Is it possible to decrypt a message without the key?

Question

I have an encrypted message using a key which we are not aware of and here we need to decrypt that same message to its original form. Can that be possible without knowing the shared key. If so please let me know the solution

Answer 1

Short answer is no,

You have an encrypted message, do de-crypt it in the normal method you need the key and the algorithm using which it was encrypted. If anyone is missing it almost impossible to decrypt assuming it was encrypted using one of the standard method (not using a simple one).