Program Security

I am not much on the tech details of the hardware but my hobby for the
past 25 years has been the breaking of software security codes only
for personal satisfaction, not for profit.
Haven't failed yet.
I do get a few tips from my SIL as he is a security expert with IBM
and under contract to Uncle Sam. He has told me that no matter how
dedicated the person who writes the security code may be, there is
another who is smart enough to decipher it.
The funniest instance that I had was back when I was still active in
business and a pompus jerk came into my office and handed me a disk
and said "I'd like to see you break this". He sat down and while we
were talking I returned his disk to him and ran the program on my
computer. All of about 5 minutes. He was rather taken aback.