From the course: Blockchain Security by Infosec

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Blockchain security: Public-key cryptography

Blockchain security: Public-key cryptography

From the course: Blockchain Security by Infosec

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Blockchain security: Public-key cryptography

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- [Instructor] Hello, and welcome to this course on Fundamentals of Blockchain Security. In the previous video, we talked about some of the applications of public-key cryptography for the blockchain, identity management, and digital signatures of transactions and blocks. In this video, we're going to be talking about some of the security assumptions of the blockchain's use of public-key cryptography and how those can be violated. And so, if used correctly, public-key cryptography is secure until a large enough or strong enough quantum computer is constructed. And so, since the highest number that a quantum computer so far has factored is something like 21, at the moment, we're a long way away from breaking 2048 bit RSA keys. However, that assumes that public-key cryptography is being used correctly. In reality, public-key cryptography on the blockchain suffers from a few threats, first of which is poor random number generation. And the second is a failure to properly protect private…

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