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Backup
Browse Attomus insight related to backup, with a focus on programme delivery, operational judgement, and professional execution in demanding environments.
Why We Chose a 28-Byte Backup Header
The backup format for an authenticator app looks like a solved problem. Encrypt the secrets with a passphrase, write the ciphertext to a file, done. It is not done. The naive version fails silently in several distinct ways, and the worst of them leaves a user holding a file that will never decrypt again, reporting an error that blames their passphrase for something else entirely. The 28-byte header we settled on came out of working through those failures one at a time. The same reasoning applies to any format that combines key derivation with authenticated encryption.
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