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What Is a Digital Signature? How Could a Digital Signature

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What is a digital signature? How could a digital signature ensure data integrity when conducting e-business?
B.
6) Receiver B receives the package and decrypts it using Receiver B's private key. Receiver B now has the document and Sender A's digital signature.
7) Receiver B decrypts Sender A's digital signature using Sender A's public key to get the sent-over MD. Receiver B also authenticates that Sender A is the document creator.
8) Receiver B makes a copy of the received document and uses SHA-256 to hash the copy and get a calculated MD.
9) If the sent-over MD is the same as the calculated MD, Receiver B ensures data integrity.

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Digital signature is a message digest (M...

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