SANSCrypt: A Sporadic-Authentication-Based Sequential Logic Encryption Scheme

TL;DR

SANSCrypt introduces a novel sequential logic encryption scheme that enhances circuit protection by requiring sporadic authentications, making reverse engineering significantly more difficult and resilient against attacks.

Contribution

It proposes SANSCrypt, a new temporal logic encryption method using sporadic authentications and pseudo-random protocols, improving security over existing one-time schemes.

Findings

Offers substantial output corruptibility with incorrect key sequences.

Exhibits exponential resilience to SAT-based and other attacks.

Maintains low overhead while enhancing security.

Abstract

We propose SANSCrypt, a novel sequential logic encryption scheme to protect integrated circuits against reverse engineering. Previous sequential encryption methods focus on modifying the circuit state machine such that the correct functionality can be accessed by applying the correct key sequence only once. Considering the risk associated with one-time authentication, SANSCrypt adopts a new temporal dimension to logic encryption, by requiring the user to sporadically perform multiple authentications according to a protocol based on pseudo-random number generation. Analysis and validation results on a set of benchmark circuits show that SANSCrypt offers a substantial output corruptibility if the key sequences are applied incorrectly. Moreover, it exhibits an exponential resilience to existing attacks, including SAT-based attacks, while maintaining a reasonably low overhead.