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One way to solve this problem is to have the client have a set of one or more certificates it trusts.
If the certificate is not in the set, the server is not to be trusted.
As of 2012, a 2048-bit RSA signature with an exponent of 65537 expiring yearly is acceptable.
When rotating keys, you should check for recommendations from an authority (such as NIST) about what is acceptable.
The third case of occurs due to a missing intermediate CA.
When issuing a certificate for a server, the CA signs the server certificate using its private key.
This is similar to an unknown certificate authority, so you can use the same approach from the previous section.
You can create your own , this time trusting the server certificate directly.
This has all of the downsides discussed earlier of tying your app directly to a certificate, but can be done securely.
However, you should be careful to make sure your self-signed certificate has a reasonably strong key.
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Unfortunately, now the client app has to be updated due to what is essentially a server configuration change.