The Oracle Diffie-Hellman Assumptions and an Analysis of DHIES
CT-RSA 2001 Proceedings of the 2001 Conference on Topics in Cryptology: The Cryptographer's Track at RSA
Efficient Identification and Signatures for Smart Cards
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
Analysis of Key-Exchange Protocols and Their Use for Building Secure Channels
EUROCRYPT '01 Proceedings of the International Conference on the Theory and Application of Cryptographic Techniques: Advances in Cryptology
Key Agreement Protocols and Their Security Analysis
Proceedings of the 6th IMA International Conference on Cryptography and Coding
Secret Handshakes from Pairing-Based Key Agreements
SP '03 Proceedings of the 2003 IEEE Symposium on Security and Privacy
k-anonymous secret handshakes with reusable credentials
Proceedings of the 11th ACM conference on Computer and communications security
Unlinkable Secret Handshakes and Key-Private Group Key Management Schemes
ACNS '07 Proceedings of the 5th international conference on Applied Cryptography and Network Security
Secret Handshake: Strong Anonymity Definition and Construction
ISPEC '09 Proceedings of the 5th International Conference on Information Security Practice and Experience
Private Mutual Authentication and Conditional Oblivious Transfer
CRYPTO '09 Proceedings of the 29th Annual International Cryptology Conference on Advances in Cryptology
Proving in zero-knowledge that a number is the product of two safe primes
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Beyond secret handshakes: affiliation-hiding authenticated key exchange
CT-RSA'08 Proceedings of the 2008 The Cryptopgraphers' Track at the RSA conference on Topics in cryptology
Affiliation-hiding key exchange with untrusted group authorities
ACNS'10 Proceedings of the 8th international conference on Applied cryptography and network security
WCC'05 Proceedings of the 2005 international conference on Coding and Cryptography
A flexible framework for secret handshakes
PET'06 Proceedings of the 6th international conference on Privacy Enhancing Technologies
Authentication for paranoids: multi-party secret handshakes
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
Group secret handshakes or affiliation-hiding authenticated group key agreement
CT-RSA'07 Proceedings of the 7th Cryptographers' track at the RSA conference on Topics in Cryptology
Practical affiliation-hiding authentication from improved polynomial interpolation
Proceedings of the 6th ACM Symposium on Information, Computer and Communications Security
Affiliation-hiding authentication with minimal bandwidth consumption
WISTP'11 Proceedings of the 5th IFIP WG 11.2 international conference on Information security theory and practice: security and privacy of mobile devices in wireless communication
Private discovery of common social contacts
ACNS'11 Proceedings of the 9th international conference on Applied cryptography and network security
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In Secret Handshakes (SH) and Affiliation-Hiding Authenticated Key Exchange (AH-AKE) schemes, users become group members by registering with Group Authorities (GAs) and obtaining membership credentials. Group members then use their membership credentials to privately authenticate each other and communicate securely. The distinguishing privacy property of SH and AH-AKE is that parties learn each other's groups affiliations and compute common session keys only if their groups match. Current SH and AH-AKE schemes consider GAs to be fully trusted, especially, with regard to (i) security of the registration phase (no phantom members), (ii) secrecy of established session keys, and (iii) privacy. The impact of possible "big brother" ambitions of malicious GAs has not been investigated so far. In this paper, we discuss implications on group members' privacy and security of their communication in the presence of possible GA corruptions. We demonstrate problems arising from relaxed GA trust assumptions and propose an efficient -- yet provably secure -- AH-AKE protocol with enhanced privacy properties.