From the course: Learning Cryptography and Network Security
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Exchanging keys using asymmetric encryption
From the course: Learning Cryptography and Network Security
Exchanging keys using asymmetric encryption
- [Instructor] Asymmetric encryption is great for email confidentiality using Pretty Good Privacy or Gnu Privacy Guard. But for large data requirements or data transfer, we use symmetric encryption as it's fast, efficient, with low overhead. Symmetric encryption uses a single shared key to encrypt and decrypt data. That's why most of the time we use a hybrid cryptosystem that uses both asymmetric and symmetric encryption. When using symmetric encryption, such as DES, Triple DES, or AES, to exchange data, both sides must use the same shared key. The question is how do both sides get the same shared key? Scientists realized this early on and developed a way to securely transmit the same shared secret key. We can ensure both parties have the same shared secret key in one of two ways, generate keys using Diffie-Hellman and use asymmetric encryption to transport the shared key. Whitfield Diffie and Martin Hellman were two of a…
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