Paper 2021/1535
Light-OCB: Parallel Lightweight Authenticated Cipher with Full Security
Avik Chakraborti and Nilanjan Datta and Ashwin Jha and Cuauhtemoc Manicillas Lopez and Mridul Nandi
Abstract
This paper proposes a lightweight authenticated encryption (AE) scheme, called Light-OCB, which can be viewed as a lighter variant of the CAESAR winner OCB as well as a faster variant of the high profi le NIST LWC competition submission LOCUS-AEAD. Light-OCB is structurally similar to LOCUS-AEAD and uses a nonce-based derived key that provides optimal security, and short-tweak tweakable blockcipher (tBC) for efficient domain separation. Light-OCB improves over LOCUS-AEAD by reducing the number of primitive calls, and thereby signi ficantly optimizing the throughput. To establish our claim, we provide FPGA hardware implementation details and benchmark for Light-OCB against LOCUS-AEAD and several other well-known AEs. The implementation results depict that, when instantiated with the tBC TweGIFT64, Light-OCB achieves an extremely low hardware footprint - consuming only around 1128 LUTs and 307 slices (signifi cantly lower than that for LOCUS-AEAD) while maintaining a throughput of 880 Mbps, which is almost twice as that of LOCUS-AEAD. To the best of our knowledge, this fi gure is signi ficantly better than all the known implementation results of other lightweight ciphers with parallel structures.
Metadata
- Available format(s)
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- Authenticated EncryptionlightweighttBCLight-OCBparallel
- Contact author(s)
- avikchkrbrti @ gmail com,nilanjan datta @ tcgcrest org,ashwin jha @ cispa de,cuauhtemoc mancillas @ cinvestav mx,mridul nandi @ gmail com
- History
- 2021-11-22: received
- Short URL
- https://ia.cr/2021/1535
- License
-
CC BY