Rather than what is accepted as the strongest ciphers I prefer ciphers not optimized by CPU's and GPU's. Spooks will have to cycle through every combination of protocol + cipher + mac + mode + passphrase + whatever other obfuscation I shim inside that tunnel. Keep 'em on their toes. Even better I will also cycle through these encoding methods [1] if I am in a good mood otherwise I will rot13 their ass and then force them to use a Drogan’s Decoder Wheel.