Understanding Cryptography by Christof Paar and Jan Pelzl - Chapter 1 Solutions - Ex1.6

- 1 min

Exercise 1.6

Compute without a calculator:

  1. 1/5 mod 13
  2. 1/5 mod 7
  3. 3 · 2/5 mod 7


I haven’t yet verified this solution independently. If you spot any mistakes, please leave a comment in the Disqus box at the bottom of the page.

In order to perform a division by , we must find the multiplicative inverse and multiply by it.




Thomas Busby

Thomas Busby

I write about computing stuff

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