> ie just XOR your plaintext with a random "key" the length of your plaintext This is essentially what a modern cipher does, except that the key is a keystream

> ie just XOR your plaintext with a random "key" the length of your plaintext This is essentially what a modern cipher does, except that the key is a keystream and is generated deterministically from the actual key. This is objectively better than just using a really big key -- it means your shared secret only needs to be e.g. 32 bytes, rather than len(plaintext) bytes! I do still think there's an important use case for high-volume "good" entropy, though: it should replace essentially all uses of "bad" entropy (generated by weak pseudo-random generators, maybe seeded with a few dozen bits of entropy). Programmers should have to go out of their way to get weak entropy, rather than the other way around. Historically programmers have reached for weak RNGs because they tend to be much faster and more convenient to use than the strong RNGs. We should flip that equation. We don't necessarily need a device like this one to do that, but it might help.