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Computer Science for IGCSE & O level - Data Transmission (Section 12 - No. 17)

In symmetric encryption, what is used for both encryption and decryption?
Two different keys
A public key and a private key
A single, shared secret key
The sender's public key and the receiver's public key

स्पष्टीकरण

Symmetric encryption uses the same key for both encryption and decryption.

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