How to extract and expand randomness : a summary and explanation of existing results
Cliff, Yvonne, Boyd, Colin, & Gonzalez Nieto, Juan M. (2009) How to extract and expand randomness : a summary and explanation of existing results. In Applied Cryptography and Network Security, 2-5 June 2009, Place de l'Etoile , Paris.
We examine the use of randomness extraction and expansion in key agreement (KA) pro- tocols to generate uniformly random keys in the standard model. Although existing works provide the basic theorems necessary, they lack details or examples of appropriate cryptographic primitives and/or parameter sizes. This has lead to the large amount of min-entropy needed in the (non-uniform) shared secret being overlooked in proposals and efficiency comparisons of KA protocols. We therefore summa- rize existing work in the area and examine the security levels achieved with the use of various extractors and expanders for particular parameter sizes. The tables presented herein show that the shared secret needs a min-entropy of at least 292 bits (and even more with more realistic assumptions) to achieve an overall security level of 80 bits using the extractors and expanders we consider. The tables may be used to �nd the min-entropy required for various security levels and assumptions. We also �nd that when using the short exponent theorems of Gennaro et al., the short exponents may need to be much longer than they suggested.
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|Item Type:||Conference Paper|
|Keywords:||randomness extraction, key agreement , randomness expansion, key exchange protocols|
|Subjects:||Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > DATA FORMAT (080400) > Data Encryption (080402)|
Australian and New Zealand Standard Research Classification > INFORMATION AND COMPUTING SCIENCES (080000) > COMPUTATION THEORY AND MATHEMATICS (080200) > Analysis of Algorithms and Complexity (080201)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Institutes > Information Security Institute
|Copyright Owner:||Copyright 2009 Springer|
|Copyright Statement:||The original publication is available at www.springerlink.com|
|Deposited On:||02 Oct 2009 08:36|
|Last Modified:||29 Feb 2012 23:55|
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