Cryptology ePrint Archive: Report 2015/1064

Déjà Q: Encore! Un Petit IBE

Hoeteck Wee

Abstract: We present an identity-based encryption (IBE) scheme in composite-order bilinear groups with essentially optimal parameters: the ciphertext overhead and the secret key are one group element each and decryption requires only one pairing. Our scheme achieves adaptive security and anonymity under standard decisional subgroup assumptions as used in Lewko and Waters (TCC '10). Our construction relies on a novel extension to the Deja Q framework of Chase and Meiklejohn (Eurocrypt '14).

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Original Publication (in the same form): IACR-TCC-2016

Date: received 30 Oct 2015

Contact author: wee at di ens fr

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Version: 20151102:111345 (All versions of this report)

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