This tool won't necessarily crack an rc4 cipher, but will slim down the possible results to help lead to cracking it. It tries either a brute force or dictionary attack against the cipher and outputs only the results that include printable characters.

Usage: rc4crack -c HEXCIPHER {-b [-s luns][-m customcharset][-l lower upper] | -d -w /path/to/wordlist}[-h] Look, basically you input your cipher after -c then choose if you want a brute force (-b), or dictionary (-d) attack. With a brute force attack you can choose what charsets you want to include such as lower (l), upper (u), numeric (n), or symbols (s), just include them as one string, no spaces. Or you can even specify a custom charset (-m), then you provide the upper and lower limits (-l). Default charset is lun, default limits are 1 4. For a dictionary attack just be sure to include a wordlist (-w).