(12-04-2019, 05:49 AM)z3bra Wrote: Thus block chain stuff you describe seems complicated. Can it be implemented easily and without too much effort?

You can rely on the crypto library you are using to do the heavy lifting. It's probably just some parameter that you give to AES.
My idea is that you should probably chain the values so that chunks in memory can't be decrypted by themselves alone. However, that's going to be more expensive as you'll need to pass through the blocks to get to the required value.
https://en.wikipedia.org/wiki/CBC-MAC