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In this paper, the authors propose a new cryptographic primitive called Delegatable Homomorphic Encryption (DHE). This allows a trusted authority to control/delegate the capability to evaluate circuits over encrypted data to untrusted workers/evaluators by issuing tokens. This primitive can be both seen as a public-key counterpart to verifiable computation, where input generation and output verification are performed by different entities, or as a generalisation of fully homomorphic encryption enabling control over computations on encrypted data.
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