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Bob wants to ensure that Alice can check whether his message has been tampered with.

Bob wants to ensure that Alice can check whether his message has been tampered with. He creates a checksum of the message and encrypts it using asymmetric cryptography. What key does Bob use to encrypt the checksum for accomplishing this goal?

A.

Alice's private key

B.

Alice's public key

C.

His own private key

D.

His own public key

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