In hybrid encryption, the temporary symmetric key generated to encrypt data for a single communication exchange and discarded afterward is known as a ______ key.
Answer
session
Explanation
### Why this is right
The session key is the temporary symmetric key used to encrypt the message. In the described hybrid process, the recipient’s private key recovers that key from its public-key-encrypted form.
### The concept
After recovering the session key, the recipient uses it to decrypt the message. This arrangement uses asymmetric cryptography for key protection and symmetric encryption for the message. The lesson says the session key is discarded after the session rather than reused.
### Terms
- **Session key**: A temporary symmetric key used for one communications session.
- **Hybrid encryption**: A design combining asymmetric and symmetric cryptographic methods.
- **Private key**: The secret half of a public/private key pair.
### Remember
In hybrid encryption, the private key recovers the session key, not the message directly.
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