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7567669 |
Strengthened public key protocol
A method of determining the integrity of a message exchanged between a pair of correspondents. The message is secured by embodying the message in a function of a public key derived from a private...
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7401221 |
Advanced stream format (ASF) data stream header object protection
A header object for a data file is comprised of sub-objects which specify properties of the data stream and contains information needed to properly verify and interpret the information within the...
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7299493 |
Techniques for dynamically establishing and managing authentication and trust relationships
Techniques are provided for dynamically establishing and managing authentication and trust relationships. An identity service acquires and evaluates contracts associated with relationships between...
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7239709 |
Data recording/reproducing method, data recording/reproducing system, recording apparatus
A data recording/reproducing method wherein encrypted digital data obtained by subjecting digital data to first encrypting by using a contents key and encrypted contents key obtained by subjecting...
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6952478 |
Method and system for performing permutations using permutation instructions based on modified omega and flip stages
The present invention provides permutation instructions which can be used in software executed in a programmable processor for solving permutation problems in cryptography, multimedia and other...
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6587948 |
Recording apparatus, recording medium, playback apparatus, recording method and playback method
A recording method and a recording apparatus whereby digital data is recorded onto a disc as run-length limited code used for modulating marks or spaces on the disc and, at the same time, the...
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6496107 |
Voice-controlled vehicle control system
A vehicle control system for permitting voice control of at least one device in a vehicle by at least one user includes a radio transponder unit which outputs an RF signal which includes an...
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6175625 |
Control circuits for electric coding machines
The machine involves code wheels in cascade or in a maze with random or mixed circuits which operate a printing device to print the cipher conjugate of the letter on an operated key when the...
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6130946 |
Cryptographs
The cryptographic system automatically and continuously changes the cipher equivalents representing plaintext characters so as to prevent any periodicity in the relationship. The system has a...
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6097812 |
Cryptographic system
The crytographic system automatically and continuously changes the cipher equivalents representing plaintext characters so as to prevent any periodicity in the relationship. The system has a series...
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6083667 |
Optical recording medium
An optical recording medium includes a transparent substrate having a surface formed with a track of pits. A reflecting layer extends on the surface of the transparent substrate. The pits include...
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6055635 |
Method and device for facilitating access to a multitude of alphanumeric sequences
A method and a device for facilitating authorized and simultaneously restraining unauthorized access to a multitude of alphanumeric sequences, for instance for credit cards, code keys and the like....
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5724427 |
Method and apparatus for autokey rotor encryption
A method an apparatus for block or stream encrypting text uses an autokeyed rotational state vector to encrypt plain text to yield cipher text. The text is stored as a block in a buffer of an...
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4675477 |
Electronic device providing automatic permutations of a Vigenere Square
This invention relates to cryptographic teletypewriter systems and more picularly to an electronic device for use in such systems which automatically provides permutations of a Vigenere Square.
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4401973 |
Cycle limiting means for an electromechanical decoder
1. A mechanism comprising a base member, a shaft supported by the base member, a rotatable code wheel assembly including a first wheel element and a second wheel element, carried by the shaft a...
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4343967 |
Autokey code generator
1. In an autokey code generator for use in secret communication systems, the combination of a source of cipher text code in pulse form; a source of reset pulses having a repetition period equal to...
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4208545 |
Secrecy system
1. In a system of secret telegraph communication, an incoming channel over which miscellaneous matter intelligence signals are periodically received, an outgoing channel susceptible of operating at...
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4204088 |
Means for establishing various communication conditions in a cryptographic system
4. In a telegraph system, interconnected stations, converters at each station comprising transmitting and receiving apparatus, a signal line connected to said stations, said transmitting apparatus...
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4187393 |
Key generator
2. An apparatus for producing a substantially noncyclic sequence of binary electric values, including a driving gear, a plurality of driven gears associated with said driving gear, each of said...
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4182929 |
Circuit for simulating the scrambling of an electromechanical rotor
1. A circuit for simulating the scrambling of an electromechanical rotor of the type wherein an input to an input contact on one side of the rotor appears on one of a plurality of output contacts...
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4177486 |
Facsimile device
1. In a facsimile system, a distributor including an array of n electrical contacts, a source of potential therefor and a normally rotating brush for applying potential from said source to said...
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4177485 |
Facsimile apparatus
1. In a facsimile apparatus, means for producing a stepped signal, the amplitudes of the steps being substantially dependent upon the photographic density of the subject and the durations of the...
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4173025 |
Electrical signal scrambling apparatus
2. In an apparatus of the nature described, the combination of means for storing a portion of an electrical signal, means for picking up elements of said portion, a plurality of switching means...
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4156314 |
Rotors for a ciphering machine
1. In a cryptographing machine, a commutator comprising a disc of insulation having an axial opening therethrough and having a peripheral flange thereon, and having a plurality of slots formed in...
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4124311 |
Mechanical movements for coding machines
1. A ciphering unit mechanism, comprising a rotatable cam sleeve provided th a plurality of cams, a clutch engageable to effect driving of said sleeve, a plurality of character keys, a swingable...
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3984922 |
Rotors
1. A cryptographic rotor including a first disc having an annular array of input contacts on one face thereof, a second disc having an annular array of output contacts on one face thereof, a...
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3891799 |
Coding device with light responsive key generator
2. In a code pulse generating system, a plurality of rotatable opaque members, circular rows of holes through said members, said rows being concentric with the axis of rotation in the case of each...
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3808355 |
SECRET SIGNALING SYSTEM
Photographic opposites of a given image, i.e., a photo positive and a photo negative of the given image, are employed as encoding and decoding elements at a transmitter and a receiver,...
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3627919 |
CODED RETICLE CATHODE-RAY TUBE CORRELATOR APPARATUS
An optical correlator object detecting and locating apparatus comprising a first rotatable reticle disposed in an optical receiver for uniquely encoding incident radiation in accordance with the...
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3569625 |
TELEMETRY DATA TRANSMISSION SYSTEM
In a data transmission system the combination comprising: A. a signal source representing a measured quantity; B. a reversible polarity DC power supply; C. a potentiometer connected to said...
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3483326 |
PRIVACY COMMUNICATIONS METHOD AND MEANS EMPLOYING FREQUENCY SHIFTING OF COMPONENTS OF VOICE SIGNALS
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3463873 |
COMMUNICATION CODING SYSTEM
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3379825 |
Subscription television system having raster distortion
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3336439 |
Pay television employing interfering sound signal
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3310624 |
Subscription television system using phase inverted video signals
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3279261 |
Random motion generator
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3210469 |
Coupling elements for telegraph transmitter
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3159712 |
Mechanical signal combiner
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3105111 |
High speed telegraphy
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3065294 |
Television system for high definition and secrecy of image
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2984700 |
Method and apparatus for cryptography
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2980901 |
Subscription television encoding apparatus
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2956121 |
Printing telegraph signal mutator
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2940005 |
Variable discontinuous interlaced scanning system
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2934833 |
Enciphering device
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2917579 |
Ciphering machines
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2847768 |
Subscription television encoding apparatus
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2847501 |
Subscription television system
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2809231 |
Subscriber television system
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2802047 |
Electric switching device for ciphering apparatus
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