BOOK CIPHER

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BOOK CIPHER
>>A book cipher, or Ottendorf cipher, is a cipher in which the key is some aspect of a book or other piece of text. Books, being common and widely available in modern times, are more convenient for this use than objects made specifically for cryptographic purposes. 

Sa cipher na'to, both the sender and recipient of the message are required to have exactly the same piece of text. Each letter (or word) of the plaintext is replaced by a code indicating the position of the letter/word in the chosen text. Yung text na gagamitin mo pwedeng libro, webpage, or kahit isang sentence, or pwede ding lyrics ng isang kanta.

For example,

Whenever I dress cool,
My parents put up a fight
And if I’m a hotshot,
Mom will cut hair at night
In the morning I’m sure of my identity
I scream Mom and Dad
Why can't I be who I wanna be?

I just wanna be myself,
And I want you to love me for who I am
I just wanna be myself,
And I want you to know, I am my Hair

I’ve had enough
This is my prayer
That I’ll die living just as free as my hair

Yan yung text na gagamitin ko. Lyrics yan ng kanta ni lady gaga that is entitled "Hair".

Then for example yung plaintext mo ay "I LIKE CAKE". To encode your plaintext kailangan mong hanapin yung bawat letters ng plaintext mo dun sa napili mong text and then choose how to identify their location.

In this case the letter will be identified by LINE#-WORD#-LETTER#. Taking the "I" from the first line we would reference it as: L1W2L1 or as 1-2-1.

Since yung letter I ay makikita niyo sa first line and yun ung second word sa 1st line and pang first letter siya sa word na yun kaya naging 1-2-1.

Next is yung letter "L" looking in our text above makikita niyo yung letter L (sa word na myself) sa 10th line nung lyrics. And yung word kung nasan yung letter L ay pang 5th word sa line na yun and yung letter L ay pang 5th letter sa word nayun kaya siya naging 10-5-5.

(c)Réa

>So, hindi ko siya totally gamay but I hoped this reference will help you a lot through the source of Ate Rea.

Additional example:

Additional example:

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