Paper 2025/2231

NeevAs: An AEAD Design for Lightweight Cryptography

, Society for Electronic Transactions and Security (SETS) (Under O/o PSA to GOI) Taramani, Chennai -600113 India

Hari Preeth S, Society for Electronic Transactions and Security (SETS) (Under O/o PSA to GOI) Taramani, Chennai -600113 India

Khushboo Bussi, C-DAC Hyderabad

Shashi Kant Pandey, Society for Electronic Transactions and Security (SETS) (Under O/o PSA to GOI) Taramani, Chennai -600113 India

Abstract

Authenticity and confidentiality are crucial for maintaining a secure information infrastructure. Confidentiality prevents unauthorized disclosure, while authenticity ensures origin of the data.. Authenticated encryption ensures both simultaneously by protecting data from access and verifying integrity. This paper presents a NeevAs cipher suite offering authenticated encryption with associated data (AEAD) and hashing, based on a sponge-based duplex construction. The scheme included concurrent absorption, a novel sponge method, where associated data is absorbed into the capacity part and plaintext into the rate part simultaneously. This reduces permutation calls typically required for associated data processing compared to existing sponge based designs. In the NeevAs cipher suite, the modified Neeva hash function generates the security tag, and the Ascon S-box provides efficiency and resistance against differential and boomerang attacks. The design targets lightweight cryptography, minimizing permutation calls to enhance efficiency and reduce resource consumption, making it well-suited for resource-constrained devices.

@misc{cryptoeprint:2025/2231,
      author = {Varsha Jarali and Hari Preeth S and Khushboo Bussi and Shashi Kant Pandey},
      title = {{NeevAs}: An {AEAD} Design for Lightweight Cryptography},
      howpublished = {Cryptology {ePrint} Archive, Paper 2025/2231},
      year = {2025},
      url = {https://eprint.iacr.org/2025/2231}
}