O'clock:通过时钟门控锁定SoC IP保护时钟

M. S. Rahman, Rui Guo, Hadi Mardani Kamali, Fahim Rahman, Farimah Farahmandi, M. Abdel-Moneum, M. Tehranipoor
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引用次数: 11

摘要

现有的逻辑锁定技术可以防止IP盗版或篡改。然而,它们通常以高开销为代价,并且逐渐变得容易受到新出现的去混淆攻击。为了保护SoC ip,我们提出了O' clock,这是一种全自动的基于时钟的方法,可以“锁定时钟”以保护复杂SoC中的ip。O'Clock阻塞数据/控制流,并通过操纵时钟树的活动因子,使底层逻辑因错误的键而失效。O'Clock对原始设计的更改很小,对IC设计流程没有更改。我们的实验结果表明,它对最先进的去混淆攻击(例如,oracle引导的SAT,基于展开/ bmc的SAT,移除和基于oracle的无机器学习的攻击)具有很高的弹性,功耗,性能和面积(PPA)开销可以忽略。
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O'clock: lock the clock via clock-gating for SoC IP protection
Existing logic locking techniques can prevent IP piracy or tampering. However, they often come at the expense of high overhead and are gradually becoming vulnerable to emerging deobfuscation attacks. To protect SoC IPs, we propose O'Clock, a fully-automated clock-gating-based approach that 'locks the clock' to protect IPs in complex SoCs. O'Clock obstructs data/control flows and makes the underlying logic dysfunctional for incorrect keys by manipulating the activity factor of the clock tree. O'Clock has minimal changes to the original design and no change to the IC design flow. Our experimental results show its high resiliency against state-of-the-art de-obfuscation attacks (e.g., oracle-guided SAT, unrolling-/BMC-based SAT, removal, and oracle-less machine learning-based attacks) at negligible power, performance, and area (PPA) overhead.
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