Write a simple encryption/decryption program

Cryptography, or cryptology is the practice and study of techniques for secure communication in the presence of third parties called adversaries. Until modern times, cryptography referred almost exclusively to encryption, which is the process of converting ordinary information (called plaintext) into unintelligible form (called ciphertext). Decryption is the reverse, in other words, moving from the unintelligible ciphertext back to plaintext. A cipher (or cypher) is a pair of algorithms that carry out the encryption and the reversing decryption. For this assignment you will write a simple encryption/decryption program called GMUCipher. A GMUCipher uses a document as the cipher key, and the cipher itself uses numbers that reference the words within the text. For example, we can use an edition of The Declaration of Independence as the cipher key. The cipher you will write will use a pair of numbers corresponding to each letter in the text. The first number denotes the position of a word in the key text (starting at 0), and the second number denotes the position of the letter in the word (also starting at 0). For instance, given the following key text (the numbers correspond to the index of the first word in the line): [0] ‘Twas brillig, and the slithy toves Did gyre and gimble in the wabe; [13] All mimsy were the borogoves, And the mome raths outgrabe. [23] “Beware the Jabberwock, my son! The jaws that bite, the claws that catch! [36] Beware the Jubjub bird, and shun The frumious Bandersnatch!” [45] He took his vorpal sword in hand: Long time the manxome foe he sought—” The word “computer” can be encoded with the following pairs of numbers: 35,0 catch 5,1 toves 43,3 frumious 48,3 vorpal 22,1 outgrabe. 34,3 that 23,6 “Beware 7,2 gyre Placing these pairs into a cipher text, we get the following: 35,0,5,1,43,3,48,3,22,1,34,3,23,6,7,2 If you are encoding a phrase, rather than just a single word, spaces in the original English phrase will also appear in the ciphered text. So, the phrase “all done” (using the above Jabberwocky poem) might appear as: 0,3,1,4,13,1 6,0,46,2,44,2,3,2 Only spaces in the key text should be considered delimiters. All other punctuation in the key text is to be considered part of a key word. Thus, the first word in the Jabberwocky poem, ‘Twas, will have the following characters and positions for key word 0: Position 0: ‘ Position 1: T Position 2: w Position 3: a Position 4: s Please read the Description for all details, and check the Rubric for all requirements.

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