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The authors put forth the notion of efficient dual receiver cryptosystems and implement it based on bilinear pairings over certain elliptic curve groups. The cryptosystem is simple and efficient yet powerful, as it helps to solve two problems of practical importance whose solutions had proven to be elusive until now: A provably secure "Combined" public-key cryptosystem (with a single secret key per user) where the key is used for both decryption and signing and where encryption can be escrowed and recovered, while the signature capability never leaves its owner.
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