https://crypto.stanford.edu/~dabo/courses/OnlineCrypto/?fbclid=IwAR2KdlqK13cW-XdvbYz5SyAeyxkBYrPuCEXF-AxaAWp_Qixye6RHlNF1Uog

https://www.youtube.com/playlist?list=PL58C6Q25sEEHXvACYxiav_lC2DqSlC7Og

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Dears, 

Useful Videos Modern cryptography

https://www.khanacademy.org/computing/computer-science/cryptography/modern-crypt/v/the-fundamental-theorem-of-arithmetic-1