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THE BOLDING CIPHER

The bolding cipher is a clever way to hide a message in a block of seemingly innocuous text. The paragraph is broken up into blocks of five letters and based on the bolding treatment of those letters a coded message may be revealed. To decode simply take the letters in groups of five without regard for line, spacing, or punctuation, and translate accordingly.
abcde = A
abcde = B
abcde = C
abcde = D
abcde = E
abcde = F
abcde = G
abcde = H
abcde = I
abcde = J
abcde = K
abcde = L
abcde = M
abcde = N
abcde = O
abcde = P
abcde = Q
abcde = R
abcde = S
abcde = T
abcde = U
abcde = V
abcde = W
abcde = X
abcde = Y
abcde = Z
abcde = ?
abcde = !
abcde = [period]
abcde = [SPACE]

Caesar, when that the traitor of Egypt,
With th' honorable head did him present,
Covering his gladness, did represent
Plaint with his tears outward, as it is writ;
And Hannibal, eke, when fortune him shut
Clean from his reign, and from all his intent
Laughed to his folk, whom sorrow did torment,
His cruel despite for to dis-gorge and quit.
So chanceth it oft, that every passion
The mind hideth, by colour contrary,
With feigned visage, now sad, now merry:
Whereby if I laughed, any time or season,
It is for because I have n' other way
To cloak my care, but under sport and play.


---Sonnet 1 - William Shakespeare

THE BOOK CIPHER

This is a classic coded message technique used by many secret societies to communicate. The message is seen as sets of two numbers. The first number refers to the page number and the second number refers to the number of the word on that page. For example 43-15 would mean to look on the 43rd page and find the fifteenth word on that page. All the words together form the message. 

The trick is knowing the correct book. The book is the key.

Books I like to use are:

1997 Hardcover edition of "The Ultimate Hitchhiker's Guide" by Douglas Adams "Complete and Unabridged"

1927 Edition of "The Complete Sherlock Holmes" by Sir Arthur Cannon Doyle

SUBSTITUTION CIPHER

A substitution cipher is a relatively simple way to encode a message where certain letters of the alphabet are substituted for others. Like saying B is M and C is N and so forth.  For more complexity a keyword can be used. For example, lets say the keyword is "ZEBRAS". This means ZEBRAS translates with the first letters of the alphabet and the remaining letters are slotted in order. See below. In this example A=Z, B=E, etc.

ABCDEFGHIJKLMNOPQRSTUVWXYZ
ZEBRASCDFGHIJKLMNOPQTUVWXY

These can be very tricky to crack without the keyword.

THE PIGPEN CIPHER
This is a great substitution cipher that looks like a really complex alien language. The letters are substituted for their part of the relative shape. See Diagram.


THE LYRICS CODE

This is a great "pop culture" coded language especially good for communicating with mysterious lovers. The crux of the initial message is removed in one degree by a song association. You send someone a selection of a song lyric which does not give away the title, yet is sufficiently recognizable that the title might be guessed or Googled. The title is actually what you want to say. The result is a delightfully mysterious amalgamation of double entendres. Allow me to demonstrate. 

A: How glad the many millions of Annabelles and Lillians would be...
FROM THE SONG: I've got a crush on you.

B: They say that bears have love affairs, and even camels
FROM THE SONG: Let's Misbehave

A: The words that fill my heart, my lips can't seem to say
FROM THE SONG: I Dream of You.

B: My heart should be well-schooled
FROM THE SONG: I Fall in Love too Easily

A: Dawn is nearing, time is fleeing
FROM THE SONG: Mind if I Make Love to You?

B: I dreamed you would hold me, now really enfold me.
FROM THE SONG: Take Me

THE KEYBOARD CYPHER

This is a relatively simple cipher, and the solution is right in front of you. Each letter in a coded message is simple shifted one direction, either left or right on the standard QWERTY keyboard. If there is no letter next to the one you need, such to the left of "A", simply use the letter from the other side, in this case "L".

The message: 
Hide the body in the cellar until I get home.

Becomes: 
gusw rgw vist ub rgw xwkkle ybruk u fwr ginw

For a more difficult cipher evenly divide the coded letters:

"GUSWR GWVIS TUBRG WXWKK LEYBR UKUFW RGINW"
HIDET HEBOD YINTH ECELL ARUNT ILIGE THOME


THE INVENTOR'S CIPHER

The inventors cipher codes a message through the creations of famous inventors. It is good for short messages and can be camouflaged as a sort of ambiguous laundry list. The object is translated to the inventor, and the first letter of their last name forms the message. In this example the first invention is the Zeppelin. With some research we find that this is attributed to David Schwarz, so the first letter in our message is "S".

Things to Get:

Zeppelin
Induction Motor
FM Radio
Cylinder Lock

Wireless Remote Control
Artificial Heart
Windshield Wiper Blade
Bell Helicopter

When all the inventions are translated, it becomes obvious the message is :STAY AWAY

Notice how this message uses the letter "A" three times. Three separate inventors were used. Also multiple inventions from the same person may be substituted, but it is not recommended to use the same invention twice.

For further confusion, certain words in the list can be crossed off, underlined, circled or otherwise denoted as a distraction. It doesn't matter as long as the word is legible.

THE DATE CIPHER
(Or as I like to call it): THE VICTIM'S BIRTHDAY CIPHER

6/1/1926

For this example I'm choosing the birth date of Norma Jeane Baker, better known as Marilyn Monroe. June Fisrt 1926.

In the order of Month, Day, Year write the string of numbers out without the slashes (excluding any zeros).

611926

Then repeat the number sequence for as long as your message is. Each letter will be differed down the alphabet according to the number it coincides with.

611 9266 11926 6119 266 1192
YOU WILL NEVER FIND THE BODY

The first letter is "Y" and it is substituted with a letter six spaces away. Once you get to the end of the alphabet you start again, so we end up with "E".

EPV FKRR OFEGX LJOM VNK CPMA

As always, feel free to group the letters in odd ways to confuse people. Or if you don't feel like dropping the date, group the letters in your number sequence (if you have enough letters)

EPVFKR R O FEGXLJOMV NK CPMA