Low Cost Functional Obfuscation of Reusable IP Cores Used in CE Hardware Through Robust Locking

Sengupta, Anirban; Kachave, Deepak; Roy, Dipanjan

doi:10.1109/tcad.2018.2818720

Cited by 16 publications

(80 citation statements)

References 26 publications

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“…However, some advances on functional obfuscation of combinational circuits are also highlighted. Little literature is available on functional obfuscation of DSP cores such as [10], [12], and [13]. Approaches [10], [13] have proposed functional obfuscation of DSP cores using IP core locking blocks (ILBs) and Advanced Encryption Standard (AES).…”

Section: Related Work a Comparison With Prior Workmentioning

confidence: 99%

“…Little literature is available on functional obfuscation of DSP cores such as [10], [12], and [13]. Approaches [10], [13] have proposed functional obfuscation of DSP cores using IP core locking blocks (ILBs) and Advanced Encryption Standard (AES). These works are somewhat capable to defend against key-sensitization attack and removal attack, but at the expense of huge power/cost overhead.…”

Section: Related Work a Comparison With Prior Workmentioning

confidence: 99%

“…On the contrary, proposed SHA-512 based key encryption hardware used in an obfuscated DSP design is capable to defend against removal attack completely as well as other attacks such as key-sensitization, as opposed to [12] that is only capable to defend against key sensitization attack. Further, proposed SHA-512 based key encryption hardware is more robust against removal attack, key sensitization attack and is able to provide concurrent encryption of innumerable ILBs (resulting into enhanced security) in an obfuscated design compared to [10] and [13]. Besides, Besides, SHA-512 based key encryption hardware utilizes lesser number of gates /lower power compared to AES hardware used in [10] and [13] during functional obfuscation.…”

Section: Related Work a Comparison With Prior Workmentioning

confidence: 99%

“…Further, proposed SHA-512 based key encryption hardware is more robust against removal attack, key sensitization attack and is able to provide concurrent encryption of innumerable ILBs (resulting into enhanced security) in an obfuscated design compared to [10] and [13]. Besides, Besides, SHA-512 based key encryption hardware utilizes lesser number of gates /lower power compared to AES hardware used in [10] and [13] during functional obfuscation.…”

Section: Related Work a Comparison With Prior Workmentioning

confidence: 99%

“…• The proposed functional obfuscation methodology with the SHA 512 based key encryption custom hardware incurs lower gate count, lower power and improves security compared to [10]. The paper is organised as follows: Section I discusses the introduction, Section II presents related work.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Security of Functionally Obfuscated DSP Core Against Removal Attack Using SHA-512 Based Key Encryption Hardware

Sengupta¹,

Rathor²

2019

IEEE Access

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Digital signal processing (DSP) kernel-based intellectual property (IP) core forms an integral ingredient of consumer electronics devices. Thus, protection of these IP cores against reverse engineering attack is crucial. Functional obfuscation serves as a powerful mechanism to counter this hardware threat. However, functional obfuscation methodologies for DSP cores use security logics that are not lightweight and are prone to removal attack by an adversary. This paper presents a novel security mechanism for protecting functionally obfuscated DSP core against removal attack using low-cost, low-power key encryption hardware. The proposed methodology using lightweight secure hashing algorithm (SHA-512)-based key encryption custom hardware reconfigures the key-bits (resulting into structural reconfiguration) of the locking logic in a functionally obfuscated DSP design augmented with the complete logic synthesis of the design. This hinders the detection of the locking logic in the obfuscated design due to camouflaging. The proposed mechanism integrated with the functional obfuscation framework yielded lower power, lower gate count, and enhanced security compared with an existing approach. An average reduction of 25.86 % in gate count and power as well as the average enhancement of 43.75 % in security against removal attack was obtained in the proposed approach compared with a recent existing approach. INDEX TERMS Digital signal processing kernel, IP Core, reverse engineering, functional obfuscation.

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