Unable to decrypt file copied from USB thumb drive.
Dirk-Willem van Gulik
dirkx at webweaving.org
Fri Oct 29 12:05:35 CEST 2021
On 29 Oct 2021, at 10:17, Chris Taylor <chris at christaylordeveloper.co.uk> wrote:
> I am developing a backup process for personal files, on USB thumb drive. I tar and zip my files (30GB) then encrypt them with:
> gpg --no-symkey-cache --symmetric --cipher-algo AES256 my-backup.tar.gz
> I copy my-backup.tar.gz.gpg to my USB thumb drive. I am using Ubuntu so the USB drive is formatted to Ext4.
> I try to decrypt with:
> gpg --output my-backup.tar.gz --decrypt my-backup.tar.gz.gpg
> and get the following error:
> gpg: AES256 encrypted data
> gpg: encrypted with 1 passphrase
> gpg: block_filter 0x0000556d112aa1e0: read error (size=13328,a->size=13328)
> gpg: WARNING: encrypted message has been manipulated!
> gpg: block_filter: pending bytes!
> I have gpg version 2.2.19, libgcrypt 1.8.5. Without encryption this process has worked perfectly well many times.
I'd first check with something like
openssl sha256 my-backup.tar.gz
prior to copy / post copy if your thumb drive is good.
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