OSPEAD (Optimal Ring Signature Research) is a recent study (April 2025) that measures anonymity efficiency and detected a risk: the attacker could guess the anonymous signature in 1 out of 4.2 cases instead of 1/16.
But beware: this is only a theoretical finding. So far, an "ospead fix" has not been implemented, because it would involve a hard fork, and the intention is to resolve it in a more comprehensive way with FCMP++.
So:
OSPEAD illustrates a real vulnerability in the selection of decoys, but there is still no technical solution in production.
The definitive solution will be part of FCMP++, which will robustly solve the modeling and privacy issues (and will arrive when the code is fully audited and tested).
https://www.getmonero.org/2025/04/05/ospead-optimal-ring-signature-research.html?utm_source=chatgpt.com
Li₿ΞʁLiøη 🏴a³
npub1wp…hzs7p
2025-06-09 17:31:00
in reply to nevent1q…k2ew
Author Public Key
npub1wpzpvzfkn4m754fasp0wnt6ck20ycww4kz9nj4n5rquu9ul7a0xq4hzs7pPublished at
2025-06-09 17:31:00Event JSON
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"created_at": 1749490260,
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"content": "OSPEAD (Optimal Ring Signature Research) is a recent study (April 2025) that measures anonymity efficiency and detected a risk: the attacker could guess the anonymous signature in 1 out of 4.2 cases instead of 1/16.\n\nBut beware: this is only a theoretical finding. So far, an \"ospead fix\" has not been implemented, because it would involve a hard fork, and the intention is to resolve it in a more comprehensive way with FCMP++.\n\nSo:\n\nOSPEAD illustrates a real vulnerability in the selection of decoys, but there is still no technical solution in production.\n\nThe definitive solution will be part of FCMP++, which will robustly solve the modeling and privacy issues (and will arrive when the code is fully audited and tested).\n\nhttps://www.getmonero.org/2025/04/05/ospead-optimal-ring-signature-research.html?utm_source=chatgpt.com",
"sig": "96ddfb814cf730f4d1923c34872fa60612e6b4c14e1138cd46d16fe8ab9a106422255af0c87287b147bf8beb83037a361a284f86fff14c7bebd2967ab7a7e63e"
}