Secret Handshakes from Pairing-Based Key Agreements
SP '03 Proceedings of the 2003 IEEE Symposium on Security and Privacy
Secret Handshake: Strong Anonymity Definition and Construction
ISPEC '09 Proceedings of the 5th International Conference on Information Security Practice and Experience
Secret handshake with multiple groups
WISA'06 Proceedings of the 7th international conference on Information security applications: PartI
K-anonymous multi-party secret handshakes
FC'07/USEC'07 Proceedings of the 11th International Conference on Financial cryptography and 1st International conference on Usable Security
PPAA: peer-to-peer anonymous authentication
ACNS'08 Proceedings of the 6th international conference on Applied cryptography and network security
Private discovery of common social contacts
ACNS'11 Proceedings of the 9th international conference on Applied cryptography and network security
Authentication for paranoids: multi-party secret handshakes
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
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Secret handshake protocols were recently introduced by Balfanz, et al. [1] to allow members of the same group to authenticate each other secretly, in the sense that someone who is not a group member cannot tell, by engaging in the handshake protocol, whether his counterparty is a member of the group. On the other hand, any two parties who are members of the same group will recognize each other as members. Thus, secret handshakes can be used in any scenario where group members need to identify each other without revealing their group affiliations to outsiders. The secret handshake protocol of [1] relies on a Bilinear Diffie-Hellman assumption on certain elliptic curves. We show how to build secret handshake protocols secure under more standard cryptographic assumptions, like the RSA or the Diffie Hellman (DH) assumption, using a novel tool of CA-oblivious public key encryption, i.e. an encryption scheme where neither the public key nor the ciphertext reveal any information about the Certification Authority which certified the public key.