SwapCipher is a simple cipher that works by swapping each pair of alphanumeric characters in the given message. For example, if we encode this message "today, we attack at dusk", it becomes otady, ew taakc ta udks" Write a function swapCipher(s) which given a string s returns a copy of the string applying the swap cipher algorithm. assert(swapCipher("i love 15112) == "i olev 51112") assert(swapCipher("*watch the, symbols!) == "*awcth hte, ysbmlos!")

SwapCipher is a simple cipher that works by swapping each pair of alphanumeric characters in the given message. For example, if we encode this message "today, we attack at dusk", it becomes otady, ew taakc ta udks" Write a function swapCipher(s) which given a string s returns a copy of the string applying the swap cipher algorithm. assert(swapCipher("i love 15112) == "i olev 51112") assert(swapCipher("watch the, symbols!) == "awcth hte, ysbmlos!")

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Substitution Cipher is an old technique that substitutes one thing for another. For example, alphabet messages can be ciphered by applying the following substitution. plaintext: abcdefghijklmnopqrstuvwxyz | | V Vciphertext: mnbvcxzasdfghjklpoiuytrewq However, this type of ciphering produces patterns since the same plaintext strings produce the same cipher text. Polyalphabetic Cipher, on the other hand mitigates this problem as plaintext characters are not always replaced with the same cipher text character. The replacement of each character dependson a key as well as on the position of the character in the text; for example, by using a formula such as: for (int i=0; i < length of P; i++) C[i] = P[i] + K + (i mod 3) In essence, if the key, K, is choses as K=10, then 10 is added to characters in position 0, 3, 6, …; and 11 is added for those in…
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