Not necessarily. Crypto involves mostly computer technology now-a-days: PKI, Asymmetric keys, Symmetric keys, certificates, etc.
Source: Me. Former COMSEC officer.
There are still daily changing codes.
But they are loaded a month at a time. OR they were when I was deep, deep into classified comms for the MEECN network.
The last time I saw any of it, it was a paper tape with a 30 day key.
And of course there was the hardware.