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Differential Fault Analysis (DFA) intentionally injects some fault into the encryption process and analyzes a secret key from the mathematical relationship between faulty and fault-free ciphertexts. E...
A growing number of connected objects, with their high performance and low-resources constraints, are embedding lightweight ciphers for protecting the confidentiality of the data they manipulate or st...
Fault attack countermeasures can be implemented by storing or computing sensitive data in redundant form, such that the faulty data can be detected and restored. We present a class of lightweight, por...
Certificateless public key cryptography was introduced to solve the key escrow problem in identity based cryptography while enjoying the most attractive certificateless property. In this paper, we p...
Wang and Yu showed that MD5 was not collision-resistant, but it is known that their sufficient conditions for finding a collision of MD5 includes some mistakes. In this paper, we examine the suffici...
Digital signature schemes based on public-key cryptosystems generally permit existential forgery, except the schemes are equipped with some message formatting mechanisms, such as using hash functions ...
在密码学中,使用Hash函数和Redundancy函数必然使签名方案因这些函数的不安全性而遭受相关攻击,从而导致签名方案的安全性降低。提出了一种不使用Hash和Redundancy函数的代理盲签名,其安全性等价于解离散对数问题,而且避免了使用相关函数带来的威胁。分析表明,新方案实现了电子交易中的不可伪造性和不可链接性,有效防止了双方事后抵赖;而且减少了求幂运算的次数,避免了求Hash函数运算,使签...
现有的有序多重数字签名方案都使用了Hash函数和消息冗余函数,这必将承受由Hash函数和消息冗余函数带来的安全威胁。首先指出了施方案(文献[1])中存在的安全性问题,随后利用椭圆曲线密码算法设计了一个新的有序多重数字签名方案,该方案不使用Hash函数和消息冗余函数,减少了这方面所带来的安全威胁;取消了施方案里的签名中心,避免了该签名中心的参与导致计算瓶颈的产生;所有消息均公开,签名者可以共同通过验...

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