Identity-Based Encryption from the Weil Pairing
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Proceedings of the 13th ACM conference on Computer and communications security
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Proceedings of the 14th ACM conference on Computer and communications security
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TCC'07 Proceedings of the 4th conference on Theory of cryptography
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EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
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ASIACRYPT'07 Proceedings of the Advances in Crypotology 13th international conference on Theory and application of cryptology and information security
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EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Fuzzy identity-based encryption
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
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EuroPKI'09 Proceedings of the 6th European conference on Public key infrastructures, services and applications
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WISTP'10 Proceedings of the 4th IFIP WG 11.2 international conference on Information Security Theory and Practices: security and Privacy of Pervasive Systems and Smart Devices
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The fuzzy identity-based encryption schemes are attribute-basedencryption schemes such that each party with the private key for anattribute set $\mathcal{S}$ is allowed to decrypt ciphertextsencrypted by an attribute set $\mathcal{S}'$, if and only if thetwo sets $\mathcal{S}$ and $\mathcal{S}'$ are close to each otheras measured by the set-overlap-distance metric. That is, there is athreshold t and, if t out of n attributes of $\mathcal{S}$ are also included in $\mathcal{S}'$,the receivers can decrypt the ciphertexts. In previous schemes,this threshold t is fixed when private keys are generatedand the length of ciphertexts are linear to n . In thispaper, we propose a novel fuzzy identity-based encryption schemewhere the threshold t is flexible by nature and the lengthof ciphertexts are linear to n - t . The latterproperty makes the scheme short if it allows receivers to decryptciphertexts when error rate n - t , i.e., distancebetween the two attribute sets, is low.