AFAIK there's no "encryption for humans" library (at least no widely known, widely used, widely tested one) - they all rely on the developer to specify the righ

AFAIK there's no "encryption for humans" library (at least no widely known, widely used, widely tested one) - they all rely on the developer to specify the right parameters into the function, with no sanity checking asserts. The results of this is things like the developer who used "1" as the multiplication factor, so to decrypt the data, you need to divide each block by 1...