On top of my mind comes caesar cipher, but that is not really secure
so what is the most secure encryption algorithm that doesn't affect entropy or even lowers it?
I know this might not be as secure as normal encryptions, but I'm asking about what is the most secure among these types of encryptions?
basically I have a series of bytes, and I want to encrypt them in a way that a machine that only checks the entropy to detect encryption gets bypassed. so basically this encryption doesn't affect the entropy, or even better if possible, lowers it.
I thought maybe I can just replace each byte with another, but was wondering is there any better method? keep in mind that security is my second priority and keeping or lowering entropy is my number one priority