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Encyclopedia > Differential Power Analysis

Differential power analysis (DPA) is a method of attacking a cryptosystem which exploits the varying power consumption of microprocessors while executing cryptographic program code. It is a side-channel attack. Using statistical analysis of the power consumption measurements of many runs of a given crypto graphic algorithm, it may be possible to infer information on a secret key stored on a smart card, if the implementation of the algorithm is not DPA tamper proof. A cryptosystem (or cryptographic system) is the package of all procedures, protocols, cryptographic algorithms and instructions used for encoding and decoding messages using cryptography. ...


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Power analysis - Wikipedia, the free encyclopedia (560 words)
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, tamperproof "fl box", microchip, etc).
Differential power analysis is an extension of power analysis that can allow an attacker to compute the intermediate values of data blocks and key blocks.
Power analysis can most easily distinguish conditional branches in the execution of the cryptographic program since a device does different things (requiring different power) depending on which conditional branch is executed.
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