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A sequence of bits appended to a digital document that is
used to secure an e-mail sent through the Internet is called a:
A. digest signature.
B. electronic signature.
C. digital signature.
D. hash signature.
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Answer: C
A digital signature through the private cryptographic key
authenticates a transmission from a sender through the
private cryptographic key. It is a string of bits that
uniquely represent another string of bits, a digital
document. An electronic signature refers to the string of
bits that digitally represents a handwritten signature
captured by a computer system when a human applies it on an
electronic pen pad, connected to the system.
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In a data warehouse, data quality is achieved by: A. cleansing. B. restructuring. C. source data credibility. D. transformation.
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