u/Puzzleheaded_Two415

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This is because this is not the normal definition of !, the factorial, and is instead x!=2.

DBs}xJLgqELoGrHzskm5HSHuSJJwFlwpCxUtWrUuYIu[Y3l8NsjIP7ftbQbxv0UCytGYSxRKKW8n3iEo877cXsSAuG

I myself cannot see the difference between ciphertext and absolute gibberish, so I'll give hints:

1. There are fake letters added to the ciphertext.
2. The key is "strong________", you must figure out the rest
3. This is very much a theoretically breakable cipher.