词条 | Pairing-based cryptography |
释义 |
Pairing-based cryptography is the use of a pairing between elements of two cryptographic groups to a third group with a mapping to construct or analyze cryptographic systems. DefinitionThe following definition is commonly used in most academic papers.[1] Let be two additive cyclic groups of prime order , and another cyclic group of order written multiplicatively. A pairing is a map: , which satisfies the following properties:
ClassificationIf the same group is used for the first two groups (i.e. ), the pairing is called symmetric and is a mapping from two elements of one group to an element from a second group. Some researchers classify pairing instantiations into three (or more) basic types:
Usage in cryptographyIf symmetric, pairings can be used to reduce a hard problem in one group to a different, usually easier problem in another group. For example, in groups equipped with a bilinear mapping such as the Weil pairing or Tate pairing, generalizations of the computational Diffie–Hellman problem are believed to be infeasible while the simpler decisional Diffie–Hellman problem can be easily solved using the pairing function. The first group is sometimes referred to as a Gap Group because of the assumed difference in difficulty between these two problems in the group. While first used for cryptanalysis,[3] pairings have also been used to construct many cryptographic systems for which no other efficient implementation is known, such as identity based encryption or attribute based encryption schemes. A contemporary example of using bilinear pairings is exemplified in the Boneh-Lynn-Shacham signature scheme. Pairing-based cryptography relies on hardness assumptions separate from e.g. the Elliptic Curve Discrete Logarithm Problem, which is older and has been studied for a longer time. CryptanalysisIn June 2012 the National Institute of Information and Communications Technology (NICT), Kyushu University, and Fujitsu Laboratories Limited improved the previous bound for successfully computing a discrete logarithm on a supersingular elliptic curve from 676 bits to 923 bits.[4] References1. ^{{cite journal|last1=Koblitz|first1=Neal|last2=Menezes|first2=Alfred|title=Pairing-Based cryptography at high security levels|journal=LNCS|date=2005|volume=3796}} 2. ^{{cite journal|last1=Galbraith|first1=Steven|last2=Paterson|first2=Kenneth|last3=Smart|first3=Nigel|title=Pairings for Cryptographers|journal=Discrete Applied Mathematics|date=2008|volume=156|issue=16|pages=3113–3121|doi=10.1016/j.dam.2007.12.010}} 3. ^{{cite journal|last1=Menezes|first1=Alfred J. Menezes|last2=Okamato|first2=Tatsuaki|last3=Vanstone|first3=Scott A.|title=Reducing Elliptic Curve Logarithms to Logarithms in a Finite Field|journal=IEEE Transactions on Information Theory|date=1993|volume=39|issue=5}} 4. ^{{cite web |work=Press release from NICT |date=June 18, 2012 |url=http://www.nict.go.jp/en/press/2012/06/18en-1.html |title=NICT, Kyushu University and Fujitsu Laboratories Achieve World Record Cryptanalysis of Next-Generation Cryptography }} External links
2 : Elliptic curve cryptography|Pairing-based cryptography |
随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识,基本涵盖了大多数领域的百科知识,是一部内容自由、开放的电子版国际百科全书。