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so important when we talk welcome to this lecture about public key cryptography and you will see why this knowledge is so important when were talking about blockchain very soon because you might have heard that you send transactions in Bitcoin and that these transactions needs to be signed by your private key but you never really understand what the private key is and you dont really really know what a public key is well in this lecture youre going to know all about that so let me end it first of all we have to understand that public key cryptography has several use cases and so one of the use case is here in blue it is encryption namely how we can send data between different parties on an unsecured Network so for example you are in one city Im in another city and I want to send a message to you through the internet but the Internet is a public network I dont really trust the internet when it comes to sending secret messages so how can I send a message to you so encryption is one
