Computer Science for IGCSE & O level - The Internet And Its Uses (Section 3 - No. 15)
What is the purpose of a 'public key' in cryptography?
To verify the identity of a user.
To encrypt data that can only be decrypted by a private key.
To digitally sign documents.
All of the above.
Explanation
A public key can be used to encrypt data, and verify a digital signature.
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