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Is there a technical difference between decryption and deciphering?

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There's no actual technical difference, but it's sometimes used in different contexts.

Decryption: Used when talking about reversing an encryption of any type and when you know for sure that a message has been encrypted.

Deciphering: Used when (mostly) turning a ciphertext back to the plaintext, i.e. when a sentence has been encrypted with some sort of cipher like for example Caesar or Vigenère. It's also appropriate to use this term if people assume that a message has been encrypted or obfuscated.

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