Tell us what you are trying to do?
Is there any documentation that you are following?
Is there a similar example that we can see?
What is the link to your site?
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Sorry, I don't see how you would do that.
Perhaps there is a solution available for WordPress that filters the API functions to add or update post meta and get post meta, to encrypt and decrypt as required.
When Toolset saves custom field values to the database and when it retrieves them it is just using the standard WordPress APIs.
It would be nice for Toolset to have encryption field option as with ACF (below).
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Yes, but that is an add-on created by someone, it's not part of ACF.
It should be possible to do something similar with Toolset custom fields, but you would need a developer to develop it.
If it's an important feature for you then you could try posting a job with Toolset contractors at https://toolset.com/contractors/
