mod 24 isn't a field, so it's not easy to add good error protection to base24 using a regular cyclic code. You can add a single check digit with good performan

mod 24 isn't a field, so it's not easy to add good error protection to base24 using a regular cyclic code. You can add a single check digit with good performance using the Damm algorithm: https://en.wikipedia.org/wiki/Damm_algorithm https://en.wikipedia.org/wiki/Damm_algorithm one of the external links on that article has a suitable quasigroup matrix for Z_24.