name: DPA
full_form: Differential Power Analysis
context: according to the one-bit result and compute the mean of all curves in each of the two resulting sets. - Subtract the two means and visualise the resulting curve. - Repeat for all key guesses. - For at most a few key guesses, the resulting curve will show a DPA âpeakâ (whereas all other curves will be completely flat). These key guesses comprise the right key byte. - Iterate on other key bytes and complete the whole secret key by exhaustive search as appropriate. In the case of Rijndael, the secret key may be found byte by byte using a few hundred curves. Thus Rijndael is as vulnerable to DPA as DES. We refer to [8], [10] and [11] for protections and countermeasures against this attack. All input data as well as the secret key may be masked by a random value throughout the cryptographic computations. Special care should be taken when handling the S-box, as this component is non-linear. Following [10], a boolean masked table Sâ can be defined in terms of S, and of the input and output
description: Differential Power Analysis (DPA) is a side-channel attack technique used to extract cryptographic keys by analyzing the power consumption variations of a device during encryption or decryption operations. Attackers can exploit these subtle power fluctuations to infer the key being used.
explanation: DPA is classified as a Security Threat because it directly targets the confidentiality and integrity of cryptographic systems, aiming to compromise sensitive information by exploiting vulnerabilities in hardware implementations.
section_title: 10.8.1.3	Differential Power Analysis
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