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Updated Backups (markdown)

Dominik Schürmann 2015-10-16 00:49:37 +02:00
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Backups.md

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In OpenKeychain, backups are encrypted using:
* AES-256 (because this is default for all encrypted files in OpenKeychain)
* Passphrase is based on 24 uppercase characters, separated with dashes into 4*6 character chunks. Thus, the passphrase is 27 characters long, example: ``ABCDEF-GHIJKL-MNOPQR-STUVWX``.
* Possible combinations are: 26**24 = 2**112.8
* Possible combinations are: 26^24 = 2^112.8
* The backup file is ASCII Armored and a special header is added: ``BackupVersion: 1``
* OpenKeychain detects the header and shows an improved UI for input of the Backup Code
* The header does not automate anything, it poses no security threat.