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A comment on A plastic card for easy to remember strong passwords. Parent comment

Re:A plastic card for easy to remember strong passwords by spinlock on Saturday January 10, 2015 @09:02PM (#8868750)
Aren't the cards all different? I assumed it would be a one-time-pad which is much more secure than a simple substitution.
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Re:A plastic card for easy to remember strong passwords by aquark on Saturday January 10, 2015 @09:29PM (#8868797)
Yes, they are different. But that just makes it a substitution cipher with unique keys.

A one time pad requires a key as long as all the messages you want to encode since each key bit is only used once.

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