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. The same algorithm is used for both encryption and decryption as the data stream is simply XORed with the generated key sequence. software.RC4 was kept as a trade secret by RSA Security. 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). Example-1: Step-1: Choose two prime number and Lets take and ; Step-2: Compute the value of and It is given as, It uses a variable length key from 1 to 256 bit to initialize a 256-bit state table. Modern cryptography is essential to the digital world we live in and has grown to be quite complex. The RC4 algorithm is remarkably simple and quite easy to explain, shown in figure 3. 2. There are simple steps to solve problems on the RSA Algorithm. Even when is set to , the hash algorithm SHA-1, which is used for signing a root certificate, can be used. This can be demonstrated in a cryptanalysis of the Microsoft Office encryption up to the 2003 version. RC4 stream cipher is one of the most significant symmetric cryptosystems, it is simple and used in many commercial products. Often these algorithms use a unique key which should be kept secret, in which case the process for generating and sharing the key is also considered part of the cryptosystem. RSA algorithm is an asymmetric cryptography algorithm which means, there should be two keys involve while communicating, i.e., public key and private key. RC4 was initially a trade secret, but in September 1994 a description of it was anonymously posted to the Cypherpunks mailing list. RC4 was created by Ron Rivest of RSA Security in 1987. At all (Not recommended.) History. seed: 1 2 3 6 (b) plain text: RC4. In cryptography, a cryptosystem is a suite of cryptographic algorithms needed to implement a particular security service, most commonly for achieving confidentiality ().. A cryptosystem is a pair of algorithms: one for the encryption of data and another for decryption. New material can only be encrypted using RC4 or RC4_128 when the database is in compatibility level 90 or 100. FIPS 140-2 Standard Algorithm When is set to , the following algorithms are prohibited from use. seed: 5 7 8 9. The key stream is completely independent of the plaintext used. 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. one-time pad (Vernam system), to become totally insecure. RC4 ALGORITHM RC4 is a stream cipher, symmetric key algorithm. 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