eFUSE Zeroization

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

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2.4 English

Although the eFUSE key can by "oneized" by blowing all the eFUSEs from inside the device, it is unclear how much value this provides from a security point of view. Care must be taken to ensure that the key cannot be observed using a simple power analysis (SPA) attack during the blowing of the key bits. It is also possible for an adversary to manipulate external voltages and clocks to compromise successful eFUSE programming.