On 27 Dec 2019 10:56 -0500, from gebser@xxxxxxxxxxxx (ken): > Compressing a file is one step in the encryption of that file. So if > your LUKS2 header file is encrypted, it's also already compressed. > Using ZIP on it would yield no further compression. No, encryption does not imply compression. Rather, trying to compress ciphertext is a largely pointless exercise if the encryption is any good in the first place; therefore, _if_ you're going to compress the data you're encrypting (keeping in mind that doing so is not always a good idea; see compression oracle attacks), then you need to compress first, then encrypt, not the other way around. I'm pretty sure the LUKS header backup isn't compressed. -- Michael Kjörling • https://michael.kjorling.se • michael@xxxxxxxxxxx “Remember when, on the Internet, nobody cared that you were a dog?” _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx https://www.saout.de/mailman/listinfo/dm-crypt
