Fundamentals of InfoSecintermediate
Explain the steps a recipient follows to recover a file protected with hybrid encryption.
Answer
The recipient uses their private key to decrypt or recover the symmetric key that was protected with their public key. The recipient then uses that symmetric key to decrypt the file.
Explanation
### The concept
Hybrid encryption uses two keys for two related tasks. First, a symmetric key encrypts the file. Then the recipient's public key protects that symmetric key. The recipient reverses those steps: the private key recovers the symmetric key, and the recovered symmetric key decrypts the file. This avoids using the more computationally costly public-key operation for the entire file.
### What a good answer covers
- The recipient applies their private key to recover the protected symmetric key.
- The recipient uses that symmetric key on the file.
- The file was encrypted symmetrically.
- The process combines asymmetric and symmetric methods.
### Remember
Recover the key first; use it to recover the data.
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