![]() This chapter presents the fundamentals of multimedia encryption, including basics of modern encryption, unique issues, and requirements in multimedia encryption, and typical multimedia encryption schemes. These features increase the effectiveness of generic time-memory tradeoff attacks on the cipher, making such attacks feasible. Additionally, many of the keystream sequences produced are phase shifted versions of each other, for very small phase shifts. Multiple (key, frame number) pairs produce the same keystream, and the relationship between the various pairs is easy to determine. frame number as inputs, and produces an output keystream of length berween 2⁸ and 2¹⁰ bits.Īnalysis of the initialisation process for the keystream generator reveals serious flaws which significantly reduce the number of distinct keystreams that the generator can produce. The keystream generator takes a 64-bit secret key and 19-bit. The design is based on four linear feedback shift registers, three of which are irregularly clocked. The keystream generator may be considered as a finite state machine, with an internal state of 81 bits. Read moreĪ5-GMR-1 is a synchronous stream cipher used to provide confidentiality for communications between satellite phones and satellites. The proposed algorithm introduces high resistance against different attacks that are applied to RC4 and the generated key stream has high randomness, large complexity, and good statistical properties. RC4 and the proposed algorithm are analyzed and proved that the new algorithm has no single or double byte bias in the key stream while RC4 has proved the same bias that is shown in the literature. The keystream depends on all preceding state bytes. The new idea allows random access to the key stream. This paper presents a new stream cipher algorithm as a development for RC4, named double RC4 key generation, which is submitted to solve interconnection problems in the output of the inner state and solve the problem of weak keys. Thus, the byte analysis makes it probable for attacking RC4 in some methods of operations. The initial few bytes of keystream that are generated by pseudo random generation algorithm (PRGA) are biased to several bytes of the private key. It has different weaknesses such as the bias that occurs in the key stream bytes. It is symmetric encryption, fast, and simple algorithm. RC4 stream cipher is an encryption algorithm that is used in two domains of security realized for IEEE 802.11 LANs: one of them is wired equivalent confidentiality and the other is WI-FI Protected Access protocol.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |