http://giggles.vernccvbvyi5qhfzyqengccj7lkove6bjot2xhh5kajhwvidqafczrad.onion/tutorial/encrypt-pendrive.html
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This will overwrite data on /dev/sdb irrevocably.
Are you sure? (Type 'yes' in capital letters): YES
Enter passphrase for /dev/sdb:
Verify passphrase:
sh-5.1 # file -s /dev/sdb /dev/sdb: LUKS encrypted file, ver 2, header size 16384, ID 3, algo sha256, salt 0xbde461c80b84b0b9..., UUID: 75340512-c028-4a0c-a7be-1dc6e1b3f927, crc 0x20103637c14f8f30..., at 0x1000...