Breaking Encrypted Mempool Limitations with Advanced Cryptography

Advanced cryptographic primitives can address three limitations of threshold-encrypted mempools: collusion among Keypers, costly fixed Keyper sets, and decryption latency. Accountability schemes deter collusion, including secret sharing with snitching from Dziembowski et al. and traceable threshold encryption from Boneh et al., where Canard et al. add public tracing that smart contracts can enforce. Garg et al. propose threshold encryption with silent setup, in which each Keyper publishes a hint so Keypers can join or leave without a global DKG rerun. Choudhuri et al. proposed batched threshold encryption, which gives constant-sized decryption data per block, though these constructions are not yet production-ready.