Difference between Symmetric and Asymmetric key cryptography

Symmetric key Cryptography	Asymmetric Key Cryptography
Symmetric key cryptography uses the same secret (private) key to encrypt and decrypt its data	Asymmetric key cryptography uses a public and a private key to encrypt and decrypt its data
The secret key must be known by both parties.	The public key is known to anyone with which they can encrypt the data but it can only be decoded by the person having the private key
In key distribution process, key information may have to be shared which decreases the security.	Here, the need for sharing key with key distribution center is eliminated.
Symmetric key encryption is faster than asymmetric key.	It is Slower than symmetric key encryption.
Basic operations used in encryption/ decryption are transposition and substitution.	It uses mathematical functions.