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arXiv 1004.0799cs.ITmath.IT
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一种信源模型下秘密密钥共享的速率域

Rate Regions of Secret Key Sharing in a New Source Model

Somayeh Salimi, Mahmoud Salmasizadeh, Mohammad Reza Aref

摘要:

考虑了终端间秘密密钥生成的源模型。在一侧的两个用户,即用户1和2,经由公共信道与在另一侧的另一个用户,即用户3进行通信,在公共信道中,三个用户可以观察i.i.d.相关源的输出。用户1和2中的每一个都打算与用户3共享秘密密钥,其中用户1充当用户2的窃听器,反之亦然。在这个模型中,考虑了两种情况:从用户1和2到用户3的通信(前向键策略)和从用户3到用户1和2的通信(后向键策略)。在这两种情况下,目标是在用户1和用户3之间共享秘密密钥,同时不向用户2泄漏关于该密钥的有效信息,并且同时在用户2和用户3之间共享另一个秘密密钥,同时不向用户1泄漏关于该密钥的有效信息。当将用户3视为基站并且将用户1和2视为网络用户时,该模型由无线通信激发。本文推导了前向和后向两种密钥策略下秘密密钥容量区域的内界和外界。在特殊情况下,其中一个用户1和2只感兴趣的窃听,而不是密钥共享,我们的结果同意Ahlswede和Csiszar。此外,我们还研究了内界与外界重合的一些特殊情况,并推导出了秘密密钥的容量域。

英文摘要:

A source model for secret key generation between terminals is considered. Two users, namely users 1 and 2, at one side communicate with another user, namely user 3, at the other side via a public channel where three users can observe i.i.d. outputs of correlated sources. Each of users 1 and 2 intends to share a secret key with user 3 where user 1 acts as a wiretapper for user 2 and vice versa. In this model, two situations are considered: communication from users 1 and 2 to user 3 (the forward key strategy) and from user 3 to users 1 and 2 (the backward key strategy). In both situations, the goal is sharing a secret key between user 1 and user 3 while leaking no effective information about that key to user 2, and simultaneously, sharing another secret key between user 2 and user 3 while leaking no effective information about the latter key to user 1. This model is motivated by wireless communications when considering user 3 as a base station and users 1 and 2 as network users. In this paper, for both the forward and backward key strategies, inner and outer bounds of secret key capacity regions are derived. In special situations where one of users 1 and 2 is only interested in wiretapping and not key sharing, our results agree with that of Ahlswede and Csiszar. Also, we investigate some special cases in which the inner bound coincides with the outer bound and secret key capacity region is deduced.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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