1 related insight
Use this topic page to move quickly through the most relevant Attomus thinking without losing the wider context across the full insights section.
Insights Topic
Aes Gcm
Browse Attomus insight related to aes gcm, 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.
Read article