That is a much better patent. Sorry for the confusion. The "index into a random data block" is already a primitive cryptographic operation in key expansion and

That is a much better patent. Sorry for the confusion. The "index into a random data block" is already a primitive cryptographic operation in key expansion and hashing algorithms, but the block is deterministically generated pseudo randomly from a seed. It would be interesting to replace the seeding operation with an offset into a large static pool generated from a source of true randomness.