Discussion

          Symmetric keys are faster because their algorithm takes far less time to execute. Faster working makes it more efficient than asymmetric keys. Due to its efficiency, it is used to process big data efficiently. It is used where speed is required.  The symmetric encryption uses the same key for the encryption and decryption of data. This is why it is a very simple and cheaper technique. It is the disadvantage of using a symmetric key that all the persons involved in this encryption are given the key used for encryption.

          The asymmetric keys are less efficient as they take more time than symmetric keys. Asymmetric keys use two keys: a public key and a private key. The first key encrypts data but the second one decrypts the encrypted information. It is useful where many persons are sharing information. A person gives his information by a public key and the information can be only read by the person who has the private key of that data. So in this way information is secured. The public key can be given to any person to deliver the message. But the private key is given only to the relevant person. It is expensive to use the asymmetric key.

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