The answer to that question Angie is yes. Actually a lot have been cracked. The only safe code is a single use code. Use it once and toss it. There are now computer encryption codes that use that same methodology. However not in any commercial application yet. Many are quite strong and getting better all the time as computer capability grows. Of course as computers get better, they also get better at breaking them.
If you had two disks, and only two, each with a million different identical encryption deep codes on them and you had one and I had one. Then we each have a set of access codes to those million codes. Then you use a separate and unique communication method to say "I sent you document XX which was created and decoded using code ABCDE, then once used you delete that code and never use it again, it is impossible to break. Everything else can be broken.
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