Encryption is the process of:
a. detecting errors in messages by means of mathematical rules
b. disguising information by the use of mathematical rules, known as algorithms
c. preventing errors in messages by means of logical rules
d. transmission of information over secure lines in analog form to prevent illegal access
e. correcting errors in message by means of mathematical rules

b.

Explanation:

disguising is a bit of a misleading term here. But basically, yeah, you're replacing one message by an 'encrypted' message, using mathematical rules. To reconstruct the original message, you'll need some key data and the inverse mathematical rules.

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