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• W3198004693 abstract "With proliferation of DNN-based applications, the confidentiality of DNN model is an important commercial goal. Spatial accelerators, that parallelize matrix/vector operations, are utilized for enhancing energy efficiency of DNN computation. Recently, model extraction attacks on simple accelerators, either with a single processing element or running a binarized network, were demonstrated using the methodology derived from differential power analysis (DPA) attack on cryptographic devices. This paper investigates the vulnerability of realistic spatial accelerators using general, 8-bit, number representation. We investigate two systolic array architectures with weight-stationary dataflow: (1) a 3 $times$ 1 array for a dot-product operation, and (2) a 3 $times$ 3 array for matrix-vector multiplication. Both are implemented on the SAKURA-G FPGA board. We show that both architectures are ultimately vulnerable. A conventional DPA succeeds fully on the 1D array, requiring 20K power measurements. However, the 2D array exhibits higher security even with 460K traces. We show that this is because the 2D array intrinsically entails multiple MACs simultaneously dependent on the same input. However, we find that a novel template-based DPA with multiple profiling phases is able to fully break the 2D array with only 40K traces. Corresponding countermeasures need to be investigated for spatial DNN accelerators." @default.
• W3198004693 created "2021-09-13" @default.
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• W3198004693 date "2021-08-28" @default.
• W3198004693 modified "2023-09-26" @default.
• W3198004693 title "Power-Based Attacks on Spatial DNN Accelerators" @default.
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• W3198004693 doi "https://doi.org/10.48550/arxiv.2108.12579" @default.
• W3198004693 hasPublicationYear "2021" @default.
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