基于ECDLP的密钥交换协议的猜密码攻击

Chungen Xu, Yanjiong Yang
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引用次数: 3

摘要

身份验证和密钥交换是在公共不安全网络上建立安全通信通道的基础。三方密钥交换协议是两个客户机在可信服务器的帮助下就会话密钥达成一致的一项重要技术,可信服务器与每个客户机共享人工密码。多年来,为了满足安全性和效率的要求,提出了许多协议。出于安全考虑,我们关注离线密码猜测攻击。对基于椭圆曲线离散对数问题(ECDLP)的三方密钥交换协议进行了攻击,证明了该协议易受离线猜密码攻击的攻击。事实上,离线猜密码攻击对恶意参与者是有效的,并且对类似的协议是有效的。为了避免这个问题,我们提出了消除它并加强安全性的建议。
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Password guessing attack on a key exchange protocol based on ECDLP
Authentication and key exchange are fundamental for establishing secure communication channels over public insecure networks. Three-party key exchange protocol is an important technique for two clients to agree a session key with the help of a trusted server who shares a human password with each client. Many protocols have been proposed for the requirements of security and efficiency over the years. For security consideration, we are concerned with the off-line password-guessing attack. We make the attack to a three-party key exchange protocol based on Elliptic Curve Discrete Logarithm Problem(ECDLP) and show that it is vulnerable against the off-line password-guessing attack. In fact, the off-line password-guessing attack is available for malicious participants and is effective to similar protocols. To avoid this problem, we give a suggestion to eliminate it and enforce the security.
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