摘要
2005年,Sun等提出了两个完美前向安全的E-mail协议,尽管从短密钥保护的有效性来看这两个协议是安全的,但它们都不能提供密文的认证性,如果一个主动攻击者拦截或修改密文,则E-mail接受者会收到一个错误的明文。为了克服此缺点,对此两个协议作了改进,使得改进后的协议具有认证性,从而有更好的安全性和实用性。
In 2005,Sun et al have proposed two secure e-mail protocols with perfect forward secrecy.Although these two protocols seem to be secure from the protective efficiency of the short-term key,yet neither of them has considered the authentication of the delivering ciphertext.If an outside attacker intercepts and modifies a delivering ciphertext,the e-mail receiver will have to accept a false plaintext.To overcome this flaw,in this paper we will make improvements on Sun et al.＇s protocols such that the improved protocols have authentication,better security and practicality.
出处
《计算机工程与应用》
CSCD
北大核心
2008年第21期69-71,共3页
Computer Engineering and Applications
基金
国家自然科学基金(the National Natural Science Foundation of China)
