Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Printable ASCII characters range from 32 (decimal value) to 126 (if we consider spaces, otherwise from 33 to 126). In caeser cipher, when encrypting each ASCII character is shifted by an integer value. When decrypting, each character is again shifted by the integer to get the original character. For example, if key is 2 then 'a' will be shifted to 'c' while encrypting and for decryption 'c' will be shifted down to 'a'. So maximum value for key can be 94.
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