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Erschienen in:
2015 | OriginalPaper | Buchkapitel
TriviA: A Fast and Secure Authenticated Encryption Scheme
verfasst von : Avik Chakraborti, Anupam Chattopadhyay, Muhammad Hassan, Mridul Nandi
Erschienen in: Cryptographic Hardware and Embedded Systems -- CHES 2015
Verlag: Springer Berlin Heidelberg
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Abstract
In this paper, we propose a new hardware friendly authenticated encryption (AE) scheme \({\textsf {TriviA}}\) based on (i) a stream cipher for generating keys for the ciphertext and the tag, and (ii) a pairwise independent hash to compute the tag. We have adopted one of the ISO-standardized stream ciphers for lightweight cryptography, namely
Trivium
, to obtain our underlying stream cipher. This new stream cipher has a state that is a little larger than the state of Trivium to accommodate a 128-bit secret key and IV. Our pairwise independent hash is also an adaptation of the
EHC or “Encode-Hash-Combine” hash, that requires the optimum number of field multiplications and hence requires small hardware footprint. We have implemented the design in synthesizable RTL. Pre-layout synthesis, using 65 nm standard cell technology under typical operating conditions, reveals that \({\textsf {TriviA}}\) is able to achieve a high throughput of 91.2 Gbps for an area of 24.4 KGE. We prove that our construction has at least 128-bit security for privacy and 124-bit security of authenticity under the assumption that the underlying stream cipher produces a pseudorandom bit stream.