Logic Locking in Single Flux Quantum Circuits
Logic Locking in Single Flux Quantum Circuits
复制标题
单通量量子电路中的逻辑锁定
DOI：
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复制
发表时间：
2021
影响因子：
1.8
通讯作者：
E. Friedman
中科院分区：
文献类型：
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作者：
T. Jabbari;G. Krylov;E. Friedman
RSFQ电路的硬件安全性已经成为未来亿亿次计算系统中日益重要的问题。RSFQ电路中的硬件安全性与使用敏感信息操作的大规模数据中心特别相关。基于铱的技术的制造设施的数量是有限的，并且用于分配制造电路的供应链可能受到损害。在现代CMOS电路中广泛使用逻辑锁定，以通过使用秘密密钥掩蔽电路的功能来增强安全性。如果攻击者拥有由逻辑锁定保护的物理电路，则攻击者将无法确定预期的功能。本文提出了一种新的SFQ电路逻辑锁定方法。互感用于将附加电流施加到部分或全部逻辑门。这些电流充当访问SFQ逻辑元件功能的关键。在所提出的技术中，只有在将额外的正确电流施加到所有锁定的门之后，电路才会产生正确的输出。通过使用具有连接到栅极内部电感的正负互感的电感器，解锁安全电路所需的电流范围大大缩小。在这项工作中，这个建议的逻辑锁定技术的操作演示使用修改SFQ或门，使安全性，同时保持适当的功能。实现了不到4%的面积开销。
The hardware security of RSFQ circuits has become an issue of growing importance for prospective exascale computing systems. Hardware security in RSFQ circuits is particularly relevant to large scale data centers operating with sensitive information. The number of fabrication facilities for superconductive niobium-based technology is limited, and the supply chain for distributing fabricated circuits can be compromised. Logic locking is widely used in modern CMOS circuits to enhance security by masking the functionality of the circuit using a secret key. If an attacker possesses a physical circuit secured by logic locking, the attacker would be unable to determine the intended function. In this paper, a novel methodology for logic locking is proposed for SFQ circuits. Mutual inductances are used to apply additional currents to some or all of the logic gates. These currents behave as keys to access the functionality of the SFQ logic elements. In the proposed technique, only after an additional correct current is applied to all of the locked gates will the circuit produce the proper output. By using inductors with a positive and negative mutual inductance connected to the internal inductances of the gates, the range of current required to unlock a secured circuit is greatly narrowed. In this work, the operation of this proposed logic locking technique is demonstrated using modified SFQ OR gates to enable security while maintaining proper functionality. Less than 4% area overhead is achieved.