Homomorphic Signature-based Witness Encryption and Applications

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Signature-based witness encryption (SWE) schemes recently emerged as a viable alternative to instantiate timed-release cryptography in the honest majority setting. In particular, assuming threshold trust in a set of parties that release signatures at a specified time, one can ``encrypt to the future'' using an SWE scheme. It offers stateless decryption, where parties producing the signatures do not need to know the ciphertexts in advance to perform decryption. This statelessness makes SWE vastly