最近运营商纷纷加入bt/emule等协议的过滤
魔高一丈，各大客户端就纷纷加入协议加密
效果就是让运营商的过滤器看不出那是一个bt/emule协议

rtorrent最新版0.7.0也加入了相关功能
使用方法很简单
在rtorrent.rc中加入
encryption = allow_incoming,enable_retry,prefer_plaintext
就是允许加密，但是以非加密优先
如果想以加密优先的话，就应该写成
encryption = allow_incoming,try_outgoing,enable_retry

有以下参数
allow_incoming
allow incoming encrypted connections
try_outgoing
use encryption for outgoing connections
require
disable unencrypted handshakes
require_RC4
also disable plaintext transmission after the initial encrypted handshake
enable_retry
if the initial outgoing connection fails, retry with encryption turned on if it was off or off if it was on
prefer_plaintext
choose plaintext when peer offers a choice between plaintext transmission and RC4 encryption, otherwise RC4 will be used