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Is a different encryption and decryption algorithm used for every secret key, or can I use the same encryption and decryption algorithm for different keys?

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  • $\begingroup$ The point of separating the key from the algorithm is precisely so that everybody can safely use the same algorithms with their own keys. $\endgroup$ – Luis Casillas Jan 24 '17 at 22:03
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You can use the same ones (which is good, because otherwise you'd run out of them pretty fast). In fact, when a cipher allows you to choose a key, that's basically the same as giving you a new pair of encryption/decryption algorithms for every key.

Usually, when designing a system that uses symmetric encryption, a small set of ciphers are used. For example, the popular NaCl library only uses Salsa20+Poly1305 and AES-GCM.

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It depends from the algorithm that you will use. For example DES algorithm has a little different way for Encrypt/Decrypt for every key but Vigerene does not.

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