| 基于口令的密钥提取 |
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| 引用本文： | 刘迎风,刘胜利.基于口令的密钥提取[J].西安电子科技大学学报,2021,48(1):61-68. |
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| 作者姓名： | 刘迎风 刘胜利 |
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| 摘 要： | 使用口令进行身份认证是应用最广泛的一种认证方式.口令的特点是容易记忆,但其概率分布欠均匀,故无法将口令直接当作密钥来使用,也无法使用口令来调用现有的密码算法实现密码功能.探索了如何充分使用口令中的熵值,对其进行提取以得到均匀随机的密钥,并提出了一个"基于口令的密钥提取方案".首先对口令的熵进行了估计;之后使用了特普利茨...
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| 关 键 词： | 口令 均匀 密钥提取 |
| 收稿时间： | 2020-09-21 |
Key distillation from passwords |
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| LIU Yingfeng,LIU Shengli.Key distillation from passwords[J].Journal of Xidian University,2021,48(1):61-68. |
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| Authors: | LIU Yingfeng LIU Shengli |
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| Affiliation: | 1. Shanghai Metropolitan Big Data Center,Shanghai 200072,China;2. State Key Laboratory of Cryptology,Beijing 100878,China;3. Department of Computer Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;4. Westone Cryptologic Research Center,Beijing 100070,China |
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| Abstract: | Authentication via passwords is one of the most widely-used method for identification.Passwords can be easily memorized,but they are hardly uniformly distributed.For lack of uniformity,passwords cannot be used as keys for cryptographic schemes directly.In this paper,we explore the approach to key distillation from passwords by utilizing the entropy in passwords.To this end,we present a key distillation scheme from passwords.We first estimate the entropy of passwords,and then make use of Toeplitzmatrices to transform passwords into keys and analyze the lengths of the distilled keys.Besides,we also discuss how to distill multiple keys from the same password.Our approach can be closely combined with the modern cryptographic techniques to fulfill cryptographic functionalities. |
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| Keywords: | passwords uniformity key distillation passwords uniformity key distillation |
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