Paper 2021/1535

Light-OCB: Parallel Lightweight Authenticated Cipher with Full Security

Avik Chakraborti, Nilanjan Datta, Ashwin Jha, Cuauhtemoc Manicillas Lopez, and Mridul Nandi


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.

Available format(s)
Secret-key cryptography
Publication info
Preprint. MINOR revision.
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
2021-11-22: received
Short URL
Creative Commons Attribution


      author = {Avik Chakraborti and Nilanjan Datta and Ashwin Jha and Cuauhtemoc Manicillas Lopez and Mridul Nandi},
      title = {Light-OCB: Parallel Lightweight Authenticated Cipher with Full Security},
      howpublished = {Cryptology ePrint Archive, Paper 2021/1535},
      year = {2021},
      note = {\url{}},
      url = {}
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