Method of providing an encrypted data stream
A technology for encrypting data and data streams, applied to the usage of multiple keys/algorithms, digital transmission systems, and key distribution, which can solve problems such as delays in decryption devices
Inactive Publication Date: 2007-10-03
IRDETO ACCESS
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[0116] An overview of a system for implementing the methods described herein is given in FIG. 1 . The central head-end system 1 provides a first data stream, which is divided into segments corresponding to key periods.
[0117] Two specific applications are discussed in detail here. In the first application, the same clean content data is pre-encrypted several times to form multiple data streams pre-encrypted in different ways. Segments from two or more such pre-encrypted data streams are mixed to form a uniquely encrypted copy of the data stream. In the second application, the composition of the pre-encrypted content stream is adapted to different final receivers. An end receiver corresponds to an end user equipped with a receiver device comprising a descrambler, and an access token for providing the descrambler with the control word in unencrypted form. An access token corresponds to a security device such as a smart card. Said receiver systems are known per se and will ...
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A method of providing an encrypted data stream, includes obtaining a first data stream (17;41;63;78;92), partitioned into sections corresponding to key periods (18-22;45-48;71-74;80-84;96-99), each of a plurality of the key periods (18-22;45-48;71-74;80-84;96-99) being associated with a respective value of a key, wherein each section corresponding to a key period associated with a value of the key includes at least one encrypted data unit (10) decryptable using that associated key value, obtaining a sequence of key messages, at least some of which carry key information for obtaining at least one of the key values, obtaining a replacement data stream section (30-31; 42,43; 65,66; 85,86; 93,94), forming an encrypted output data stream (39; 44; 69; 88; 113), corresponding at least partially to the first data stream (17;41;63;78;92), by inserting the replacement data stream section so as to replace a corresponding part of the first data stream with a tail end of the replacement data stream section preceding at least part of a section of the first stream corresponding to a certain key period (21;48;71;83;99), and providing as output the encrypted output data stream (39;44;69;88;113) in synchrony with an associated stream (40;54;70;89;114) of key messages. A key message carrying key information for obtaining the key value associated with the certain key period (21;48;71;83;99) is included in the stream of key messages (40; 54; 70; 89; 114) so as to coincide with a point of the encrypted output data stream (39;44;69;88;113) preceding the tail end of the replacement data stream section. <SDOCL LA=EN> 36 CLAIMS 1. Method of providing an encrypted data stream, including obtaining a first data stream (17;41;63;78;92), partitioned into sections corresponding to key periods (18-22;45-48;71-74;80-84;96-99), each of a plurality of the key periods (18-22;45-48;71-74;80-84;96-99) being associated with a respective value of a key.
Description
technical field [0001] The invention relates to a method of providing an encrypted data stream, comprising: [0002] Obtaining a first data stream divided into segments corresponding to key periods, each of a plurality of key periods associated with a corresponding key value, wherein each of the key periods corresponding to a key value a segment comprises at least one encrypted data unit, which can be decrypted using said associated key value, [0003] obtaining a sequence of key messages, at least some of which carry key information for obtaining at least one key value, [0004] get the replacement data stream segment, [0005] An encrypted output data stream is formed by inserting a replacement data stream segment, thereby replacing a corresponding portion of the first data stream segment with an end of a replacement data stream segment preceding at least a portion of the first stream segment corresponding to a particular key period, said encrypted output the data stream ...
Claims
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IPC IPC(8): H04L9/08H04L9/16
CPCH04L9/08H04L9/0891H04N21/26606H04L2209/60H04L9/14H04L9/00
Inventor 安德鲁·A·瓦杰斯
Owner IRDETO ACCESS