What is RC4 pseudo random number generator algorithm?
RC4 is a pseudo random sequence generation algorithm developed in 1987 by Ron Rivest for RSA Data Security Inc. This algorithm is immune to differential and linear cryptanalysis. This document illustrates the implementation of RC4 based Pseudo-Random Number Generator (PRNG) for variable key sizes of five to ten bytes.
What RC4 explain with example?
RC4 means Rivest Cipher 4 invented by Ron Rivest in 1987 for RSA Security. It is a Stream Ciphers. Stream Ciphers operate on a stream of data byte by byte. RC4 stream cipher is one of the most widely used stream ciphers because of its simplicity and speed of operation.
How RC4 keys are generated?
RC4 relies on two mathematical concepts: KSA: A key-scheduling algorithm initializes the process in an array typically referred to as “S.” That “S” is processed 256 times, and bytes from the key are mixed in too. PRGA: Data is fed in byte by byte, and a mathematical model modifies it.
What is RC4 cipher used for?
The RC4 cipher became the most widely used stream cypher due to its speed and simplicity and is used in common protocols such as Wired Equivalent Privacy and Secure Sockets Layer and Transport Layer Security (TLS).
What are the features of RC4 algorithm?
RC4 Algorithm Features: subsequent generation of pseudo-random bytes and then to generate a pseudo-random stream which is XORed with the plaintext to give the ciphertext. Each element in the state table is swapped at least once. has the capability of using keys between 1 and 2048 bits.
What applications use RC4?
RC4 applications
- WPA.
- BitTorrent protocol encryption.
- WEP.
- Microsoft Office XP.
- Microsoft Point-to-Point Encryption.
- Transport Layer Security / Secure Sockets Layer.
- Secure Shell (optionally)
- Remote Desktop Protocol.
What is RC4 key schedule algorithm?
RC4 consists of two parts (described in Figure 1): A key scheduling algorithm KSA which turns a random key (whose typical size is 40-256 bits) into an initial permutation S of f0 ::: N ;1g, and an output generation part PRGA which uses this permutation to generate a pseudo-random output sequence.
Is RC4 asymmetric or symmetric?
symmetric encryption
Blowfish, AES, RC4, DES, RC5, and RC6 are examples of symmetric encryption. The most widely used symmetric algorithm is AES-128, AES-192, and AES-256. The main disadvantage of the symmetric key encryption is that all parties involved have to exchange the key used to encrypt the data before they can decrypt it.
What can I use instead of RC4?
RC4 is also known to have several significant flaws in the way it constructs and uses keys. Therefore, most security professionals recommend using alternative symmetric algorithms. Two of the most commonly used ones are the Triple Data Encryption Standard (3DES) and the Advanced Encryption Standard (AES).
Is RC4 outdated?
As of RFC7465, the RC4 cipher suite has been deprecated due to a number of exploits capable of decrypting portions of RC4 encrypted messages. This strike may operate in two different manners. In the first scenario, the client will send a mix of supported cipher suites, including RC4 cipher suites.