> anyone [...] can see an obvious weakness here: the procedural algorithm will produce a pattern that can be found and used to break the key. [...] But what if

> anyone [...] can see an obvious weakness here: the procedural algorithm will produce a pattern that can be found and used to break the key. [...] But what if the algorithm isn’t specific? What if the key describes the algorithm? If the key is data that can be used as an algorithm to produce data, we can create a cycle where the algorithm is self modifying and therefor wont create a pattern. This doesn't seem right. If "the key describes the algorithm" you need another algorithm to generate the algorithm from the key. This other algorithm is unique and will produce patterns like any other deterministic algorithm. Patterns in the generated algorithms will eventually be reflected in the data.