tf on Nostr: For the nsec[...] nak key generate | nak encode nsec For the npub[...] nak key public ...

For the nsec[...]
nak key generate | nak encode nsec

For the npub[...]
nak key public [paste nsec] | nak encode npub

The nsec and npub can be converted back to hex with

nak decode npub [key]
nak decode nsec [key]