Check Digits & Hashing Ideas: ISBN-13 and Luhn
This lesson is part of the course
In this lesson
You compute the check digit of an ISBN-13 with alternating weights and the Luhn check digit of a ticket number, the same MOD 10 idea used on payment cards.
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Lessons in this course
- MOD & Clock Arithmetic: Remainders That Wrap Around Locked
- Caesar & Affine Ciphers: Letters as Numbers Locked
- Frequency Analysis: Breaking a Caesar Cipher with COUNTIF Locked
- GCD & Euclid's Algorithm: A Step Table Locked
- Modular Inverse with the Extended Euclidean Algorithm Locked
- Fast Modular Exponentiation: Square-and-Multiply Locked
- Toy RSA: Keys, Encryption & Decryption Locked
- Check Digits & Hashing Ideas: ISBN-13 and Luhn Locked