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What are the security differences between storing a seed phrase in the following ways:

- Locked note in iCloud
- Password-protected in Keychain like how Rainbow does it
- largeBlob with a passkey in iOS17+

I think I understand the UX implications of each, but curious about the technical side

Venture Partner at marinventures.com | Security Consultant at horizonslaw.io | Cybersecurity M.S. Candidate at gatech.edu

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Thanks for the tag @samantha! So going in order:
- Locked notes: copying and pasting isn't great and not designed for key management
- Keychain: see below
- Passkey: Designed specifically for keys and uses iCloud keychain escrow so pretty much builds on top of keychain.
@dwr.eth gets into it in his recent posts.

I think another method could be storing the seed phrase on the iPhone secure element, but I've honestly not really looked too much into iOS programming. Not sure how possible that is.