Security

Achieving Short Ciphertexts or Short Secret-Keys for Adaptively Secure General Inner-Product Encryption

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Executive Summary

In this paper, the authors present two Non-zero Inner-Product Encryption (NIPE) schemes that are adaptively secure under a standard assumption, the Decisional LINear (DLIN) assumption, in the standard model. One of the proposed NIPE schemes features constant-size ciphertexts and the other features constant-size secret-keys. Their NIPE schemes imply an Identity-Based Revocation (IBR) system with constant-size ciphertexts or constant-size secret-keys that is adaptively secure under the DLIN assumption. Any previous IBR scheme with constant-size ciphertexts or constant-size secret-keys was not adaptively secure in the standard model.

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