Patents
Sitemap › G09 - Educating; Cryptography; Display; Advertising; Seals › G09C - Ciphering or deciphering apparatus for cryptographic or other purposes involving the need for secrecy › 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
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)
10/1998
10/01/1998WO1998043427A1 Broadcast and reception system, and receiver/decoder and remote controller therefor
10/01/1998WO1998043426A1 Broadcast and reception system, and conditional access system therefor
10/01/1998WO1998043425A1 Smartcard for use with a receiver of encrypted broadcast signals, and receiver
10/01/1998WO1998043421A1 Broadcast receiving system comprising a computer and a decoder
10/01/1998WO1998043415A1 Extracting data sections from a transmitted data stream
10/01/1998WO1998043248A1 Computer memory organization
10/01/1998WO1998043172A2 Access control system
10/01/1998WO1998043167A1 Computer memory organization
10/01/1998WO1998043165A1 Television or radio control system development
10/01/1998WO1998043162A1 Downloading a computer file from a transmitter via a receiver/decoder to a computer
10/01/1998CA2284867A1 Access control system
10/01/1998CA2284147A1 Downloading a computer file from a transmitter via a receiver/decoder to a computer
10/01/1998CA2284146A1 Computer memory organization
10/01/1998CA2284145A1 Method of and apparatus for transmitting data for interactive tv applications
10/01/1998CA2284044A1 Computer memory organization
10/01/1998CA2284036A1 Method and apparatus for preventing fraudulent access in a conditional access system
10/01/1998CA2284022A1 Television or radio control system development
10/01/1998CA2284016A1 Signal generation and broadcasting
10/01/1998CA2284014A1 Smartcard for use with a receiver of encrypted broadcast signals, and receiver
10/01/1998CA2284011A1 Data processing system
09/1998
09/30/1998EP0867843A2 System and method for authentication, and device and method for autentication
09/30/1998EP0867084A1 Tame automorphism public key system
09/29/1998CA2141997C Public-key cryptographic apparatus handling ciphertext by public-key
09/28/1998CA2232253A1 High speed modular exponentiator
09/23/1998EP0866616A1 Method of and apparatus for transmitting data
09/23/1998EP0866613A1 Preventing fraudulent access in a conditional access system
09/23/1998EP0866611A1 Broadcast receiving system comprising a computer and a decoder
09/23/1998CN1194072A Parameterized hash functions for access control
09/23/1998CN1194050A Value transfer system
09/22/1998US5812669 Method and system for providing secure EDI over an open network
09/22/1998US5812666 Cryptographic key management and validation system
09/22/1998US5812661 Software reproduction apparatus
09/22/1998US5812398 Method executed in a computer system
09/22/1998CA2146439C Method and apparatus for encryption having a feedback register with selectable taps
09/17/1998WO1998040984A1 Method of and apparatus for encrypting signals for transmission
09/16/1998EP0865009A2 Electronic transaction processing system
09/16/1998EP0865007A2 Terminal device and transaction system using electronic money
09/16/1998EP0864959A2 Data management system
09/16/1998EP0864124A1 An improved pseudo-random generator
09/16/1998EP0755598B1 Computer network cryptographic key distribution system
09/16/1998CN1193151A IC card system and method for making IC card system safety
09/15/1998CA2123456C Document authentication system utilizing a transparent label
09/09/1998EP0863505A2 Method for superimposing and detecting additional information signal, method for detecting additional information signal, device for detecting additional information signal, and device for recording information signal
09/09/1998EP0862824A1 Remote-auditing of computer generated outcomes using cryptographic and other protocols
09/09/1998EP0862769A2 Method, apparatus, system and firmware for secure transactions
09/09/1998CN1192834A Multi-step digital signature method and system
09/09/1998CN1192814A Protection of softward against use without permit
09/03/1998WO1998038767A1 Method and arrangement for computer assisted formation of a permutation to permute digital signals and method and arrangement to encrypt digital signals
09/02/1998EP0862149A2 IC card system and method for securing the system
09/02/1998EP0862105A2 Method of and apparatus for providing secure distributed directory services and public key infrastructure
09/02/1998EP0861540A1 Apparatus and method for encrypting mpeg packets
09/02/1998EP0861539A1 Efficient cryptographic hash functions and methods for amplifying the security of hash functions and pseudo-random functions
09/02/1998EP0861461A2 Systems and methods for secure transaction management and electronic rights protection
08/1998
08/28/1998CA2230304A1 Method of and apparatus for providing secure distributed directory services and public key infrastructure
08/27/1998WO1998037663A1 Method for authorization check
08/27/1998WO1998037662A1 Cryptographic system comprising a ciphering and deciphering system and a key escrow system and associated appliances and devices
08/27/1998WO1998037655A1 Method and system for processing electronic documents
08/27/1998WO1998026385A3 Reliance server for electronic transaction system
08/27/1998CA2280952A1 Cryptographic system comprising a ciphering and deciphering system and a key escrow system and associated appliances and devices
08/26/1998EP0860064A2 Parameterized hash functions for access control
08/26/1998EP0472714B1 Process for authenticating a user using a data station
08/26/1998CN1191643A System and method for access control for data storage media
08/25/1998US5799088 Non-deterministic public key encrypton system
08/25/1998US5799086 Enhanced cryptographic system and method with key escrow feature
08/25/1998CA2076252C Cryptographic protocol for secure communications
08/20/1998WO1998036577A1 Predictive coding method and decoding method for dynamic image
08/20/1998WO1998036527A1 Authentication system, authentication device, authentication data producing device, and authentication method
08/20/1998WO1998036526A1 Cyclotomic polynomial construction of discrete logarithm cryptosystems over finite fields
08/19/1998EP0858701A1 Cryptographic methods for demonstrating satisfiable formulas from propositional logic
08/19/1998EP0858697A1 Computerized payment system for purchasing goods and services on the internet
08/19/1998EP0858354A1 Bio-active frequency generator and method
08/19/1998EP0750813A4 Data decryption apparatus in a subscription television signal receiving system
08/19/1998CN1190830A Circuit for producing pseudorandom number and its application in data communication system
08/18/1998US5796943 Communication apparatus
08/18/1998US5796836 Scalable key agile cryptography
08/18/1998US5796832 Wireless transaction and information system
08/18/1998US5796830 Interoperable cryptographic key recovery system
08/18/1998US5796828 Controlled-access broadcast signal receiving system
08/18/1998US5796824 Storage medium for preventing an irregular use by a third party
08/18/1998CA2133237C Software pay-per-use system
08/18/1998CA2010450C Method for encrypting transmitted data using a unique key
08/13/1998WO1998035467A1 A method of using transient faults to verify the security of a cryptosystem
08/13/1998CA2278754A1 A method of using transient faults to verify the security of a cryptosystem
08/12/1998EP0858186A2 Method for secure communication in a telecommunication system
08/12/1998CN1190515A Videophone interactive mailbox facility system and method of processing information
08/11/1998CA2133200C A cryptographic communications method and system
08/11/1998CA2088371C Method for secure time-stamping of digital documents
08/06/1998WO1998034373A1 Process for generating a digital signature and process for checking the signature
08/06/1998WO1998034372A1 Method for encrypting information represented as a numerical value
08/06/1998DE19703929A1 Verfahren zum Generieren einer digitalen Signatur und Verfahren zur Überprüfung der Signatur A method for generating a digital signature and method for verifying the signature
08/06/1998DE19703928A1 Verfahren zum Verschlüsseln einer als Zahlenwert dargestellten Nachricht A method of encrypting a message represented as a numerical value
08/05/1998EP0856818A2 Apparatus and method for accessing secured data stored in a portable data carrier
08/05/1998EP0856225A1 Encryption and decryption of multi-media data
08/05/1998CN1189949A Use of an encryption server for encrypting messages
08/04/1998US5790675 Cryptographic communication process
08/04/1998US5790666 Decryptor
07/1998
07/29/1998EP0855815A2 Certification of cryptographic keys for chipcards
07/29/1998EP0855685A2 An electronic lottery system and its operating method and computer-readable recording medium in which the electronic lottery program code is stored
07/29/1998EP0855642A2 Pseudorandom number generation circuit and data communication system employing the same
07/29/1998EP0855052A1 Protection of software against use without permit
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