| 7043017 |
Key stream cipher device |
| May-9-2006 |
A symmetric key stream processor 60 that encrypts and decrypts text in accordance with the RC4 algorithm has a main processing block 62 and a host interface 64. The main processing block 62 includes an... |
| 7039185 |
Method and system for securing a printhead in a closed system metering device |
| May-2-2006 |
A closed system meter that secures the link between the accounting device and printer utilizing a Linear Feedback Shift Register (LFSR) based stream encryption is provided. The accounting device includes... |
| 7023992 |
Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device |
| Apr-4-2006 |
In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets,... |
| 7016498 |
Encrypting a digital object on a key ID selected therefor |
| Mar-21-2006 |
To encrypt a digital object, a key ID is selected for the digital object, and a function ƒ( ) having an input and an output is selected. The selected key ID is then employed as the input to the function... |
| 7006634 |
Hardware-based encryption/decryption employing dual ported key storage |
| Feb-28-2006 |
A system for the encryption and decryption of data employing dual ported RAM for key storage to accelerate data processing operations. The on-chip key storage includes a dual-ported memory device which... |
| 7006629 |
Method and system for processing a data set |
| Feb-28-2006 |
A method and system for processing a data set. More particularly, the present invention provides a method and system for encrypting or decrypting a data set so that the data set remains entirely in the... |
| 7006627 |
Cipher block chaining mode in encryption/decryption processing |
| Feb-28-2006 |
A data encryption/decryption circuit is presented that can be implemented in a field programmable gate array. First and second logic components are provided which are controlled by first and second control... |
| 7003107 |
Hybrid stream cipher |
| Feb-21-2006 |
In one embodiment, a hybrid stream cipher operating within a computing device. The hybrid stream cipher comprises at least two software routines. A first routine is responsible for dividing incoming plain... |
| 7000119 |
Instruction/data protection employing derived obscuring instruction/data |
| Feb-14-2006 |
A method and apparatus are described for protecting critical computer software and/or data with a large amount of obscuring instructions and or data to the extent that observing and understanding the obscured... |
| 6973187 |
Block encryption method and schemes for data confidentiality and integrity protection |
| Dec-6-2005 |
A block encryption method and schemes (modes of operation) that provide both data confidentiality and integrity with a single cryptographic primitive and a single processing pass over the input plaintext... |
| 6954740 |
Action verification system using central verification authority |
| Oct-11-2005 |
Architecture for central e-commerce authorization and verification using multiple Keys/Pins storage and central action verification means. Action Verification is provided between Action Initiating Party... |
| 6952822 |
Program installation method, program installation system, program executing apparatus, and storage medium |
| Oct-4-2005 |
The installation method makes possible the installation of new programs, while maintaining security, in a system LSI device. The installation method comprises a step for receiving the signature data 7... |
| 6951029 |
Security device managed access to information |
| Sep-27-2005 |
In an information delivery system, a security device (SD) manages an access to information (INF). The security device (SD) is capable of providing a pointer (PO) which indicates a location (LO) from which... |
| 6950517 |
Efficient encryption and authentication for data processing systems |
| Sep-27-2005 |
Methods and apparatus are presented herein for encrypting and authentication data, such that some of data can be transmitted in the clear but still be authenticated by the sender. A set of cleartext positions... |
| 6947556 |
Secure data storage and retrieval with key management and user authentication |
| Sep-20-2005 |
Methods, systems and computer program products are provided which provide for controlling access to digital data in a file by encrypting the data with a first key, encrypting the first key with a second... |
| 6947558 |
Stream cipher having a shuffle network combiner function |
| Sep-20-2005 |
A stream cipher is provided with one or more data bit generators to generate a first, second and third set of data bits. The stream cipher is further provided with a combiner function having a network... |
| 6931132 |
Secure wireless local or metropolitan area network and related methods |
| Aug-16-2005 |
A secure wireless local or metropolitan area network and data communications device therefor are provided, where the device transmits plain text in an encrypted message including cipher text and an initialization... |
| 6931128 |
Methods and systems for generating encryption keys using random bit generators |
| Aug-16-2005 |
A security key, such as an encryption key, is generated so as to make it more difficult for eavesdroppers to identify the key. Specifically, a cryptographically secure random number generator generates... |
| 6912658 |
Hiding of encrypted data |
| Jun-28-2005 |
A method of data hiding includes providing a message (68), providing an encrypting sequence (86), and generating an encrypted message (72) based on the message and the encrypting sequence. A carrier signal... |
| 6912284 |
Self-Authenticating cryptographic apparatus |
| Jun-28-2005 |
A self-authenticating apparatus for effecting secure communication of a binary signal. In the encipherment apparatus, key is generated as a function of plain text summed with a pseudorandom linear sequence.... |
| 6886098 |
Systems and methods for compression of key sets having multiple keys |
| Apr-26-2005 |
Systems, methods and a modulated data signal are described herein that provide an efficient way to derive a single key from which a user can extract virtually any number of data encryption keys. A database... |
| 6876746 |
Encryption/decryption engine for multiple isochronous data streams |
| Apr-5-2005 |
Buffers, or registers, are used at one or more places between processing stages in a device for decrypting a data stream. The device has multiple processing stages arranged in a circular manner so that... |
| 6862354 |
Stream cipher encryption method and apparatus that can efficiently seek to arbitrary locations in a key stream |
| Mar-1-2005 |
A stream cipher encryption method and apparatus that can efficiently seek to arbitrary location in a keystream, and a method of generating an arbitrary segment of keystream. |
| 6819764 |
Data processor, communication system and recording medium |
| Nov-16-2004 |
There is provided a data processor wherein a plain text is encrypted to a cipher text by using a encryption key and/or a cipher text is decrypted to a plain text by using a decryption key, which device... |
| 6816596 |
Encrypting a digital object based on a key ID selected therefor |
| Nov-9-2004 |
To encrypt a digital object, a key ID is selected for the digital object, and a function .function.( ) having an input and an output is selected. The selected key ID is then employed as the input to the... |
| 6792108 |
Aperiodic encryption for digital data |
| Sep-14-2004 |
For stream or block ciphers, a sequence generator using a quasi-crystal function is used to prepare an encryption or decryption pad. Various techniques for generating purely aperiodic sequences using quasi-crystal... |
| 6778587 |
Spread spectrum modulation system and method for embedding digital information into digital or analog media |
| Aug-17-2004 |
A system and method for embedding information into digital media and later detecting the embedded information using a unique spread spectrum modulation technique. In general, the present invention removes... |
| 6772343 |
Data processor, communication system and recording medium |
| Aug-3-2004 |
There is provided a data processor in which a plain text or a cipher text is segmented into two or more small blocks, the small blocks are each data-processed one small block as a unit to transform to... |
| 6766024 |
Data communication system |
| Jul-20-2004 |
A system for decrypting an encrypted message comprises first and second decryption devices, the first decryption device having a higher security than the second decryption device. The system further comprises... |
| 6754824 |
Modulated message authentication system and method |
| Jun-22-2004 |
A telecommunications system and method is disclosed for implementing a message authentication code (MAC) for transmitted digital information signals. Digital information signals typically include an error... |
| 6707914 |
System and method for encrypting information within a communications network |
| Mar-16-2004 |
Within a communications system, first and second end stations coupled to a network participate in a communications session with one another using the network. Each end station includes an encryptor having... |
| 6683958 |
Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation |
| Jan-27-2004 |
Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time, frequency... |
| 6615353 |
User authentication method and user authentication system |
| Sep-2-2003 |
A user authentication method and system which maintains reliable security using a low cost storage medium in place of cryptocards, wherein the system comprises control equipment and an operating section... |
| 6560338 |
Limiting delays associated with the generation of encryption stream ciphers |
| May-6-2003 |
A method and an apparatus for generating encryption stream ciphers are based on a recurrence relation designed to operate over finite fields larger than GF(2). A non-linear output can be obtained by using... |
| 6549622 |
System and method for a fast hardware implementation of RC4 |
| Apr-15-2003 |
The system and method of the present invention facilitates encrypting and decrypting files using a fast hardware implementation of the RC4 method to enable secure access to information resources in a computer... |
| 6526508 |
Source authentication of download information in a conditional access system |
| Feb-25-2003 |
A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units... |
| 6490354 |
Lightweight word-oriented technique for generating a pseudo-random sequence for use in a keystream of a stream cipher |
| Dec-3-2002 |
A word-oriented technique for generating a pseudo-random sequence, e.g., a keystream (17) for use in a stream cipher. Specifically, the technique utilizes two different arrays (653, 657) with each array... |
| 6445794 |
System and method for synchronizing one time pad encryption keys for secure communication and access control |
| Sep-3-2002 |
A method for generating an identical electronic one-time pad at a first location and a second location, the method comprising the steps of: (a) providing a first electronic device at the first location... |
| 6438230 |
Data mapping method and apparatus with multi-party capability |
| Aug-20-2002 |
Mapping or encryption of a message made up of characters from a character set is provided. Each character in the character set is associated with one or more disjoint real number intervals. Each character... |
| 6427012 |
Apparatus and method for embedding and extracting information in analog signals using replica modulation |
| Jul-30-2002 |
Apparatus and methods are provided for embedding or encoding auxiliary signals into an analog host or cover signal. A replica of the cover signal or a portion of the cover signal in a particular domain... |
| 6393128 |
System for broadcasting data signals in a secure manner |
| May-21-2002 |
A system for broadcasting data signals in a secure manner comprises means for encrypting the data signals using a first key, means for broadcasting the encrypted data signals to subscribers, means for... |
| 6393125 |
Initializer for a confusion data generator |
| May-21-2002 |
A method and apparatus for the initialization of a class of non-linear confusion data generators is especially useful to enhance the security of non-linear confusion data generators that are restricted... |
| 6373950 |
System, method and article of manufacture for transmitting messages within messages utilizing an extensible, flexible architecture |
| Apr-16-2002 |
Secure transmission of data is provided between a plurality of computer systems over a public communication system, such as the Internet. Secure transmission of data is provided from a customer computer... |
| 6363427 |
Method and apparatus for a bulletin board system |
| Mar-26-2002 |
A method of electronic message exchange comprises reading other identifications of other personal data areas on other servers, reading from the other personal data areas other message identifications identifying... |
| 6343214 |
Mobile telephones |
| Jan-29-2002 |
A mobile telephone comprises reception means (5) for receiving message data including identity data, key data and instruction data from a caller, the identity data relating to the caller and the key data... |
| 6324287 |
Pad encryption method and software |
| Nov-27-2001 |
A pad encryption software architecture includes space on a floppy for storing the pad to be used with the encryption software. The pad is XOR generated with random numbers subject to redetermined offsets.... |
| 6307937 |
Method and apparatus for an adapter card providing conditional access in a communication system |
| Oct-23-2001 |
A method and apparatus for an adapter card, for use in a computer, to provide conditional access by the computer to incoming data streams while maintaining the security of information by maintaining a... |
| 6301361 |
Encoding and decoding information using randomization with an alphabet of high dimensionality |
| Oct-9-2001 |
A method for encoding a set of initial symbols from a plurality of elemental symbols. The method generates for each symbol from the set of initial symbols, a first parameter representing a number of intervals... |
| 6295590 |
Semiconductor memory apparatus having a protecting circuit |
| Sep-25-2001 |
A semiconductor memory incorporates a protecting circuit which causes data, stored in a memory portion, to be output by executing a key canceling sequence from an external apparatus. The data stored in... |
| 6282291 |
Method and apparatus for encrypting input bit sequence |
| Aug-28-2001 |
An output bit sequences is derived from an initial bit sequence and this output bit sequence is used to encrypt an input bit sequence in a first mode of operation or not to so encrypt the input bit sequence... |
