XMR Wallet Decoy Selection Bias: Why Your Ring Signature Privacy Degrades Over Time
A Monero user has operated the same wallet for eighteen months, sending regular payments to merchants, exchanges, and peers. Each transaction includes ring signatures with decoys—unspent outputs mixed into the transaction to obscure which output is actually being spent. The cryptography itself remains sound. Yet an adversary analyzing the wallet’s transaction history notices something troubling: … Read more