Multi-Party Threshold Cryptography
Christian Cachin · 2023
Abstract In a threshold cryptosystem, the private key is typically distributed among parties that constitute the system using cryptographically secure secret sharing. Particular focus must be placed on generating the private key held jointly by the parties. Up to F of the parties might be faulty and leak their key shares, but F + 1 must cooperate in executing a cryptographic operation. Standards for threshold cryptography and the corresponding open-source implementations are expected to emerge because of the multi-year efforts driven by governmental or private-sector standardization agencies. For building secure distributed systems that can survive a partial corruption of their components, multi-party threshold cryptography plays an important role.