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The signed message was post:{hash}:{timestamp}, so a captured request replayed with any payload. It becomes post2:{hash}:{timestamp}:{sha256}:{length}.
prepare_post_backup now takes the ciphertext rather than its hex, so the signed digest cannot disagree with what the request carries. post_message is public because backup-server repeats the same string, and both sides pin it in a test.
The request carries the new signature alone. The server takes exactly one, so it ships before this.
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The signed message was post:{hash}:{timestamp}, so a captured request replayed with any payload. It becomes post2:{hash}:{timestamp}:{sha256}:{length}.
prepare_post_backup now takes the ciphertext rather than its hex, so the signed digest cannot disagree with what the request carries. post_message is public because backup-server repeats the same string, and both sides pin it in a test.
Undraft once https://github.com/Foundation-Devices/backup-server/pull/8 is merged and deployed