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I bet the jammers were unsophisticated enough you could just program the GPS to continue moving in the direction where the over the air noise levels kept increasing.
Depending on the range at which the signals start to become jammed, it could be possible to navigate solely by IMU for the final leg also.
I'm not sure I follow you. If the missile is using gps for guidance(during at least part of it's flight), then it is by definition a gps quided rocket is it not?
Also, gps quidance isnt terribly expensive. I use industrial grade units which go for about 3kusd and provide sub-metre accuracy in highly gnss denied enviroments. Lower grade ~3m accuracy units go for around a hundred dollars, and would be completely sufficient for hitting a target the size of a truck.
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For all the legitimate criticisms of Russian military, their EW and Counter-EW capabilities are actually world class. Which is why it is a big deal when they're destroyed, or captured.
The bombs were probably using the encrypted military GPS frequencies that are more resistant to jamming.
Encryption isn't really a factor with this type of satellite navigation jamming, at least as far as I'm aware.
Frequency hopping however can be a used as a RF jamming countermeasure, but I'm not sure if that is really for satellite navigation systems.
The frequencies all satnav systems work on are also very specific and known. I would assume that any satnav jammers just jam all RF used by all GNSS constellations at once, but maybe they open up certain bands to allow for their own guided munitions at pre-scheduled times.
As another commenter said, I don't think cryptography is the main problem.
You've got to be able to modulate some numbers out of the radio signal first before you need to be concerned if it's encrypted or not.
GPS signals from power conserving satellites are so weak that I'd imagine that overwhelming them with noise on all frequencies would be the easy answer. (Although there's a Big Brain hyper-cunning answer to that...).
Some GPS jammers are known to transmit, instead of noise, a bad signal which creates an offset in the timing to calculate a false position. But with encrypted military GPS, that's not as effective.
I don't think PGMs with M-Code GPS capabilities are being provided to Ukraine, but that is definitely something well outside of my casual knowledge base, so I'm open to being corrected.