From the course: Learning Cryptography and Network Security
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Grasping public key cryptography
From the course: Learning Cryptography and Network Security
Grasping public key cryptography
- [Instructor] Symmetric encryption provides fast, efficient encryption. However it requires both the sender and receiver have the same shared key which can be a problem in a complex networked environment. Asymmetric encryption is also called public key encryption and it uses two keys that are mathematically related. A public key that you publish and share and a private key that you keep private. Scientists developed asymmetric encryption in the 1970s as a need for securely exchanging a secret key became evident. Let's step through the process of encrypting data that only Bob should see using asymmetric encryption. We start with Alice sending a secret message to Bob with plaintext input. And now we take Bob's public key and the encrypting algorithm, it then becomes cipher text. It's sent to Bob who uses Bob's private key and the decryption algorithm. It then becomes plaintext output. And because only Bob has Bob's private…
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