Cryptography
How Are the Three Digits on the Back of Your Credit Card Computed?
The 2-key Triple DES algorithm behind your card's CVV, and the inputs — PAN, expiry date, service code — that go into computing it.
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Cryptography
Why the 3 Digits on the Back of Your Credit or Debit Card Matter
What your card's CVV actually protects against in card-not-present fraud, and why merchants are legally barred from storing it.
Cryptography
The Relationship Between Cryptography and Cryptocurrencies
How digital signatures and public-key cryptography secure cryptocurrency transactions, and what happens if a signing key is lost or stolen.