Efficient Batch Threshold Encryption Using Partial Fraction Techniques

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Batch encryption enables a holder of the secret key to publish a succinct pre-decryption key for a set of ciphertexts, such that exactly that set can be decrypted while other ciphertexts remain secret. Existing constructions either rely on epochs or, when epochless, suffer from large public parameters (quadratic in the batch size) and are vulnerable to censorship. In this work, we present an epochless, censorship-resistant batch encryption scheme with linear-sized public parameters, constant-siz