agenix/doc/rekeying.md

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# Rekeying {#rekeying}
If you change the public keys in `secrets.nix`, you should rekey your
secrets:
```ShellSession
$ agenix --rekey
```
To rekey a secret, you have to be able to decrypt it. Because of
randomness in `age`'s encryption algorithms, the files always change
when rekeyed, even if the identities do not. (This eventually could be
improved upon by reading the identities from the age file.)