570 search results - page 34 / 114 » Black-box constructions for secure computation |
149
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CCS
2007
ACM
15 years 11 months ago
2007
ACM
We construct two new multiparty digital signature schemes that allow multiple signers to sequentially produce a compact, fixed-length signature. First, we introduce a new primiti...
128
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ICALP
2005
Springer
15 years 11 months ago
2005
Springer
At TCC 2005, Backes and Cachin proposed a new and very strong notion of security for public key steganography: secrecy against adaptive chosen covertext attack (SS-CCA); and posed ...
147
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ASIACRYPT
2007
Springer
15 years 11 months ago
2007
Springer
Abstract. Whereas encryption schemes withstanding passive chosenplaintext attacks (CPA) can be constructed based on a variety of computational assumptions, only a few assumptions a...
161
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EUROCRYPT
2003
Springer
15 years 10 months ago
2003
Springer
We introduce captcha, an automated test that humans can pass, but current computer programs can’t pass: any program that has high success over a captcha can be used to solve an u...
150
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DANCE
2002
IEEE
15 years 10 months ago
2002
IEEE
In this paper we define and provide a general construction for a class of policies we call dynamic policies. In most existing systems, policies are implemented and enforced by ch...