of computer system resources |
| 07/25/1995 | US5436972 Method for preventing inadvertent betrayal by a trustee of escrowed digital secrets |
| 07/20/1995 | WO1995019672A2 Cryptographic system and method with key escrow feature |
| 07/20/1995 | WO1995019668A1 A method and system for audio information dissemination using various transmission modes |
| 07/20/1995 | CA2176032A1 Cryptographic system and method with key escrow feature |
| 07/18/1995 | US5434919 Compact endorsement signature systems |
| 07/12/1995 | EP0662673A2 Anonymous credit card transactions |
| 07/11/1995 | US5432853 Digital signal processing system |
| 07/11/1995 | US5432849 In a data storage system |
| 07/05/1995 | EP0661846A1 Method for authenticating at least one identification device by a verification device using a zero-knowledge protocol |
| 07/05/1995 | EP0661845A2 System and method for message authentication in a non-malleable public-key cryptosystem |
| 07/05/1995 | EP0661844A2 Improvements to security in data processing systems |
| 07/05/1995 | CN1104794A Coding apparatus and discrimination of anti-counterfeit code for calligraphy and painting works |
| 06/29/1995 | WO1995014289A3 Identification/authentication coding method and apparatus |
| 06/28/1995 | EP0660570A2 Method and apparatus for privacy of traffic behavior on a shared medium passive optical network |
| 06/28/1995 | EP0660565A2 A method and network for communicating between a group of entities a text encrypted using an encryption key intrinsic to the group of entities in a network having a plurality of entities and a center |
| 06/28/1995 | EP0660563A1 Apparatus for implementing a symmetric block ciphering algorithm without the complementation property |
| 06/28/1995 | EP0660562A2 Clock frequency modulation for secure microprocessors |
| 06/28/1995 | EP0660275A2 Document copying deterrent method |
| 06/27/1995 | US5428684 Electronic cashless transaction system |
| 06/14/1995 | EP0658022A2 Cryptographic key generation using sequential concatenation |
| 06/14/1995 | EP0658021A1 A method and system for key distribution and authentication in a data communication network |
| 06/14/1995 | DE4342197A1 Storing and decoding device for PIN of card, e.g. credit, telephone |
| 06/13/1995 | US5425101 System and method for simultaneously authorizing multiple virtual channels |
| 06/08/1995 | WO1995015634A1 System and method for transmitting and receiving variable length authorization control for digital services |
| 06/08/1995 | WO1995015633A1 A non-deterministic public key encryption system |
| 06/08/1995 | WO1995015632A1 System and method for simultaneously authorizing multiple virtual channels |
| 06/08/1995 | WO1995015628A1 Apparatus and method for storing data |
| 06/08/1995 | CA2153497A1 Apparatus and method for storing data |
| 06/07/1995 | EP0656708A1 System and method for the transmission and validation of an updated encryption key between two users |
| 06/06/1995 | US5422953 Personal date/time notary device |
| 06/04/1995 | CA2134013A1 Exchange certificate for one way validation of information |
| 05/30/1995 | US5420928 Pseudo-random generator |
| 05/30/1995 | US5420926 Anonymous credit card transactions |
| 05/30/1995 | US5420922 System for the safe transmission of messages |
| 05/26/1995 | WO1995014289A2 Identification/authentication coding method and apparatus |
| 05/24/1995 | EP0654920A2 Method for the efficient updating of the hash value of a data file |
| 05/24/1995 | EP0570388B1 Method, identification device and verification device for identification and/or performing digital signature |
| 05/17/1995 | EP0653695A2 Software pay per use system |
| 05/11/1995 | WO1995012941A1 Method for improved security of crc encryption system |
| 05/11/1995 | WO1995012940A1 Method for automatic resynchronization of the transmitter/receiver pair in a remote keyless entry system |