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首页> 外文期刊>IEEE Transactions on Information Theory >Secret-key agreement over unauthenticated public channels .II. Privacy amplification
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Secret-key agreement over unauthenticated public channels .II. Privacy amplification

机译:未经授权的公共渠道的秘密密钥协议。隐私放大

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摘要

For pt. II see ibid., vol.49, no.4, p.832-38 (2003). Here, we consider the special case where the legitimate partners already share a mutual string which might, however, be partially known to the adversary. The problem of generating a secret key in this case has been well studied in the passive-adversary model - for instance, in the context of quantum key agreement - under the name of privacy amplification. We consider the same problem with respect to an active adversary and propose two protocols, one based on universal hashing and one based on extractors, allowing for privacy amplification secure against an adversary whose knowledge about the initial partially secret string is limited to one third of the length of this string. Our results are based on novel techniques for authentication secure even against adversaries knowing a substantial amount of the "secret" key.
机译:对于pt。 II参见同上,第49卷,第4期,第832-38页(2003)。在这里,我们考虑一种特殊情况,即合法合作伙伴已经共享了一个共同的字符串,但是对手可能会部分了解它们。在这种情况下生成秘密密钥的问题已经在被动对手模型中得到了很好的研究,例如在量子密钥协议的上下文中,以隐私放大的名义。对于主动攻击者,我们考虑了相同的问题,并提出了两种协议,一种基于通用哈希,一种基于提取器,从而可以针对对原始部分秘密字符串的了解仅限于三分之一的对手安全地进行隐私放大。此字符串的长度。我们的结果基于即使对于知道大量“秘密”密钥的攻击者也可以确保安全的新型身份验证技术。

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