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Editorial Team
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Asked: 2026-05-28T07:09:27+00:00

I need to know the crypto algorithm and key strength of NSDataWritingFileProtection . I

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I need to know the crypto algorithm and key strength of NSDataWritingFileProtection. I would like to know the same things for using the Keychain and NSFileManager.

I searched the Apple Developer references:

But found noting specific.

The Advanced Encryption Standard Algorithm Validation List
contains multiple entries of Apple using AES 128bit-256bit but nothing in connection to keychain or NSDataWritingOptions or NSFileManager

Thanks for your help, a better link to the documentation would fit my needs.

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1 Answer

  1. Editorial Team

    Used that source iPhone in Business – Security Overview

    AES-256bit in iPhone hardware encryption (page 3 Chapter Encryption)

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