Circular-Secure Encryption from Decision Diffie-Hellman

@inproceedings{Boneh2008CircularSecureEF,
  title={Circular-Secure Encryption from Decision Diffie-Hellman},
  author={Dan Boneh and Shai Halevi and Michael Hamburg and Rafail Ostrovsky},
  booktitle={CRYPTO},
  year={2008}
}
Let E be a public-key encryption system and let (pki, ski) be public/private key pairs for E for i = 0, . . . , n. A natural question is whether E remains secure once an adversary obtains an encryption cycle, which consists of the encryption of ski under pk(i mod n)+1 for all i = 1, . . . , n. Surprisingly, even strong notions of security such as chosen-ciphertext security appear to be insufficient for proving security in these settings. Since encryption cycles come up naturally in several… CONTINUE READING
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