Dpa countermeasures many electronic devices that use cryptography are susceptible to side channel attacks including spa and dpa a side channel is an unintentional channel providing information about the internal activity of the chip for example power consumption or em emissions. The attacks are practical non invasive and highly effective even against complex and noisy systems where cryptographic computations account for only a small fraction of the overall power consumption. Introduced in 1999 differential power analysis dpa attacks pose a serious threat for cryptographic devices sev eral countermeasures have been proposed during the last years. A power analysis attack can provide even more detailed information by observing the power consumption of a hardware device such as cpu or cryptographic circuit these attacks are roughly categorized into simple power analysis spa and differential power analysis dpa. Fault injection attacks on cryptographic devices and countermeasures part 2 department of electrical and computer engineering differential power analysis 1 collect many ciphertexts and the power traces for the last round 2 guess a byte of the final round key 3 calculate the target byte based on the guess
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