TY - GEN
T1 - Anonymously Publishing Liveness Signals with Plausible Deniability
AU - Sonntag, Michael
AU - Mayrhofer, Rene
AU - Rass, Stefan
PY - 2023/12
Y1 - 2023/12
N2 - Sometimes entities have to prove to others that they are still alive at a certain point in time, but with the added requirements of anonymity and plausible deniability; examples for this are whistleblowers or persons in dangerous situations. We propose a system to achieve this via hash chains and publishing liveness signals on Tor onion services. Even if one participant is discovered and (made to) cooperate, others still enjoy plausible deniability. To support arbitrary numbers of provers on a potentially limited list of online storage services, an additional “key” distinguishes multiple provers. This key should neither be static nor predictable to third parties, and provide forward secrecy. We propose both a derivation from user-memorable passwords and an initial pairing step to transfer unique key material between prover and verifier. In addition to describing the protocol, we provide an open source App implementation and evaluate its performance.
AB - Sometimes entities have to prove to others that they are still alive at a certain point in time, but with the added requirements of anonymity and plausible deniability; examples for this are whistleblowers or persons in dangerous situations. We propose a system to achieve this via hash chains and publishing liveness signals on Tor onion services. Even if one participant is discovered and (made to) cooperate, others still enjoy plausible deniability. To support arbitrary numbers of provers on a potentially limited list of online storage services, an additional “key” distinguishes multiple provers. This key should neither be static nor predictable to third parties, and provide forward secrecy. We propose both a derivation from user-memorable passwords and an initial pairing step to transfer unique key material between prover and verifier. In addition to describing the protocol, we provide an open source App implementation and evaluate its performance.
UR - http://www.scopus.com/inward/record.url?scp=85178666045&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-48348-6_1
DO - 10.1007/978-3-031-48348-6_1
M3 - Conference proceedings
SN - 978-3-031-48347-9
VL - 14417
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 3
EP - 19
BT - Advances in Mobile Computing and Multimedia Intelligence - 21st International Conference, MoMM 2023, Proceedings
A2 - Delir Haghighi, Pari
A2 - Pardede, Eric
A2 - Dobbie, Gillian
A2 - Yogarajan, Vithya
A2 - ER, Ngurah Agus Sanjaya
A2 - Kotsis, Gabriele
A2 - Khalil, Ismail
PB - Springer
CY - Cham, Switzerland
ER -