I can't find anything about encryption on Apple's sites, but are password-protected notes using E2E encryption?
Are password-protected notes encrypted
encryptionnotes.apppasswordSecurity
Related Solutions
The last Time I checked a 128 bit RC4 encryption of the whole document was used. Also, compatability should be vested.
Here's a screenshot of the output of GuaPDF:
simply format the second partion as Mac OS journaled encrypted via Disk Utility
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Best Answer
Secure Notes are encrypted with Triple DES, and are kept in the device keychain.