NTRUCipher-Lattice Based Secret Key Encryption
This work addresses a gap in lattice-based cryptography for secret key encryption, but it is incremental as it adapts an existing NTRU framework.
The authors tackled the lack of a secret key encryption scheme based on NTRU lattices by proposing NTRUCipher, a modification of NTRU public key encryption, and showed it is secure under indistinguishability chosen plaintext attack.
NTRU cryptosystem has allowed designing a range of cryptographic schemes due to its flexibility and efficiency. Although NTRU cryptosystem was introduced nearly two decades ago, it has not yet received any attention like designing a secret key encryption. In this paper, we propose a secret key encryption over NTRU lattices, named as NTRUCipher. This NTRUCipher is designed using modification of the NTRU public key encryption. We analyze this cipher efficiency and the space complexity with respect to security aspects, and also show that the NTRUCipher is secured under the indistinguishability chosen plaintext attack.