Which technique (cryptography or steganography) is used in each of the following

Question

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 ballpoint 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.

Explanation / Answer

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

message hiding is used

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. cryptography

encryption key is used

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

data hiding using ink

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

use of images

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