More free lessons at: www.khanacademy.org/video?v=Aq3a-_O2NcI A high-level explanation of digital signature schemes, which are a fundamental building block in many cryptographic protocols. Video by Zulfikar Ramzan. Zulfikar Ramzan is a world-leading expert in computer security and cryptography and is currently the Chief Scientist at Sourcefire. He received his Ph.D. in computer science from MIT.

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