| 6985588 |
System and method for using location identity to control access to digital information |
| Jan-10-2006 |
A method and apparatus for controlling access to digital information utilizes a location identity attribute that defines a specific geographic location. The location identity attribute is associated with... |
| 6980658 |
Method and apparatus for encrypting transmissions in a communication system |
| Dec-27-2005 |
Method and apparatus for encrypting transmission traffic at separate protocol layers L1, L2, and L3so that separate encryption elements can be assigned to separate types of transmission... |
| 6922775 |
User support system for cryptographic communication in network systems |
| Jul-26-2005 |
A user support system for cryptographic communication includes a key storage for storing keys used for deciphering, a deciphering part for deciphering an enciphered communication text into a deciphered... |
| 6895090 |
Pseudo-noise sequence with insertion having variant length and position |
| May-17-2005 |
An augmented pseudo-noise sequence (10) is generated from a two or more pseudo-noise sequences, using LFSRs or other such devices. A segment (16) of a one pseudo-noise sequence (14), having an arbitrary... |
| 6885747 |
Cryptographic key split combiner |
| Apr-26-2005 |
A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce... |
| 6845159 |
Processing method and apparatus for converting information from a first format into a second format |
| Jan-18-2005 |
A data processing method and apparatus are proposed for used in the encryption, decryption and authentication of messages. A memory for storing input information, a set of operations and a processor for... |
| 6823457 |
Method and system for verifying control accesses between a device on a non-proprietary bus and a device on a proprietary bus |
| Nov-23-2004 |
A method for verifying control accesses between a device on a non-proprietary bus and a device on a proprietary bus is disclosed. A gateway controller is connected between a proprietary bus and a non-proprietary... |
| 6807277 |
Secure messaging system with return receipts |
| Oct-19-2004 |
A method and system for electronic messaging in which a sender of an electronic message receives a return receipt, without having to send the message contents to a third party. The sender contacts a server... |
| 6757832 |
Unauthorized modification of values in flash memory |
| Jun-29-2004 |
The invention is a method and system in which an authentication chip having secret information stored within it, including secret data stored in multi-level flash memory, is protected from unauthorised... |
| 6674861 |
Digital audio watermarking using content-adaptive, multiple echo hopping |
| Jan-6-2004 |
A method, an apparatus and a computer program product for adaptive, content-based watermark embedding of a digital audio signal (100) are disclosed. Corresponding watermark extracting techniques are also... |
| 6671377 |
System and method for downloading network information to mobile stations for location calculation |
| Dec-30-2003 |
A telecommunications system and method is disclosed for downloading encrypted network information, such as Base Transceiver Station (BTS) coordinates, in a point-to-point manner between the network and... |
| 6654465 |
Method of implementing a key recovery system |
| Nov-25-2003 |
A method of generating a recovery key encryption key (RKEK) in a secure manner by an integrated circuit (IC) and a key recovery escrow agent includes the steps of generating by the IC a first number having... |
| 6615348 |
Method and apparatus for an adapted digital signature |
| Sep-2-2003 |
A method and apparatus for an authenticated electronic userid comprising an adapted digital signature is provided. According to an aspect of the present invention, the adapted digital signature is generated... |
| 6609197 |
Method and system for secure emergency access to network devices |
| Aug-19-2003 |
Methods and system for providing secure emergency access to network devices. The methods and system described herein can be used to provide secure emergency access to network devices such as routers, telephony... |
| 6608901 |
Cryptographic key split combiner |
| Aug-19-2003 |
A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce... |
| 6606386 |
Cryptographic key split combiner |
| Aug-12-2003 |
A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce... |
| 6560337 |
Systems, methods and computer program products for reducing effective key length of ciphers using one-way cryptographic functions and an initial key |
| May-6-2003 |
Systems, methods and computer program products reduce effective key length of a symmetric key cipher by deriving an intermediate value from an initial key, using a one-way cryptographic function. Predetermined... |
| 6549623 |
Cryptographic key split combiner |
| Apr-15-2003 |
A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce... |
| 6542610 |
Content protection for digital transmission systems |
| Apr-1-2003 |
A method for protecting digital content from copying and/or other misuse as it is transferred between one or more computationally constrained devices over insecure links, includes preliminarily authenticating... |
| 6542608 |
Cryptographic key split combiner |
| Apr-1-2003 |
A cryptographic key split combiner, which includes a number of key split generators for generating cryptographic key splits and a key split randomizer for randomizing the cryptographic key splits to produce... |
| 6526144 |
Data protection system |
| Feb-25-2003 |
A method of communicating from a transmitter to a receiver over a communication medium. For the transmitter, the method includes the step of formatting data into a data stream to be communicated across... |
| 6490685 |
Storage device having testing function and memory testing method |
| Dec-3-2002 |
A flash memory includes an encoded cryptographic key "k" stored therein. A protected ROM, an external access to which is inhibited, includes a decoding program stored therein to decode the cryptographic... |
| 6401207 |
Security device for vehicle |
| Jun-4-2002 |
A security device for vehicle disclosed is of a type generating a seed that is used suitably in order to generate a key by being encoded and that is decreased in regularity. Namely, the security device... |
| 6351814 |
Field programmable gate array with program encryption |
| Feb-26-2002 |
A field programmable gate array (FPGA) and a decryption circuit are implemented within a common integrated circuit (IC) or within separate ICs enclosed within a common IC package. The decryption circuit... |
| 6330333 |
Cryptographic system for wireless communications |
| Dec-11-2001 |
A wireless communications system (110) with increased privacy. The system (110) transmits an encrypted signal between a base station (112) and a wireless terminal (122). In the forward channel, the base... |
| 6278782 |
Method of implementing a key recovery system |
| Aug-21-2001 |
A method of generating a recovery key encryption key (RKEK) in a secure manner by an integrated circuit (IC) and a key recovery escrow agent includes the steps of generating by the IC a first number having... |
| 6278780 |
Method of and an apparatus for generating internal crypto-keys |
| Aug-21-2001 |
To provide a method of generating internal crypto-keys to be set initially in a feedback-shift-registers of a pseudo-random-sequence generator of a stream cipher system with sufficient security and sufficiently... |
| 6263446 |
Method and apparatus for secure distribution of authentication credentials to roaming users |
| Jul-17-2001 |
A roaming user needing an his authentication credential (e.g., private key) to access a computer server to perform an electronic transaction may obtain the authentication credential in an on-demand fashion... |
| 6236728 |
Security apparatus for data transmission with dynamic random encryption |
| May-22-2001 |
A security apparatus including a number input device (302), an address register (312) responsive to the number input device, an encryption schema memory (316) addressable by the address register to produce... |
| 6226750 |
Secure session tracking method and system for client-server environment |
| May-1-2001 |
A method and system for tracking communications in a client-server environment. The method includes the steps of sending a first request from the client to the server over a first connection, sending a... |
| 6185686 |
Computer system and process for accessing an encrypted and self-decrypting digital information product while restricting access to decrypted digital information |
| Feb-6-2001 |
Some of these problems with digital information protection systems may be overcome by providing a mechanism which allows a content provider to encrypt digital information without requiring either a hardware... |
| 6167514 |
Method, apparatus, system and information storage medium for wireless communication |
| Dec-26-2000 |
Wireless communication method and apparatus which can perform the wireless transmission/reception of encrypted data without previous provision of a cryptographic key and without any system for registering... |
| 6154840 |
System and method for transferring encrypted sections of documents across a computer network |
| Nov-28-2000 |
A system and method for transmitting encrypted documents from a document server to a client computer across network allows a user to select and view fewer than all of the sections of the document so that... |
| 6141752 |
Mechanism for facilitating secure storage and retrieval of information on a smart card by an internet service provider using various network computer client devices |
| Oct-31-2000 |
A network computer client device (NC) maintains a root internet service provider (ISP) certificate which includes the ISP's public key and which is digitally signed by a root authority using the root authority's... |
| 6089460 |
Semiconductor device with security protection function, ciphering and deciphering method thereof, and storage medium for storing software therefor |
| Jul-18-2000 |
A semiconductor device is provided with a data security protection function. A ciphering program is given from a control device to a logic-changeable logical circuit. The logical circuit changes its logic... |
| 6064740 |
Method and apparatus for masking modulo exponentiation calculations in an integrated circuit |
| May-16-2000 |
Circuitry which performs modular mathematics to solve the equation C=M.sup.k mod n and n is performed in a manner to mask the exponent k's signature from timing or power monitoring attacks. The modular... |
| 6049873 |
Scrambled information transmitting and receiving method |
| Apr-11-2000 |
A service information receiving apparatus (1) for receiving scrambled charged service information transmitted as being multiplexed on an FM broadcast radio wave from an FM broadcasting station (3) causes... |
| 6014442 |
Decrypting method and electronic device |
| Jan-11-2000 |
PID information and TSC information are extracted from a header of received data inputted to a terminal 1 and are supplied to an IDT (16). The IDT (16) receives these information and searches a data key... |
| 5809147 |
Device for cryptographically processing data packets and method of generating cryptographic processing data |
| Sep-15-1998 |
A device for encrypting or decrypting data packets. The device includes two cryptographic elements. The first cryptographic element generates processing data, based on a first starting value, for use in... |
| 5586185 |
Communications system capable of communicating encrypted information |
| Dec-17-1996 |
A communications system for transmitting and receiving information encrypted by a cipher key to and from a remote communication apparatus includes a cipher key storage device for storing a cipher key table... |
| 5301235 |
Arrangement for transforming plaintext into ciphertext for use in a data communications system |
| Apr-5-1994 |
A hardware arrangement is provided for transforming plaintext into corresponding ciphertext. The plaintext includes a plurality of words each having a predetermined bit length. The hardware arrangement... |
| 5261003 |
Data communication system and method with data scrambling |
| Nov-9-1993 |
Data communication system and method with a data scrambling with high security. A data scrambling part is provided with a extended key memory for storing addresses of extended keys, and one of the extended... |
| 5253294 |
Secure transmission system |
| Oct-12-1993 |
In a secure digital transmission system that may utilize the Data Encryption Standard, the message signal is encrypted according to a predetermined algorithm and a key. The key is selected from a library... |
| 5199074 |
Encryption system |
| Mar-30-1993 |
A communication system transmits and receives encrypted digital signal samples. The system includes a generator for generating digital signal samples to be encrypted and an encryption memory for storing... |
| 5016275 |
Buffered encryption/decryption |
| May-14-1991 |
Encryption and decryption mechanisms at transmitters and receivers, respectively, have applied thereto encryption or decryption keys and initializing values. These mechanisms generate cryptographic bit... |
| 5008935 |
Efficient method for encrypting superblocks of data |
| Apr-16-1991 |
This invention relates to an arrangement for encrypting data for storage in a computer and/or for transmission to another data processing system. The plain text data is divided into buffers and the buffers... |
| 5003596 |
Method of cryptographically transforming electronic digital data from one form to another |
| Mar-26-1991 |
A cryptographic system creates a key table from a single key such that the relationship between the keys in the key table cannot be determined even if the system implementation is known. The system uses... |
| 4972481 |
Ciphering and deciphering device |
| Nov-20-1990 |
A ciphering system comprises a ciphering device having an input for a sequence of bits to be ciphered, and output for the ciphered bit sequence, and a mixing unit connected between the input and the output.... |
| 4914697 |
Cryptographic method and apparatus with electronically redefinable algorithm |
| Apr-3-1990 |
A cryptographic apparatus for encrypting and decrypting digital words includes a mechanism that permits a cipher algorithm to be electronically stored after the manufacture of the apparatus. The storing... |
| 4791669 |
Encryption/decryption system |
| Dec-13-1988 |
An encryption/decryption system for a communication channel increases the number of values for the encryption key variable without increasing the length of a cipher feedback register. This is done by providing... |
