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COMMENTS ON A THRESHOLD AUTHENTICATED ENCRYPTION SCHEME

机译:关于阈值授权加密方案的评论

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摘要

An authenticated encryption scheme (AE scheme) allows the signer to generate a valid authenticated ciphertext on a message such that the designated recipient can recover the message. AE schemes can achieve confidentiality and authenticity when message is transmitted over an insecure channel. The previous AE scheme only can allow one signer to generate the authenticated ciphertext. Recently, Chung et al. proposed a (t, n) threshold authenticated encryption scheme (TAE scheme) in which any t or more signers cooperate to produce a signature for a message and no one except the designated verifier can obtain the message from the ciphertext and verify the authenticity and integrity of the message. The scheme is based on elliptic curve cryptosystem. Moreover, the scheme applies a division-of-labour signature technique to reduce the load of every signer. In other words, every signer only needs to sign a message block assigned to it. Therefore, the (t, n) TAE scheme is more efficient than other AE schemes. However, some flaws of the scheme are found in this paper. Several security defects of the scheme are elaborated: (i) It suffers from conspiracy attack, (ii) It does not hold robustness, (iii) It is insecure against insider attacks. In addition, there exist some design defects in the TAE scheme. Some measures to remove these weaknesses are given in this paper.
机译:认证加密方案(AE方案)允许签名者在消息上生成有效的认证密文,以便指定的收件人可以恢复该消息。当通过不安全的信道发送消息时,AE方案可以实现机密性和真实性。先前的AE方案只能允许一个签名者生成经过身份验证的密文。最近,Chung等。提出了一种(t,n)门限认证加密方案(TAE方案),其中任何t个或多个签名者合作为消息生成签名,除指定的验证者之外,没有人可以从密文中获取消息并验证真实性和完整性消息。该方案基于椭圆曲线密码系统。此外,该方案采用了分工签名技术以减轻每个签名者的负担。换句话说,每个签名者只需要签名分配给它的消息块。因此,(t,n)TAE方案比其他AE方案更有效。但是,该方案存在一些缺陷。详细阐述了该方案的一些安全缺陷:(i)遭受串谋攻击,(ii)不具有鲁棒性,(iii)对内部攻击没有安全感。另外,TAE方案中存在一些设计缺陷。本文提供了一些消除这些弱点的措施。

著录项

  • 来源
  • 作者

    Zuowen Tan;

  • 作者单位

    Department of Computer Science & Technology, School of Information Technology, Jiangxi University of Finance and Economics, Nanchang 330032, Jiangxi Province, P.R. China,Key Lab of Network Security and Cryptology, School of Mathematics and Computer Science, Fujian Normal University,Fuzhou 350007, P.R. China;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    public key cryptosystem; threshold cryptosystem; authentication; robustness;

    机译:公钥密码系统;门限密码系统;认证;稳健性;

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