when the attacker has access to an PCBC oracle,then ECB;cipher block chaining mode(CBC);cipher feedback mode(CFB);output feedback mode(OFB)can be attacked with ease.

• 相反如果攻击者能询问PCBC问答器,则攻击者能很容易攻破ECB、密码分组连接模式(CBC)、密码反馈模式(CFB)和输出反馈模式(OFB)。