Which technique is used in each of the following cases

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Reference no: EM132151546

Which technique (cryptography or steganography) is used in each of the following cases for confidentiality?

a) A student writes the answers to a test on a small piece of paper, rolls up the paper, and inserts in a ball-point pen, and passes the pen to another student.

b) To send a message, a spy replaces each character in the message with a symbol that was agreed upon in advance as a character's replacement.

c) A company uses special ink on its checks to prevent forgeries.

d) A graduate student uses watermarks to protect her thesis, which is posted on her website.

Reference no: EM132151546

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