Cryptology ePrint Archive: Report 2016/1030

Novel Inner Product Encryption Resistant to Partial Collusion Attacks

Yuqiao Deng, Ge Song

Abstract: Inner product encryption (IPE) is a new cryptographic primitive initially proposed by Abdalla et al. in 2015. IPE can be classified into public-key IPE and secret-key IPE. The currently proposed PK-IPE schemes can-not resist the following collusion attack: an invalid user that holds no private key can ”buy” a combined key generated from multiple collusion adversaries, and the user can use this private key to decrypt a ciphertext. Furthermore, the user should not let the collusion adversaries know the ciphertext, and the collusion adversaries should not let the user learn their private keys. We present a new PK-IPE to resist such collusion attack. Our PK-IPE is proven secure under the selective-vector chosen-plaintext attack model. We formalize a selective vector collusion attack model to prove that our scheme is secure under this model.

Category / Keywords: public-key cryptography / Inner Product Encryption, Selective Security, Bilinear Paring, TCA, PCA

Date: received 30 Oct 2016

Contact author: 425478541 at qq com

Available format(s): PDF | BibTeX Citation

Version: 20161101:021027 (All versions of this report)

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