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Posted on July 22, 2013

Credit Card Numbers
How do credit card numbers work? Parity and RAID.

Posted on February 11, 2020

Who finished second?
A fun little puzzle created by the NSA in 2016.

Posted on December 21, 2010

Spot the connection
What do all these famous scientists and engineers have in common?

Posted on November 01, 2013

De Bruijn Sequences
What does DNA sequencing and guessing passwords have in common?