|7308099||Device and method for producing an encoded audio and/or video data stream|
An apparatus for generating an encrypted data stream representing an audio and/or video signal comprises an encoder for encoding an input signal to generate a data stream with a predefined data stream syntax as output signal. The apparatus further comprises an encry...
|7266200||Method and apparatus for encryption of data|
A method and apparatus for encryption of data are provided, in which the data is made up of a series of data items (600). The data items (600) maybe bytes of data or blocks of data. The method includes providing a plurality of encryption algorithms (
A facsimile apparatus is provided with changeover means that makes it possible to pass signals through or to bypass a coder, which encrypts transmission information, and a decoder, which decodes encrypted information that has been received. Whether or not a facsimil...
|6414757||Document security system and method|
A system and method for secured image creation. A bitmap image is processed to separate color or greyscale planes, or is used as a greyscale, single plane image. The plane(s) are each converted into microtype character layers with each layer arranged at a...
|6269164||Method of and system for encrypting messages|
A technique for encrypting and decrypting a data message is described herein and includes a stream cipher, a block cipher and a key generation embodiment which use a process of Summary Reduction. This overall technique uses a secret key to generate cipher...
|6226384||Method and device for providing controlled access video signals without providing a signal in the clear|
A display device for receiving encrypted or scramble video data and for decrypting or descrambling the video data such that a signal is not provided "in the clear". The video data is stored in a memory array in an encrypted form and read out from the memo...
|6222926||Method and device for providing controlled access video signals without providing a signal in the clear|
A LCD display device for receiving encrypted video data and for decrypting the video data such that a signal is not provided "in the clear" before receipt by the display device. The video data is encrypted within a row of video and decrypted at the displa...
|4916739||Adhesive photocopyable transparency for use in a secure facsimile transmission system|
An adhesive photocopyable transparency for use in a secure facsimile transmission system wherein one of two partial documents each containing portions of an original document which are complementary and mutually exclusive is photocopied onto the transpare...
|4821321||Automatic secure transmission and reception of pictorial information|
A real time coding system for the transmission and reception of pictorial o-dimensional information at television (TV) rates. In one coding system, the input signal and a coding signal are modulo added in an operational amplifier and are transmitted there...
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 in sequence, a plurality of cryptographic rotors in ...
|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 controlling the conduction of said elements each switching me...