Power analysis
（重定向自Differential Power Analysis）
![A diagram of differential power analysis.](/Images/godic/202501/09/Differential_power_analysis.svg4051.png")
![An attempt to decode RSA key bits using power analysis. The left peak represents the CPU power variations during the step of the algorithm without multiplication, the right (broader) peak - step with multiplication, allowing to read bits 0, 1.](/Images/godic/202501/09/Power_attack_full4051.png")
In cryptography, power analysis is a form of side channel attack in which the attacker studies the power consumption of a cryptographic hardware device (such as a smart card, tamper-resistant "black box", or integrated circuit). The attack can non-invasively extract cryptographic keys and other secret information from the device.