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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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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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6125186 |
Encryption communication system using an agent and a storage medium for storing that agent
An agent is permanently resident in a server as software for the purpose of cryptographic processing. In addition, another agent that is described in mobile code and contains a program for the...
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6041411 |
Method for defining and verifying user access rights to a computer information
A method for minimizing the potential for unauthorized use of digital information, particularly software programs, digital content and other computer information, by verifying user access rights to...
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4972475 |
Authenticating pseudo-random code and apparatus
A matrix code generating method generates a first predetermined code in binary form. A second step permutes the first determined code according to a non-linear feedback method described as...
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4591704 |
Data scrambling system and method
Credit cards to be used with automated systems such as vending machines or the like have various identification and other data encoded on them for use with a particular system for which they are...
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4217469 |
Coding and decoding apparatus for the protection of communication secrecy
Apparatus for coding and decoding of electrical signals within a pre-established frequency band and useful for providing communication secrecy. A transmission and coding circuit and a reception and...
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4125744 |
Communication system
In a pulse code modulation system, a source of key signals comprising a source of random pulses, multisection delay device, means for applying said pulses to said multisection delay device,...
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3485948 |
PERFORATED TAPE ACCESSORY APPARATUS FOR A CIPHERING MACHINE
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3479456 |
SYNCHRONIZING MECHANISM FOR ENCRYPTING TELEGRAPH TRANSMITTER
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3345500 |
Cyclic code generating means
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3319000 |
Ciphering device
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3214518 |
Apparatus for coding and decoding teleprinter messages
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3067299 |
Combination-code signal-generating apparatus
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3057955 |
Cryptographic ancillary equipment
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2981794 |
Teleprinter secrecy system
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2949501 |
Apparatus for producing punched coding tapes of very long period
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2897268 |
Cipher telegraph system
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2872514 |
Random signal generator
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