What is the purpose of the hash function?

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Secure hash function (one-way hash function) is not only used in message authentication but in digit signatures (Stallings & Brown, 2008, p. 54).
Using the APA writing style, write a 2– 3-page paper that answers the following questions:
What is the purpose of the hash function?
How is it useful to message authentication?
What are the 7 main characteristics that are needed for a secure hash function?
How is a hash function considered a weak or strong function?

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