Public-key Cryptosystems Provably Secure against Chosen Ciphertext Attacks


We show how to construct a public-key cryptosystem (as originally defined by DiNe and Hellman) secure against chosen ciphertezt attacks, given a public-key cryptosystern secure against passive eavesdropping and a noninteractive zero-knowledge proof system in the shared string model. No such secure cryptosystems were known before. A concrete implementat ion… (More)
DOI: 10.1145/100216.100273



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