Not necessarily. You can encrypt something twice with different keys. e.g. off the shelf zip archivers dont support 1024 bit keys, but who can stop you from wri

Not necessarily. You can encrypt something twice with different keys. e.g. off the shelf zip archivers dont support 1024 bit keys, but who can stop you from writing a bash script that generates 10 keys using sha1 and a 'seed passphrase' and runs the zip archiver 10 times?