ESCM: A Toolkit for Efficient and Secure Outsourced Computation With Multiple Keys

ESCM is a toolkit that uses homomorphic encryption (a technique that lets computers process encrypted data without decrypting it first) to let cloud servers perform calculations on data from multiple users who each have their own encryption key. The toolkit addresses security risks by using a distributed two trapdoor cryptosystem with threshold decryption (a system where multiple servers must cooperate to decrypt data, so no single server can access the information alone), which protects against server collusion and outages.