TY - CHAP

T1 - On the random-oracle methodology as applied to length-restricted signature schemes

AU - Canetti, Ran

AU - Goldreich, Oded

AU - Halevi, Shai

PY - 2004

Y1 - 2004

N2 - In earlier work, we described a "pathological" example of a signature scheme that is secure in the Random Oracle Model, but for which no secure implementation exists. For that example, however, it was crucial that the scheme is able to sign "long messages" (i.e., messages whose length is not a-priori bounded). This left open the possibility that the Random Oracle Methodology is sound with respect to signature schemes that sign only "short" messages (i.e., messages of a-priori bounded length, smaller than the length of the keys in use), and are "memoryless" (i.e., the only thing kept between different signature generations is the initial signing-key). In this work, we extend our negative result to address such signature schemes. A key ingredient in our proof is a new type of interactive proof systems, which may be of independent interest.

AB - In earlier work, we described a "pathological" example of a signature scheme that is secure in the Random Oracle Model, but for which no secure implementation exists. For that example, however, it was crucial that the scheme is able to sign "long messages" (i.e., messages whose length is not a-priori bounded). This left open the possibility that the Random Oracle Methodology is sound with respect to signature schemes that sign only "short" messages (i.e., messages of a-priori bounded length, smaller than the length of the keys in use), and are "memoryless" (i.e., the only thing kept between different signature generations is the initial signing-key). In this work, we extend our negative result to address such signature schemes. A key ingredient in our proof is a new type of interactive proof systems, which may be of independent interest.

UR - http://www.scopus.com/inward/record.url?scp=35048875340&partnerID=8YFLogxK

U2 - 10.1007/978-3-540-24638-1_3

DO - 10.1007/978-3-540-24638-1_3

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AN - SCOPUS:35048875340

SN - 3540210008

SN - 9783540210009

T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

SP - 40

EP - 57

BT - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

A2 - Naor, Moni

PB - Springer Verlag

ER -