What is RC4? Is RC4 secure?

Table of Contents

• How secure is RC4?
• Variants of the RC4 cipher
• Advantages and Disadvantages

Rivest Cipher 4, or RC4, is a stream cipher created in 1987. A stream cipher is a type of cipher that operates on data a byte at a time to encrypt that data. RC4 is one of the most commonly used stream ciphers, having been used in?Secure Socket Layer (SSL)/ Transport Layer Security (TLS)?protocols, IEEE 802.11 wireless LAN standard, and the Wi-Fi Security Protocol WEP (Wireless Equivalent Protocol). RC4 owes its popularity, relating to stream ciphers, to its ease of use and performance speed. Now, significant flaws mean RC4 is not used nearly as often as before.

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