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Symmetric and Asymmetric Encryption
The basic difference between these two types of encryption is that symmetric encryption uses one key for both encryption and decryption, and the asymmetric encryption uses public key for encryption and a private key for decryption.
In a symmetric-key algorithm the key used to encrypt is the same as the one used to decrypt. For this reason, it needs to be kept secret. (Above)
PowerPoint Lesson
Additional Reading
https://en.wikipedia.org/wiki/Public-key_cryptography
http://encryptionanddecryption.com/algorithms/asymmetric_algorithms.html
Suggested Video
Video Link #2: https://youtu.be/O4xNJsjtN6E