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attacks using information leaked by implementations of cryptographic algorithms to obtain information about keys or (plaintext) data, instead of (or additional to) using cryptographic weaknesses.

Examples include measuring timing, power consumption, electromagnetic radiation or sound, while an implementation performs the algorithm.

Social engineering (e.g. convincing people with legitimate knowledge of the secrets to share them) is not considered a side channel attack (and off topic on crypto.stackexchange.com).

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