Which technique (cryptography or steganography) is used in each of the following cases for confidentiality?A. To send a message, a spy replaces each character in the message with a symbol that was agreed upon in advance as the character’s replacement.B. A company uses special ink on its checks to prevent forgeries.

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Which technique (cryptography or steganography) is used in each of the following cases for confidentiality?
A. To send a message, a spy replaces each character in the message with a symbol that was agreed upon in advance as the character’s replacement.
B. A company uses special ink on its checks to prevent forgeries.

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