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I tried to research this, but i haven't found many resources to learn from. I'm turning to this community, because some of you guys know a lot about security by nature.
My Linux system is encrypted using LUKS except for the boot partition. I want to have a more secure password. I have hard disks and SSDs in my system. I was wondering if someone with physical access was theoretically able to unlock the filesystems with the old password after i changed it. (Maybe by cracking the old one first.)
Should i erase and overwrite the disks before creating a new filesystem to copy my data? I want to avoid that, because its a really big hassle with many terabytes of data.