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Physical or digital keys. Digital keys are used for encryption or signing, or for authentication (e.g. API key). For product keys, use the tag product-key.

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how do i find the number of possible keys / password to decrypt a plain text

In does not matter how many rounds of caesar cipher you use, effectively it still becomes one single round with key (k1+k2+k3 ....kn) mod a, where a is the number of alphabets, 26 in English alphabet. …
Manish Adhikari's user avatar