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arXiv 1805.00566cs.CR
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如何在网络上结束密码重复使用

How to end password reuse on the web

Ke Coby Wang, Michael K. Reiter

摘要:

我们提出了一个框架,通过该框架,网站可以协调,使用户难以在这些网站设置类似的密码,努力打破当今网络上的密码重用文化。虽然这样一个框架的设计充满了风险,用户的安全和隐私,我们表明,这些风险可以有效地减轻通过仔细的范围这样一个框架的目标,并通过原则性的设计。在我们的框架的核心是一个私人的集合成员测试协议,使一个网站,以确定,在用户设置密码使用它,该用户是否已经在另一个参与网站设置了类似的密码,但没有一方披露其他密码(S)它在协议中使用。然后,我们的框架在此协议上分层,收集技术以减轻此类测试所需的泄漏。我们通过概率模型检验验证这些技术在维护帐户安全方面是有效的,并且由于这些机制与当今常见的用户体验一致,因此我们的框架对于不跨网站重复使用类似密码的用户应该是不显眼的(例如,由于采用了密码管理器)。通过我们的框架的工作实现和优化其参数的基础上的见解如何密码往往被重用,我们表明,我们的设计可以满足这样的服务所面临的可扩展性的挑战。

英文摘要:

We present a framework by which websites can coordinate to make it difficult for users to set similar passwords at these websites, in an effort to break the culture of password reuse on the web today. Though the design of such a framework is fraught with risks to users' security and privacy, we show that these risks can be effectively mitigated through careful scoping of the goals for such a framework and through principled design. At the core of our framework is a private set-membership-test protocol that enables one website to determine, upon a user setting a password for use at it, whether that user has already set a similar password at another participating website, but with neither side disclosing to the other the password(s) it employs in the protocol. Our framework then layers over this protocol a collection of techniques to mitigate the leakage necessitated by such a test. We verify via probabilistic model checking that these techniques are effective in maintaining account security, and since these mechanisms are consistent with common user experience today, our framework should be unobtrusive to users who do not reuse similar passwords across websites (e.g., due to having adopted a password manager). Through a working implementation of our framework and optimization of its parameters based on insights of how passwords tend to be reused, we show that our design can meet the scalability challenges facing such a service.

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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