## On the Subject of Cryptography

WLMY ETGXFD EQCD ED PQKW WT CMFF EZYDFB.

SEE APPENDIX CD43 FOR AN EXCERPT OF “A CHRISTMAS CAROL”.
SEE APPENDIX CD44 FOR FREQUENT LETTERS AND WORDS.

This module will display ciphertext which contains a sentence from Charles Dickens’ “A Christmas Carol” (aka the plaintext). The plaintext has been encrypted via a substitution cipher, meaning each letter in the alphabet is substituted for a different letter.

• The letter E will always mean the letter E.
• Apart from the letter E, no letter can substitute itself.
• All punctuation has been removed from the ciphertext.
• Above the display are five keys each with a letter that is found in the plaintext.
• Once the ciphertext is decrypted, press each key only once, in order that they appear in the plaintext.
• Entering the incorrect sequence will gain a strike, try the sequence again from the beginning.

NOTE: The meaning of the word colors is currently unknown, however you can safely ignore them.

## APPENDIX CD43

Excerpt from Charles Dickens’ “A Christmas Carol”.

Scrooge knew he was dead? Of course he did. How could it be otherwise? Scrooge and he were partners for I don’t know how many years. Scrooge was his sole executor, his sole administrator, his sole assign, his sole residuary legatee, his sole friend, and sole mourner. And even Scrooge was not so dreadfully cut up by the sad event, but that he was an excellent man of business on the very day of the funeral, and solemnised it with an undoubted bargain. The mention of Marley’s funeral brings me back to the point I started from. There is no doubt that Marley was dead. This must be distinctly understood, or nothing wonderful can come of the story I am going to relate. If we were not perfectly convinced that Hamlet’s Father died before the play began, there would be nothing more remarkable in his taking a stroll at night, in an easterly wind, upon his own ramparts, than there would be in any other middle-aged gentleman rashly turning out after dark in a breezy spot -- say Saint Paul’s Churchyard for instance -- literally to astonish his son’s weak mind.

Scrooge never painted out Old Marley’s name. There it stood, years afterwards, above the warehouse door: Scrooge and Marley. The firm was known as Scrooge and Marley. Sometimes people new to the business called Scrooge Scrooge, and sometimes Marley, but he answered to both names. It was all the same to him.

Oh! But he was a tight-fisted hand at the grind-stone, Scrooge! A squeezing, wrenching, grasping, scraping, clutching, covetous, old sinner! Hard and sharp as flint, from which no steel had ever struck out generous fire; secret, and self-contained, and solitary as an oyster. The cold within him froze his old features, nipped his pointed nose, shrivelled his cheek, stiffened his gait; made his eyes red, his thin lips blue and spoke out shrewdly in his grating voice. A frosty rime was on his head, and on his eyebrows, and his wiry chin. He carried his own low temperature always about with him; he iced his office in the dogdays; and didn’t thaw it one degree at Christmas.

External heat and cold had little influence on Scrooge. No warmth could warm, no wintry weather chill him. No wind that blew was bitterer than he, no falling snow was more intent upon its purpose, no pelting rain less open to entreaty. Foul weather didn’t know where to have him. The heaviest rain, and snow, and hail, and sleet, could boast of the advantage over him in only one respect. They often ‘came down’ handsomely, and Scrooge never did. Nobody ever stopped him in the street to say, with gladsome looks, ‘My dear Scrooge, how are you? When will you come to see me?’ No beggars implored him to bestow a trifle, no children asked him what it was o’clock, no man or woman ever once in all his life inquired the way to such and such a place, of Scrooge. Even the blind men’s dogs appeared to know him; and when they saw him coming on, would tug their owners into doorways and up courts; and then would wag their tails as though they said, ‘No eye at all is better than an evil eye, dark master!’

But what did Scrooge care! It was the very thing he liked. To edge his way along the crowded paths of life, warning all human sympathy to keep its distance, was what the knowing ones call ‘nuts’ to Scrooge.

## APPENDIX CD44

Word and Letter Frequency in Charles Dickens’ “A Christmas Carol”.

Frequent 2 letter words Frequent 3 letter words
1. 16x TO
2. 11x NO
3. 10x HE
4. 9x IN
5. 8x OF
6. 7x IT
1. 23x AND
2. 22x THE
3. 22x HIS
4. 14x WAS
5. 11x HIM
6. 4x OUT
Frequent 4 letter words Frequent 5 letter words
1. 6x SOLE
2. 4x THAT
1. 4x THERE
2. 4x WOULD
Frequent 6 letter words Frequent 7 letter words
1. 4x MARLEY
1. 12x SCROOGE
Frequent 8 letter words Frequent 9 letter words