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| Skipper Wiki now has over 6,000 unique articles on file! we are adding many more each day! | SkipperW is almost out of beta! Soon we will be adding links and information to all of our article resources. We are adding articles at a very fast pace now.Article: The Common Scrambling Algorithm ... ... (CSA) is the encryption method that the digital TV DVB is used to stream the video to encrypted. CSAwaskept secret for several years. Some information came from the Patent written into the open, important details Remained secret, seeking as the construction of the so-called S-Box en. Without these details was a free implementation of the algorithm is not possible. CSAshould be initially implemented only in hardware, Which It Seemed Impossible The Necessary details by Reverse Engineering existing implementation s, for example Conditional Access Modules (CAM) to. Determine In 2002 a program calledFreeDecappeared, Which implemented theCSAin software. The program was only as a binary version (ie: Executable) available. Hacker disassembled the software and determined that the missing details. This made it possible for a implementation ofCSAin a High-language to achieve. Since then, the algorithm forCSAis fully known now cryptanalyst for weak points in the process. How PROCEDURE OF with other Encryption is a point of attack is the fact that parts of the Plain Text it to be known or at least accept them as very likely to be (eg MPEG header). The length of the key (in this caseControl Word) of 64-bit result 2 ^ {64} options Encryption. If one were to try all possible keywords with the help of a computer and this for each test 1? S need, the search lasted about 500 000 years. Through adoption of certain plain text bytes, conclusions can be draw on the key used to reduce the total number of possible keys clearly. It should be possible by cryptanalysis, to "guess" the key used by knowledge of the plain language structure, would becrackedand CSA would all Conditional Access System useless. This is still not the case. Weblinks
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