Update free-courses-en.md (#12270)

Remove broken link: https://open.ruhr-uni-bochum.de/en/lernangebot/introduction-cryptography
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Benjamin Yee
2025-10-06 19:14:12 -07:00
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* [Cryptography & Network Security](https://www.youtube.com/playlist?list=PLBlnK6fEyqRgJU3EsOYDTW7m6SUmW6kII) - Neso Academy
* [Cryptography Lecture Series](https://www.youtube.com/playlist?list=PL2jrku-ebl3H50FiEPr4erSJiJHURM9BX) - Christof Paar
* [Foundations of Cryptography](https://www.youtube.com/playlist?list=PLgMDNELGJ1CbdGLyn7OrVAP-IKg-0q2U2) - NPTEL Indian Institute of Science, Bengaluru
* [Introduction to Cryptography](https://open.ruhr-uni-bochum.de/en/lernangebot/introduction-cryptography) (Christof Paar)
* [Stanford Cryptography I](https://www.coursera.org/course/crypto) - Dan Boneh