Random oracles are practical: a paradigm for designing efficient protocols
CCS '93 Proceedings of the 1st ACM conference on Computer and communications security
An Efficient Verifiable Encryption Scheme for Encryption of Discrete Logarithms
CARDIS '98 Proceedings of the The International Conference on Smart Card Research and Applications
Separability and Efficiency for Generic Group Signature Schemes
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
On Concrete Security Treatment of Signatures Derived from Identification
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
An Efficient System for Non-transferable Anonymous Credentials with Optional Anonymity Revocation
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
ASIACRYPT '01 Proceedings of the 7th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
Publicly verifiable secret sharing
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Security proofs for signature schemes
EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
Public-key cryptosystems based on composite degree residuosity classes
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Custodian-hiding verifiable encryption
WISA'04 Proceedings of the 5th international conference on Information Security Applications
Publicly Verifiable Privacy-Preserving Group Decryption
Information Security and Cryptology
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We propose an efficient Verifiable Ring Encryption (VRE) for ad hoc groups. VRE is a kind of verifiable encryption [16,1,4,2,8] in which it can be publicly verified that there exists at least one user, out of a designated group of n users, who can decrypt the encrypted message, while the semantic security of the message and the anonymity of the actual decryptor can be maintained. This concept was first proposed in [10] in the name of Custodian-Hiding Verifiable Encryption. However, their construction requires the inefficient cut-and-choose methodology which is impractical when implemented. We are the first to propose an efficient VRE scheme that does not require the cut-and-choose methodology. In addition, while [10] requires interaction with the encryptor when a verifier verifies a ciphertext, our scheme is non-interactive in the following sense: (1) an encryptor does not need to communicate with the users in order to generate a ciphertext together with its validity proof; and (2) anyone (who has the public keys of all users) can verify the ciphertext, without the help of the encryptor or any users. This non-interactiveness makes our scheme particularly suitable for ad hoc networks in which nodes come and go frequently as ciphertexts can be still generated and/or verified even if other parties are not online in the course. Our scheme is also proven secure in the random oracle model.