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Asked: 2026-06-12T23:19:17+00:00

I want to encrypt some Core Data columns with the NSValueTransformer class but I’m

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I want to encrypt some Core Data columns with the NSValueTransformer class but I’m not quite sure what encryption method to use. Has anyone ever tried to encrypt individual entities while using Core Data and if so, is there any sample code of a working implementation? I would want the encryption to not interfere with any NSPredicates I use later on to get back data from the db

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  1. Editorial Team

    The iPhoneCoreDataRecipes sample code from Apple has an example of using a subclass of NSValueTransformer along with a transformable attribute in the model. See the transformable attribute type setting:

    enter image description here

    and the value transformer implementation:

    In your case, you would need to provide the encryption and decryption algorithms in the transformedValue and reverseTransformedValue methods respectively, along the lines suggest here.

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