Security Analysis of Two Authenticated Encryption Schemes
Authenticated encryption scheme is very useful for transmitting a confidential message in insecure networks. Recently,Li et.al give a new forward-security authenticated encryption scheme,and Hung-Yu Chien also give a convertible authenticated encryption scheme. However,our analysis shows that the two schemes are extremely insecure.The common flaw of the two schemes is forgeability and repudiation. After we give the corresponding attack to the two authenticated encryption schemes respectively,we propose two secure publicly verifiable authenticated encryption schemes to overcome the flaws of Li et.al scheme and HungYu Chien Scheme. As for efficiency,the computation cost and communication overhead of our proposed schemes are about as small as the two original schemes: Li et.al scheme and Hung-Yu Chien scheme. In second improved scheme,we do not use hash function yet,and the scheme satisfies forward security. Finally,secure proof of the scheme is given.schemes.
Jianhong Zhang Qin Geng
College of Sciences North China University of Technology Shijingshan District,Beijing 100144,China
国际会议
成都
英文
158-163
2008-01-01（万方平台首次上网日期，不代表论文的发表时间）