| 7043645 |
Reproducing apparatus, recording apparatus and display apparatus |
| May-9-2006 |
A reproducing apparatus for reproducing data from a recording medium and supplying the data to an external apparatus for recording of the data. The reproducing apparatus has a plurality of authenticators... |
| 6952478 |
Method and system for performing permutations using permutation instructions based on modified omega and flip stages |
| Oct-4-2005 |
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 applications.... |
| 6587948 |
Recording apparatus, recording medium, playback apparatus, recording method and playback method |
| Jul-1-2003 |
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 recorded... |
| 6496107 |
Voice-controlled vehicle control system |
| Dec-17-2002 |
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 identification... |
| 6175625 |
Control circuits for electric coding machines |
| Jan-16-2001 |
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 keyboard is... |
| 6130946 |
Cryptographs |
| Oct-10-2000 |
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 series of... |
| 6097812 |
Cryptographic system |
| Aug-1-2000 |
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 of... |
| 6083667 |
Optical recording medium |
| Jul-4-2000 |
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 first-type... |
| 6055635 |
Method and device for facilitating access to a multitude of alphanumeric sequences |
| Apr-25-2000 |
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. According... |
| 5724427 |
Method and apparatus for autokey rotor encryption |
| Mar-3-1998 |
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 arbitrary... |
| 4675477 |
Electronic device providing automatic permutations of a Vigenere Square |
| Jun-23-1987 |
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. |
| 4401973 |
Cycle limiting means for an electromechanical decoder |
| Aug-30-1983 |
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 plurality... |
| 4343967 |
Autokey code generator |
| Aug-10-1982 |
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 the... |
| 4208545 |
Secrecy system |
| Jun-17-1980 |
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 a higher... |
| 4204088 |
Means for establishing various communication conditions in a cryptographic system |
| May-20-1980 |
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 comprising... |
| 4187393 |
Key generator |
| Feb-5-1980 |
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 driven... |
| 4182929 |
Circuit for simulating the scrambling of an electromechanical rotor |
| Jan-8-1980 |
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 on the... |
| 4177486 |
Facsimile device |
| Dec-4-1979 |
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 contacts... |
| 4177485 |
Facsimile apparatus |
| Dec-4-1979 |
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 steps... |
| 4173025 |
Electrical signal scrambling apparatus |
| Oct-30-1979 |
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 controlling... |
| 4156314 |
Rotors for a ciphering machine |
| May-29-1979 |
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 its inner... |
| 4124311 |
Mechanical movements for coding machines |
| Nov-7-1978 |
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 bail operable... |
| 3984922 |
Rotors |
| Oct-12-1976 |
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 plurality... |
