Decrypt given data previously encoded with rc4 cipher algo. RC4 is a stream cipher that generates a pseudo-random stream of bits used to encrypt data. RC4 was widely used in protocols like SSL/TLS and WEP due to its speed and simplicity but was eventually found to have severe security flaws. RC4 is no longer considered secure due to biases in its output and vulnerabilities that can be exploited in modern cryptanalysis. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.