Added new cryptography course

mkghosh · mkghosh · commit 81b51d0c9153 · 2016-04-19T22:24:15.000+06:00
diff --git a/extras/courses.md b/extras/courses.md
@@ -131,6 +131,7 @@ Courses | Duration | Effort
 :-- | :--: | :--:
 [Applied Cryptography](https://www.udacity.com/course/applied-cryptography--cs387)| 8 weeks | 6 hours/week
 [Cryptography](https://www.coursera.org/learn/cryptography/)| 7 weeks | 4-7 hours/week
+[Cryptography](https://www.cybrary.it/course/cryptography/)| 3 weeks | 6-8 hours/week
 ### Security
 Courses | Duration | Effort
 :-- | :--: | :--:
