This is something which I should really know, and every time I hear it and look it up I do know it, I just couldn't recite it if someone asked. So here's a description to read a few times and hopefully cement it there a little more!
Symmetric Key Algorithms use the same keys for both the encryption of plain text and the decryption of cipher text. I.E. the same key is used to be encrypt and decrypt. In practice it is a shared secret password, which both parties know.
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