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Every single time I try to answer a cryptography question on Information Security it turns out bad. (**This is not a desperate cry for help, I promise.)
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Public key is for encryption, and private key is for decryption in PKIs.
And digital signature employs the PKIs.
How to use a private key for encryption, and using public key for decryption which violate asymmetric cryptography?
from geeksforgeeks
https://www.geeksforgeeks.org/digital-signatures-...
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The Side Channel
Mostly randomly generated noise. – crypto.stackexchange.com