RC4 encryption and decryption tool

1. RC4 (Rivest Cipher 4) is a stream cipher used to secure various forms of communication, particularly in wireless communications and SSL/TLS protocols.

2. RC4 offers advantages such as high speed, a simple algorithm, and variable key lengths.

3. RC4 has security issues, including weak keys, keystream bias, and the ability to reconstruct plaintext from multiple keystreams.

4. Note: RC4 has been deprecated by many modern standards and protocols.