Reminds me a bit of S/KEY (RFC1760, RFC2289 and others around the 1990's).

Not because of the encryption element, but the part about representing a 64 bit integer as a six word sequence for usability.

(https://en.wikipedia.org/wiki/S/KEY#Usability).

Also used outside of that for quickly/easily recognising hash fingerprints.

(It's easier to recognise that your fingerprint is "GAFF WAIT SKID GIG SKY EYED" than "87FE C776 8B73 CCF9").

(It also slips some parity in there for good measure).