RC4 Encrypt/Decrypt

About RC4

1) RC4 is a stream cipher used historically in wireless and SSL/TLS.

2) Fast, simple, with variable key length.

3) Known key stream weaknesses can expose plaintext.

4) Deprecated in most modern standards and protocols.

How to Use

What this tool does

Encrypts/decrypts text using a simple RC4 implementation for educational purposes.

Steps

Encrypt: type plaintext → Encrypt → enter key → ciphertext appears below.
Decrypt: paste ciphertext → Decrypt → enter same key → plaintext restored.

Examples

Text: "demo", Key: "k" → Encrypt → binary/garbled output (stream XOR).

Notes

RC4 has known weaknesses and is deprecated; use modern ciphers like AES.
Processing is local; keys/data are not uploaded.