[nayuki]

The way that the author uses pure Excel formulas (no VBA or macros) to compute a QR Code from scratch is similar to how I used pure Excel to compute ciphers:

* AES cipher internals in Excel: https://www.nayuki.io/page/aes-cipher-internals-in-excel

* DES cipher internals in Excel: https://www.nayuki.io/page/des-cipher-internals-in-excel

[vegetablepotpie]

That's really cool. I've been wanting to delve into the inner workings of ciphers for some time and I think this will make it easier.

[nayuki]

Thanks! I have another piece of work that shows the internal computations. I implemented hashes and cipher in short Python code. You can insert debugging prints easily to show the intermediate values. https://www.nayuki.io/page/cryptographic-primitives-in-plain...