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5901227 |
Method and apparatus for implementing partial and complete optional key escrow
A key escrow technique reliably notifies an encrypting principal about escrow authorities requiring access to a secret key used to encrypt information and, further, about how much of that key is...
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5898782 |
Method and system to secure the transmission of data elements between a sensor and a recorder
Disclosed are a method and a system for the securing of the transmission of data elements between a sensor delivering pulses and a recorder processing these pulses. This method and system are...
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5898781 |
Distributed cryptographic object method
A system for increasing the security of a computer system, while giving an individual user a large amount of flexibility and power. To give users the most power and flexibility, a standard object...
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5894519 |
Process for the dissimulaton of a secret code in a data authentication device
A process for the dissimulation of concealment of a secret code in a data authentication device by encrypting the secret code by an encrypting function for forming an image of the secret code and...
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5892775 |
Method and apparatus for providing error-tolerant storage of information
The device and method according to the present invention permute the order of signals representing information intended for storage in a memory. The signal ordering is permuted prior to or at the...
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5892829 |
Method and apparatus for generating secure hash functions
A secure hash function according to the present invention uses a stretch function 202 and a compression function 202 to provide a secure hash value. A stretch function is a function which increases...
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5889861 |
Identity confidentiality method in radio communication system
The radio communication system has at least one first radio station such as a base station and a plurality of second radio stations such as mobile stations. The base station at least possesses a...
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5881153 |
Remote keyless entry encryption algorithm
The present invention teaches a method and system of encrypting a set of data having a test bit. The method comprises the step of generating a first and a second data string from the set of data....
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5870478 |
Modular exponentiation calculation apparatus and method
In the modular exponentiation calculation apparatus of the present invention, a computer calculates a modular exponentiation C=M E modN (M,N: integral number, E: exponent expressed in base m, C:...
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5870470 |
Method and apparatus for encrypting long blocks using a short-block encryption procedure
A system for encrypting a plaintext block using a block encryption algorithm having a block size smaller than that of the plaintext block. The plaintext block is transformed into a masked plaintext...
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5867412 |
Modular multiplication device for information security
The present invention relates to a modular multiplication device for information security which needs only the hardware almost half as much as required in a conventional modular multiplication...
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5862224 |
Cryptographic process for protection against fraud
A cryptographic process is for protection against fraud. An allocation of a secret key K is made to a card and to an application and an input value R is defined. The card and application calculate...
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5859913 |
Method and system for the high-speed generation and transmission of a sequence of characters by means of voice frequencies
Disclosed is a method enabling the generation, by means of voice frequencies, of a sequence of several characters and the high-speed transmission of these characters. This method comprises the step...
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5859912 |
Digital information privacy system
A system for determining a maximum length digital sequence is constructed by selecting a Mersenne Prime integer and a primitive polynomial having an ORDER equal to the Mersenne Prime integer. An...
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5854841 |
Communication system
Data is compressed/encrypted for communication between application programs without addition of any modification to the application programs. In a communication system where a plurality of personal...
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5850452 |
Method for numerically scrambling data and its application to a programmable circuit
The present invention concerns a method for the numerical scrambling by permutation of data bits in a programmable circuit comprising a control unit and at least one data bus (DBUS) to transmit...
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5841872 |
Encryption enhancement system
A system for enhancing an existing data encryption system by preprocessing or postprocessing the data stream as it enters or leaves the encryption system. This external processing makes the...
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5841864 |
Apparatus and method for authentication and session key exchange in a communication system
The apparatus (101, 110) and method for authentication is provided by generating R and encrypting it using a selected algorithm K as the key in a primary station, encrypting the verification key, V...
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5841978 |
Network linking method using steganographically embedded data objects
A given data object can effectively contain both a graphical representation to a network user and embedded information, such as the URL address of another network node, thereby to permit the object...
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5838796 |
Statistically optimized bit permutations in interated block substitution systems
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each data bit affects each other data...
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5838795 |
Method and apparatus for statistical diffusion in iterated block substitution
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each sub-block of data affects each...
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5838794 |
Method and apparatus for inter-round mixing in iterated block substitution systems
A method and apparatus for inter-round mixing in iterated block substitution systems is disclosed. The method involves optimizing inter-round mixing so that each sub-block of data affects each...
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5835600 |
Block encryption algorithm with data-dependent rotations
A simple encryption and decryption device has been developed. The underlying algorithm is a fast block cipher that may be implemented efficiently in hardware or software. The algorithm makes heavy...
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5835597 |
Software-efficient pseudorandom function and the use thereof for decryption
A software-efficient pseudorandom function maps an index and an encryption key to a pseudorandom bit string useful for constructing a stream cipher. The method begins by preprocessing the...
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5832089 |
Off-line compatible electronic cash method and system
An off-line electronic cash system having an electronic coin, a bank B, a payee S, and a user U with an account at the bank B as well as a user password z u ,i, has a method for performing an...
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5825882 |
Encryption and authentication method and circuit for synchronous smart card
Encryption circuits and methods, in particular for smart cards, are disclosed. Smart cards without microprocessors may be authenticated very simply by using encryption with a secret card data table...
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5825886 |
Construction symmetric ciphers using the cast design procedure
A new design procedure for constructing a family of DES-like Substitution-Permutation Network (SPN) cryptosystems with desirable cryptographic properties including provable resistance to...
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5822432 |
Method for human-assisted random key generation and application for digital watermark system
A method for the human-assisted generation and application of pseudo-random keys for the purpose of encoding and decoding digital watermarks to and from a digitized data stream. A pseudo-random key...
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5819289 |
Data embedding employing degenerate clusters of data having differences less than noise value
A method of embedding auxiliary information into a set of host data, such as a photograph, television signal, facsimile transmission, or identification card. All such host data contain intrinsic...
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5818940 |
Switching matrix
A deciphering unit having input and output matrices connected to a master ift register to permit flexible access to its stages. The output matrix allows selection of four register positions in the...
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5812666 |
Cryptographic key management and validation system
A Key Management System for generating, distributing and managing cryptographic keys used by an information transaction system that employs cryptographic means to produce evidence of information...
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5809147 |
Device for cryptographically processing data packets and method of generating cryptographic processing data
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...
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5798711 |
High throughput embedded code hopping system with bypass mode
A system for monitoring and controlling an area comprising a controller for controlling system operational functions; at least one remote control transmitter for transmitting at least one system...
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5796837 |
Apparatus and method for generating a secure substitution-box immune to cryptanalyses
The apparatus for generating a secure substitution-box immune to differential and linear cryptanalysises comprises a preprocessor for exchanging a location by the unit of bit while passing the...
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5796836 |
Scalable key agile cryptography
A system and method for encrypting blocks of plain text. Output FIFO memories are provided for decoupling pseudorandom vector generation from plain text encryption. The output FIFOs produce the...
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5793659 |
Method of modular reduction and modular reduction circuit
A method of modular reduction P mod Q based on a precomputation. Two quantities are precomputed and stored in a look-up table. Based on these stored precomputed quantities, two stages of partial...
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5793869 |
Method and apparatus for encoding and data compressing text information
A method and apparatus for encoding and compressing a text word of ASCII code by substituting a binary number for said word and sending, storing or recording said binary number. The binary number...
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5793871 |
Optical encryption interface
An analog optical encryption system based on phase scrambling of two-dimensional optical images and holographic transformation for achieving large encryption keys and high encryption speed. An...
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5790675 |
Cryptographic communication process
A novel asymmetrical cryptographic schema which can be used for enciphering, signature and authentication. The schema is based on low degree public polynomial equations with value in a finite ring...
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5787178 |
Computerized method for signing a message
A computerized method for signing a message, where a secret key is used for signing and the signature can be tested with the help of a public key, provides for the public key to be a number n that...
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5787173 |
Cryptographic key management method and apparatus
A system for the secure communication of a message from a transmitting user to a receiving user using a split key scheme. Each user generates a key component using a cryptographic engine. The key...
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5787367 |
Flash reprogramming security for vehicle computer
A system and method for providing secured programming for reprogramming on-board vehicle computer systems. The system includes an interface tool which communicates with a selected on-board computer...
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5784652 |
Modular camera with cassette chamber accessible through outerbody
A camera for roll film which can be wound into a film cassette has a central subassembly forming a light-tight inner body in which a film cassette chamber which receives the film cassette is...
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5781629 |
Digital document authentication system
A process for time-stamping a digital document is provided. The process provides a certificate which not only allows for the authentication of a document at a later time but which includes a name...
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5778073 |
Method and device for speech encryption and decryption in voice transmission
A digitized real voice signal is converted via complex filtering into a complex signal that is subjected to sampling rate reduction, the bandwidth of the respective complex filter corresponding to...
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5778074 |
Methods for generating variable S-boxes from arbitrary keys of arbitrary length including methods which allow rapid key changes
A system for generating variable substitution boxes from arbitrary keys for use in a block cipher system utilizes an initial set of linearly independent numbers to generate substitution tables. The...
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5764771 |
Method for processing a digital signal in a so-called secure communication system and use of this method for access control and/or binary signature
The present invention relates to a method of processing a digital signal of dimension k, in a so-called secure communication system, such that the digital signal (y) at output cannot be deduced...
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5764766 |
System and method for generation of one-time encryption keys for data communications and a computer program product for implementing the same
A system and method and computer program product for encrypting data communications comprising the generation of a salt at a data transmitting system and combination of the salt with a primary...
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5754658 |
Adaptive encryption to avoid processor oversaturation
A method, apparatus, and storage medium for encoding data. According to one embodiment, the data is encrypted with a variable encryption technique, and the encryption is varied to prevent...
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5751812 |
Re-initialization of an iterated hash function secure password system over an insecure network connection
Methods and apparatus are disclosed for re-initializing a secure password series based on an iterated hash function. User login information is communicated over an insecure network connection or...
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