Which of these is not a type of session key?

Symmetric key distribution is the process of using the same key to encrypt and decrypt data. In symmetric key cryptography, both parties must exchange a secret key.  Here are some ways to distribute symmetric keys: Third party: A third party can select the key and physically deliver it to the parties. Previously used key: If the parties have recently used a key, one party can transmit the new key to the other, encrypted using the old key. Symmetric key exchange: In this method, one entity creates the symmetric key and encrypts it using a public key provided by the other entity. The first... Show more

Symmetric key distribution is the process of using the same key to encrypt and decrypt data. In symmetric key cryptography, both parties must exchange a secret key. 

Here are some ways to distribute symmetric keys:
Third party: A third party can select the key and physically deliver it to the parties.
Previously used key: If the parties have recently used a key, one party can transmit the new key to the other, encrypted using the old key.
Symmetric key exchange: In this method, one entity creates the symmetric key and encrypts it using a public key provided by the other entity. The first entity then sends the encoded symmetric key to the second entity, which decrypts it with the private key. 

Key distribution has been problematic in the past because it involved:
Face-to-face meetings
Using a trusted courier
Sending the key through an existing encryption channel 

Some key distribution technologies include:
Distributed Symmetric Key Exchange (DSKE): This technology automates the creation and distribution of symmetric keys. DSKE is designed to protect data across network communications.
Quantum Key Distribution (QKD): This technology uses quantum physics to secure the distribution of symmetric encryption keys. QKD works by sending photons, or quantum particles of light, across optical links. 

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