RC4 isn't perfect, but it's immune to some attacks (e.g. BEAST) that block ciphers like AES tend to have problems with. RC4 actually has a huge internal state.

RC4 isn't perfect, but it's immune to some attacks (e.g. BEAST) that block ciphers like AES tend to have problems with. RC4 actually has a huge internal state. You could use a 1600 bit key with it if you wanted to.