Fundamentals of InfoSecintermediate
Compare symmetric and asymmetric encryption by key use and key distribution.
Answer
Symmetric encryption uses the same secret key for encryption and decryption, so parties must share it securely. Asymmetric encryption uses a public and private key pair: the public key may be distributed, while the private key is kept by its owner.
Explanation
### The concept
Symmetric encryption centers on one shared secret. It is efficient, but every intended party needs access to that secret, which creates a distribution problem. Asymmetric encryption separates the key roles: a public key may be shared, and the owner retains the private key. In the confidentiality workflow, senders use the recipient's public key and the recipient decrypts with the private key.
### What a good answer covers
- Symmetric encryption uses one shared key.
- The symmetric key must be shared securely.
- Asymmetric encryption uses a public and private key pair.
- The public key is distributable; the private key is protected.
### Remember
The key-distribution difference is the central contrast between the two methods.
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