Encrypt Flip-Flop: A Novel Logic Encryption Technique For Sequential Circuits

01/15/2018
by   Rajit Karmakar, et al.
0

Logic Encryption is one of the most popular hardware security techniques which can prevent IP piracy and illegal IC overproduction. It introduces obfuscation by inserting some extra hardware into a design to hide its functionality from unauthorized users. Correct functionality of an encrypted design depends upon the application of correct keys, shared only with the authorized users. In the recent past, extensive efforts have been devoted in extracting the secret key of an encrypted design. At the same time, several countermeasures have also been proposed by the research community to thwart different state-of-the-art attacks on logic encryption. However, most of the proposed countermeasures fail to prevent the powerful SAT attack. Although a few researchers have proposed different solutions to withstand SAT attack, those solutions suffer from several drawbacks such as high design overheads, low output corruptibility, and vulnerability against removal attack. Almost all the known logic encryption strategies are vulnerable to scan based attack. In this paper, we propose a novel encryption technique called Encrypt Flip-Flop, which encrypts the outputs of selected flip-flops by inserting multiplexers (MUX). The proposed strategy can thwart all the known attacks including SAT and scan based attacks. The scheme has low design overhead and implementation complexity. Experimental results on several ISCAS'89 and ITC'99 benchmarks show that our proposed method can produce reasonable output corruption for wrong keys.

READ FULL TEXT
research
08/10/2021

Fun-SAT: Functional Corruptibility-Guided SAT-Based Attack on Sequential Logic Encryption

The SAT attack has shown to be efficient against most combinational logi...
research
09/21/2020

Modeling Techniques for Logic Locking

Logic locking is a method to prevent intellectual property (IP) piracy. ...
research
05/28/2021

The Unpatchable Silicon: A Full Break of the Bitstream Encryption of Xilinx 7-Series FPGAs

The security of FPGAs is a crucial topic, as any vulnerability within th...
research
10/08/2021

Hardware Functional Obfuscation With Ferroelectric Active Interconnects

Camouflaging gate techniques are typically used in hardware security to ...
research
10/11/2020

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

We propose SANSCrypt, a novel sequential logic encryption scheme to prot...
research
03/08/2018

Deep RNN-Oriented Paradigm Shift through BOCANet: Broken Obfuscated Circuit Attack

This is the first work augmenting hardware attacks mounted on obfuscated...
research
09/15/2019

A Vector Space Approach to Generate Dynamic Keys for Hill Cipher

In this paper a variant of the Hill cipher is proposed. In the classical...

Please sign up or login with your details

Forgot password? Click here to reset