The key stream is completely independent of the plaintext used. FIPS 140-2 Standard Algorithm When is set to , the following algorithms are prohibited from use. Use a newer algorithm such as one of the AES algorithms instead. 4. Furthermore, the comparison of RC4 with RSA [23] shows that the algorithm of RC4 better than RSA based on the presented experimental and analytical results of both algorithms evaluated. This can be demonstrated in a cryptanalysis of the Microsoft Office encryption up to the 2003 version. New material can only be encrypted using RC4 or RC4_128 when the database is in compatibility level 90 or 100. In SQL Server 2012 (11.x) and higher material encrypted using RC4 or RC4_128 can be decrypted in any compatibility level. RC4 was designed by Ron Rivest of RSA Security in 1987. It uses a variable length key from 1 to 256 bit to initialize a 256-bit state table. While it is officially termed "Rivest Cipher 4", the RC acronym is alternatively understood to stand for "Ron's Code" (see also RC2, RC5 and RC6). RC4 ALGORITHM RC4 is a stream cipher, symmetric key algorithm. A variable-length key from 1 to 256 bytes (8 to 2048 bits) is used to initialize a 256-byte state vector S, with elements S[0], S[1], …, S[255]. History. The same algorithm is used for both encryption and decryption as the data stream is simply XORed with the generated key sequence. seed: 5 7 8 9. RC4 is known for being simple and quick, but attacks are likely to happen when the start of the output keystream is not removed, or one keystream is used twice; some ways of using RC4 can turn into very insecure cryptosystems such as WEP. 2. RC4 was initially a trade secret, but in September 1994 a description of it was anonymously posted to the Cypherpunks mailing list. Experiment the correctness of your program by using the following plain text and seed: (a) plain text: cryptology. Example-1: Step-1: Choose two prime number and Lets take and ; Step-2: Compute the value of and It is given as, There are simple steps to solve problems on the RSA Algorithm. At all RC4 was created by Ron Rivest of RSA Security in 1987. seed: 1 2 3 6 (b) plain text: RC4. Even when is set to , the hash algorithm SHA-1, which is used for signing a root certificate, can be used. RSA algorithm is an asymmetric cryptography algorithm which means, there should be two keys involve while communicating, i.e., public key and private key. one-time pad (Vernam system), to become totally insecure. software.RC4 was kept as a trade secret by RSA Security. Modern cryptography is essential to the digital world we live in and has grown to be quite complex. RC4 stream cipher is one of the most significant symmetric cryptosystems, it is simple and used in many commercial products. A cryptosystem is a pair of algorithms: one for the encryption of data and another for decryption. 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