Cryptography 101
-
Upload
andyfisher -
Category
Education
-
view
2.914 -
download
2
description
Transcript of Cryptography 101
![Page 1: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/1.jpg)
Cryptography 101
![Page 2: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/2.jpg)
The vocabulary of codes
Anagram – letters of a word rearranged to say something else
![Page 3: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/3.jpg)
bilateral – a code containing just 2 symbols
![Page 4: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/4.jpg)
Cipher – a code in which each letter or number is represented by another letter or number
![Page 5: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/5.jpg)
Code – the general term for any system that changes a message to make it harder or easier to understand
![Page 6: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/6.jpg)
Cryptography – the art of writing coded messages
![Page 7: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/7.jpg)
encryption – the act of concealing something by turning it into code
![Page 8: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/8.jpg)
hieroglyphics – coded picture writing
![Page 9: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/9.jpg)
key – the solution that allows you to decipher a coded message
![Page 10: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/10.jpg)
Plaintext – the original message
![Page 11: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/11.jpg)
3 simple codes to warm you up!
![Page 12: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/12.jpg)
1: Reverse Codes
![Page 13: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/13.jpg)
Full reverse
DEHCTAW GNIEB SI ESUOH EHT EDISNI YATS
Individual words
YATS EDISNI EHT ESUOH SI GNIEB DEHCTAW
Letter pairs
TSYA NIISED HTH EUOES SI EBNIW GTAHCDE
![Page 14: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/14.jpg)
WEOL RDKD FIR MOEMHTT HO ET OEUDTIS
![Page 15: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/15.jpg)
WORK FROM THE OUTSIDE TO THE MIDDLE
![Page 16: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/16.jpg)
2: Number Codes
![Page 17: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/17.jpg)
A – 1, B – 2 , C – 3 etc
JOT = 10 / 15 / 20
![Page 18: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/18.jpg)
20 8 5 / 19 5 3 18 5 20 / 6 9 12 5 19 /
1 18 5 / 9 14 / 20 8 5 / 19 1 6 5
![Page 19: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/19.jpg)
THE SECRET FILES ARE IN THE SAFE
![Page 20: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/20.jpg)
3: Vowel Codes
![Page 21: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/21.jpg)
A E I O U
![Page 22: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/22.jpg)
YUAR SICRIT PERCIL WOLL ERROVI UN MUNDEY MURNONG
![Page 23: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/23.jpg)
YOUR SECRET PARCEL WILL ARRIVE ON MONDAY MORNING
![Page 24: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/24.jpg)
Simple COMBINATION Codes
Reverse codesNumber codesVowel codes
![Page 25: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/25.jpg)
UNWRCOSHHCUUL
![Page 26: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/26.jpg)
UNWRCOSHHCUUL
Hint – 2 stage process using pair reversal and vowels
![Page 27: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/27.jpg)
ON WR CI SH HC OO L
NO RW IC HS CH OO L
UN WR CO SH HC UU L
![Page 28: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/28.jpg)
The code breaker’s challenge
There are 9 parts to the code maker’s challenge – each step will give you part of a master key which you will need to crack the
final code...and win a prize!
![Page 29: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/29.jpg)
The code breaker’s challengePart 1
A mysterious letter has arrived on your doormat. It has an Egyptian postmark, and very neat, old-fashioned handwriting on the
envelope. Inside is a single thin piece of paper, and written on it is a coded message:
W R O T I U A T T H I E L P H E B I T
![Page 30: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/30.jpg)
Greek Codes
![Page 31: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/31.jpg)
The Spartan Scytale
![Page 32: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/32.jpg)
Aeneas’ light hole code
![Page 33: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/33.jpg)
Polybius grid code
![Page 34: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/34.jpg)
1 2 3 4 51 A B C D E2 F G H I / J K3 L M N O P4 Q R S T U5 V W X Y Z
A = 11, B = 12, S = 43, Y = 54
![Page 35: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/35.jpg)
54 34 45 42 / 13 34 51 15 42 / 24 43 / 12 31 34 52 33 / 42 15 44 45 42 33 / 44 34 /
12 11 43 15 / 11 44 / 34 33 13 15
![Page 36: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/36.jpg)
Y O U R / C O V E R / I S / B L O W N / R E T U R N / T O /B A S E / A T / O N C E
![Page 37: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/37.jpg)
The code breaker’s challengePart 2
After playing with your computer for several hours, you feel it’s time to take a break. You go
to get a drink – but when you return, you realise instantly that someone has used the
machine while you were away. A strange sequence of numbers has been typed out
across the screen, and written beneath is the following message – ‘you’ve been flamed’
![Page 38: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/38.jpg)
1424512414154423151131352311121544
243344343511244243113314
213124351511132335112442
114234453314
![Page 39: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/39.jpg)
Caesar’s code
![Page 40: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/40.jpg)
Letter shift version (3)
KHOOR IHOORZ FRGH EUHDNHUV
A B C D E F G
A B C D E F G
![Page 41: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/41.jpg)
Keyword version
A B C D E F G H I J
F I S H E R A B C D
K L M N O P Q R S T
G J K L M N O P Q T
U V W X Y Z
U V W X Y Z
C FK F TEFSBEP WCTB F QBCLY BEFH !
![Page 42: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/42.jpg)
Keyword protection
![Page 43: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/43.jpg)
The Freemasons’ code
![Page 44: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/44.jpg)
![Page 45: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/45.jpg)
![Page 46: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/46.jpg)
The code breaker’s challengePart 3
Your computer lets you know that someone has sent you an email. The address f the
sender seems to be somewhere in Egypt. The message reads as follows:
YPLQQ / LAA / SDO / HOSSOPQ / CJ / SDO / JOWS / SDPOO / YLBOEPOKGOPQ /
YDKHHOJRO / KJQVOPQ
![Page 47: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/47.jpg)
Written below this are what appear to be six random words:
ComputerSoftwareTerminalKeyboard
HackerMouse
![Page 48: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/48.jpg)
Renaissance Codes
![Page 49: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/49.jpg)
Bacon’s Bilateral codea AAAAA g AABBA n ABBAA t BAABAb AAAAB h AABBB o ABBAB u-v BAABBc AAABA I-j ABAAA p ABBBA w BABAAd AAABB k ABAAB q ABBBB x BABABe AABAA l ABABA r BAAAA y BABBAf AABAB m ABABB s BAAAB z BABBB
Every ‘marked letter’ represents ‘B’Every ‘unmarked’ letter represents ‘A’
Marking can include – underlining, italics, size differences, capitalisation, pin pricking, invisible ink
![Page 50: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/50.jpg)
How wonderful it was to see you last weekend. I hope you enjoyed our day in London as much as I did.
How wonderful it was to see you last weekend. I hope you enjoyed our day in London as much as I did.
![Page 51: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/51.jpg)
How wonderful it was to see you last weekend. I hope you enjoyed our day in London as much as I did.
Babba abbab baabb aaaaa baaaa aabaa abaaa
Abbaa aaabb aaaaa abbaa aabba aabaa baaa aaaaa
You are in danger
![Page 52: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/52.jpg)
The Vigenere tableau
1) Choose a keyword : MANCHESTER
2) Above your message write out the keyword repeatedly
m a n c h e s t e r m a
s e n d s u p p l i e s
3) Using the plaintext on the ‘x’ axis of the tableau and the keyword letters on the ‘y’ axis, compose the coded message
(without the keyword, this is almost unbreakable)
![Page 53: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/53.jpg)
![Page 54: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/54.jpg)
SEND
MANCHESTER
![Page 55: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/55.jpg)
m a n c h e s t e r m a
s e n d s u p p l i e s
E E A
![Page 56: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/56.jpg)
EEAF WLBPYKLW
![Page 57: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/57.jpg)
To decipher, you simply reverse the rules by writing the keyword repeatedly above the coded message
Then take the first letter of the keyword on the ‘x’ axis and follow the tableau down until it meets the code letter
Read across to the ‘y’ axis to identify the original plaintext
m a n c h e s t e r m a
e e a f w l b p y k l w
S E
![Page 58: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/58.jpg)
Keyword = SOAP
TFODCSKANGOKH
KHRTWHFSIVZPOJJG
UCRDFOTXGBSBD
KWDTZCLAQZCMT
Use the Vigenere tableau to crack these 10 words – when considered together you will be able to identify 5 popular TV soap operas
![Page 59: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/59.jpg)
Modern Cryptology
![Page 60: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/60.jpg)
Frequency tables
E T A O N R I S H D L G C M U F Y P W B V K X J Q Z
Single letter words - I or A in English
Double letters tend to be – B D E F G L M N O P R S T
Look out for short words from which you can make educated guesses
Combine deduction, common sense, patience and guess work!
Above all else – keep your key up to date
![Page 61: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/61.jpg)
The code breaker’s challengePart 4
Someone has tucked 4 coded messages inside your bag when you were not looking. The first
3 are written using different codes. The 4th uses the same code as one of the first 3 and
contains the answer you need for this part of the challenge.
![Page 62: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/62.jpg)
CODE 1:
P OMUPNQMU GPK AN SATTUH AHNATU OSU JPD
OMUU HUPM OSU WUNOUMH WPFF JR OSU RAUFT
Clues: O = T, A = I, G = M, N = S
- -------- --- -- ------ ------ --- --- ----
---- --- ------- ---- -- --- -----
![Page 63: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/63.jpg)
CODE 2:
TDMRM FS C SMNRMT PCSSCBM IMTWMML TDM SKUBBJMRS NCVM CLE
TDM OJE DOUSM
Clues: The letters from P-Z have not changed
----- -- - ------ ------- -------
--- --------- ---- --- --- --- -----
![Page 64: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/64.jpg)
CODE 3:
JSST JS DK TCS QNNJ ISCDKM TCS RSLQST MNNQ DK TCS INNGLFRS FKM JFGS RUQS
KNINMY RSSR YNU
Clues: F = A, Q = R
---- -- -- --- ---- ------ --- ------ ---- -- ---
-------- --- ---- ---- ------ ---- ---
![Page 65: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/65.jpg)
CODE 4:
TDM WORE YOU LMME TO WRFTM EOWLCS TDM CLSWMR DMRM FS DOT
Clues: E = D
--- ---- --- ---- -- ----- ---- -- --- ------
---- -- ---
![Page 66: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/66.jpg)
![Page 67: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/67.jpg)
The code breaker’s challengePart 5
You receive a message at school, telling you to go to the OMR. When you get there you find the following message scrawled on the wall…
![Page 68: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/68.jpg)
Sir ArthUR ConAn doyLe WaS the CreatOr of The wOrlD’s GreaTesT deTeCtiVe shErlOck holMEs. ConAn DOylE was BORn iN edInBurgH, AnD Although HE studied medIcINe, hE SOoN turned To WriTInG. Sherlock hoLMEs fiRST ApPEaRed In thE Novel a sTudy In sCarlet, WhiCH wAs NArrateD By HiS friEnd Dr jOhN h. wAtsoN. thE detecTIvE soon BEcaMe famous fOr hIs BrilLIaNT skills oF DeDUCtIon, AS WeLL AS fOR HiS fIery Character. His arch-ENEmy Was tHE EviL professor MORiArty. Holmes waS So PoPulaR that eVeN afTer hE seemed to FAlL to HiS DeaTh during a FigHt AbovE A wATerfall, cONan dOylE was fORCed tO BRInG hiM back AfTeR A hUgE PuBlIC oUTcRy.
![Page 69: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/69.jpg)
Crossword Codes
![Page 70: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/70.jpg)
1) Both sender and receiver must have the same blank crossword.
2) The message is written from left to right in the blank squares.
3) The code is then achieved by copying out the text again, but this time working vertically.
4) To decipher the message it must be written into the blank grid vertically but read off horizontally.
![Page 71: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/71.jpg)
T H I S M E T
H O D O F
C R E A T I N G A C
O D E I S
S I M P L
E B U T V E R
Y E F F E
C T I V E
This method of creating a code is simple but very effective
HCOEY TRSC HOEDBET AI IDTUFV SIEME MNT EOGIPVF TAE FCSLRE
![Page 72: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/72.jpg)
The code breaker’s challengePart 6
A strange looking card arrived in the post this morning – addressed to you, with an Egyptian
stamp on it. On one side, it has the code: 20 / 9 / 13 / 5 / 19
On the other side it says:
LNTSWTES CSNE OAFTFHGAR NIIEI GTONCS RGHENF ATAAL TIRHTLTSY UGHX OEIRHLIW
![Page 73: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/73.jpg)
Examining the postcard more closely you find a clue written underneath the stamp: the word
‘newspaper’.
The following grids appeared in national newspapers on the day the card was posted. Fill the correct grid vertically to read off a horizontal
message – the answer is a kind of insect.
![Page 74: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/74.jpg)
Daily Telegraph
![Page 75: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/75.jpg)
The Times
![Page 76: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/76.jpg)
Daily Mirror
![Page 77: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/77.jpg)
Daily Express
![Page 78: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/78.jpg)
Typewriter codes & the history of QWERTY
![Page 79: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/79.jpg)
One to the leftOne to the right
One aboveOne below
Alternate between one or more of these variations with key
![Page 80: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/80.jpg)
QGLR AIYBS SIWA L NIBJWT VINV NLJW QGWB UR WZOKISWA?
![Page 81: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/81.jpg)
![Page 82: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/82.jpg)
HWHMMMMK !
![Page 83: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/83.jpg)
![Page 84: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/84.jpg)
The code breaker’s challengePart 7
You are taking your laptop out of the cupboard to work on some homework for school, when you notice a sheet of paper taped to the underside.
The printed message reads:
DVLWW LRR BYC OQWB WCFCH OCBBCVW
![Page 85: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/85.jpg)
Sherlock Holmes & the dancing men
![Page 86: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/86.jpg)
![Page 87: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/87.jpg)
The code breaker’s challengePart 8
You are visiting a museum at 221B Baker street on a school trip, when you stumble across an old piece of paper. It looks like a coded letter made
up of odd looking stick men.
Clues: How do letters usually start?Who is the letter to and from?
![Page 88: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/88.jpg)
At school the next day, you are browsing through the library when you come across a folded piece of paper with your name on it, sticking out of an
anthology of detective fiction.
Upon opening it, you discover another set of dancing men – could this bring you one step
closer to cracking the master code?
![Page 90: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/90.jpg)
The code breaker’s challengePart 9
This morning you found a list scrawled on the back of one of your exercise books. None of your
friends or family has owned up – is this list of purchases as innocent as it looks>
Clues: The code is hiding a 7 letter word.
![Page 91: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/91.jpg)
Newspaper’s bill £5Dry cleaning £8Take away pizza £7Light bulbs £3Fridge magnet £2Car-park token £2Cinema ticket £5
![Page 92: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/92.jpg)
The final code breaker’s challenge!
![Page 93: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/93.jpg)
![Page 94: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/94.jpg)
QR codes
![Page 96: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/96.jpg)
![Page 97: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/97.jpg)
The Vaudeville telepathy act
![Page 98: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/98.jpg)
The GReY code
![Page 99: Cryptography 101](https://reader033.fdocuments.in/reader033/viewer/2022061219/54ba00cd4a7959092e8b45bb/html5/thumbnails/99.jpg)
Pick a card...any card