There are a number of key management challengesthat exist for the implementation of symmetric encryption.
One of the primary concerns in key management is the safe dissemination of the keys between the sender and the recipient. It is paramount that at no point in the transmission of the key that it is intercepted.
To mitigate this, one method to ensure the safe transmission of the secret shared key is through the usage of digital certificates which can transmit the key as well as attest to the identity and veracity of the sender.
Another concern for key management is managing and overseeing the many keys that may be in use between a large number of senders and recipients. A related concern is a proper and effective method of destruction of the symmetric key when it is desired to remove the key from service.