Samenvatting
We show that the Winternitz one-time signature scheme is existentially unforgeable under adaptive chosen message attacks when instantiated with a family of pseudo random functions. Compared to previous results, which require a collision resistant hash function, our result provides significantly smaller signatures at the same security level. We also consider security in the strong sense and show that the Winternitz one-time signature scheme is strongly unforgeable assuming additional properties of the pseudo random function. In this context we formally define several key-based security notions for function families and investigate their relation to pseudorandomness. All our reductions are exact and in the standard model and can directly be used to estimate the output length of the hash function required to meet a certain security level.
Originele taal-2 | Engels |
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Titel | Progress in Cryptology – AFRICACRYPT 2011 |
Subtitel | 4th International Conference on Cryptology in Africa, Dakar, Senegal, July 5-7, 2011 Proceedings |
Redacteuren | A. Nitaj, D. Pointcheval |
Plaats van productie | Berlin |
Uitgeverij | Springer |
Pagina's | 363-378 |
Aantal pagina's | 16 |
ISBN van geprinte versie | 9783642219689 |
DOI's | |
Status | Gepubliceerd - 2011 |
Extern gepubliceerd | Ja |
Evenement | 4th International Conference on the Theory and Application of Cryptographic Techniques in Africa (Africacrypt 2011) - Dakar, Senegal Duur: 5 jul. 2011 → 7 jul. 2011 Congresnummer: 4 |
Publicatie series
Naam | Lecture Notes in Computer Science |
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Volume | 6737 |
ISSN van geprinte versie | 03029743 |
ISSN van elektronische versie | 16113349 |
Congres
Congres | 4th International Conference on the Theory and Application of Cryptographic Techniques in Africa (Africacrypt 2011) |
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Verkorte titel | Africacrypt 2011 |
Land/Regio | Senegal |
Stad | Dakar |
Periode | 5/07/11 → 7/07/11 |