A randomized protocol for signing contracts
Communications of the ACM
Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
Identity-Based Encryption from the Weil Pairing
SIAM Journal on Computing
Identity-Based Encryption from the Weil Pairing
CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
Toward Hierarchical Identity-Based Encryption
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
Hierarchical ID-Based Cryptography
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
An Identity Based Encryption Scheme Based on Quadratic Residues
Proceedings of the 8th IMA International Conference on Cryptography and Coding
Attribute-based encryption for fine-grained access control of encrypted data
Proceedings of the 13th ACM conference on Computer and communications security
Attribute-based encryption with non-monotonic access structures
Proceedings of the 14th ACM conference on Computer and communications security
Simulatable Adaptive Oblivious Transfer
EUROCRYPT '07 Proceedings of the 26th annual international conference on Advances in Cryptology
Bounded Ciphertext Policy Attribute Based Encryption
ICALP '08 Proceedings of the 35th international colloquium on Automata, Languages and Programming, Part II
Black-box accountable authority identity-based encryption
Proceedings of the 15th ACM conference on Computer and communications security
Hierarchical Identity Based Encryption with Polynomially Many Levels
TCC '09 Proceedings of the 6th Theory of Cryptography Conference on Theory of Cryptography
Towards Black-Box Accountable Authority IBE with Short Ciphertexts and Private Keys
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
EUROCRYPT '09 Proceedings of the 28th Annual International Conference on Advances in Cryptology: the Theory and Applications of Cryptographic Techniques
Reducing trust in the PKG in identity based cryptosystems
CRYPTO'07 Proceedings of the 27th annual international cryptology conference on Advances in cryptology
Blind identity-based encryption and simulatable oblivious transfer
ASIACRYPT'07 Proceedings of the Advances in Crypotology 13th international conference on Theory and application of cryptology and information security
Efficient fully-simulatable oblivious transfer
CT-RSA'08 Proceedings of the 2008 The Cryptopgraphers' Track at the RSA conference on Topics in cryptology
Fully secure functional encryption with general relations from the decisional linear assumption
CRYPTO'10 Proceedings of the 30th annual conference on Advances in cryptology
Efficient identity-based encryption without random oracles
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
EUROCRYPT'10 Proceedings of the 29th Annual international conference on Theory and Applications of Cryptographic Techniques
Practical identity-based encryption without random oracles
EUROCRYPT'06 Proceedings of the 24th annual international conference on The Theory and Applications of Cryptographic Techniques
Accountable authority identity-based encryption with public traceability
CT-RSA'13 Proceedings of the 13th international conference on Topics in Cryptology
How to keep a secret: leakage deterring public-key cryptosystems
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
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The problem of trust is one of the biggest concerns in any identity-based infrastructure where the key-generation authority (called the PKG) must choose secret keys for participants and therefore be highly trusted by all parties. While some abilities of the PKG are intrinsic to this setting, reducing this trust as much as possible is beneficial to both user and authority as the less trust is placed in it, the less an honest authority can be accused of abusing that trust. Goyal (CRYPTO 2007) defined the notion of Accountable-Authority IBE in which a dishonest PKG who had leaked a user's private key could be proven guilty. Later, Goyal et al. (CCS 2008) asked whether it would be possible to implicate a PKG who produced an unauthorized decoder box, enabling decryption with a noticeable probability but which may not actually grant access to a well-formed key. Formally, would it be possible for a tracing algorithm to implicate a dishonest PKG given only black-box access to such a decoder? Goyal et al. could only provide such a scheme in the weaker setting of selective security, where an adversary must declare at the start of the game which identity it intends to target. In this work, we provide the first fully secure accountable-authority IBE scheme. We prove security from the standard DBDH assumption while losing none of the functionality or security of the original proposal.