TOPPSS: Cost-Minimal Password-Protected Secret Sharing Based on Threshold OPRF

著者: Stanislaw Jarecki, Aggelos Kiayias, Hugo Krawczyk, Jiayu Xu - Lecture notes in computer science 2017 被引用: 67

We present TOPPSS, the most efficient Password-Protected Secret Sharing (PPSS) scheme to date. A (t, n)-threshold PPSS, introduced by Bagherzandi et al. [4], allows a user to share a secret among n servers so that the secret can later be reconstructed by the user from any subset of \(t+1\) servers with the sole knowledge of a password. It is guaranteed that any coalition of up to t corrupt servers learns nothing about the secret (or the password). In addition to providing strong protection to secrets stored online, PPSS schemes give rise to efficient Threshold PAKE (T-PAKE) protocols that armor single-server password authentication against the inherent vulnerability to offline dictionary attacks in case of server compromise.