The Codebreaker’s Challenge

The Codebreaker’s Challenge contains four cryptograms on which you can try out the skills you’ve learned in the book. Each cryptogram is supposed to be tougher than the previous one, but please move on if you get stuck. Note that the solutions to the encrypted messages are not listed anywhere, so the only way for you to crack the messages is to use your ingenuity and determination. The methods for analyzing each cryptogram are in the book. Good luck and happy cracking!

CRYPTOGRAM 1: CAESAR SHIFT CIPHER (EASY)

L FDQQRW IRUHFDVW WR BRX WKH DFWLRQ RI
UXVVLD LW LV D ULGGOH ZUDSSHG LQ D
PBVWHUB LQVLGH DQ HQLJPD

ZLQVWRQ FKXUFKLOO

CRYPTOGRAM 2: CAESAR SHIFT CIPHER (HARDER)

OXGB OBWB OBVB

CNEBNL VTXLTK

CRYPTOGRAM 3: MONOALPHABETIC SUBSTITUTION CIPHER

EVA KRC BEOA TRNZEVA CPR BWTFCOWV OB DK VW UREVB BW AOLLOGFTC EB KWF UONPC DR TRA CW OUENOVR LZWU CPR LOZBC PEBCK OVBXRGCOWV WL CPR GPEZEGCRZB CPRBR GPEZEGCRZB EB EVK WVR UONPC ZREAOTK NFRBB LWZU E GOXPRZ CPEC OB CW BEK CPRK GWVHRK E UREVOVN DFC CPRV LZWU IPEC OB SVWIV WL SOAA O GWFTA VWC BFXXWBR POU GEXEDTR WL GWVBCZFGCOVN EVK WL CPR UWZR EDBCZFBR GZKXCWNZEXPB O UEAR FX UK UOVA EC WVGR CPEC CPOB IEB WL E BOUXTR BXRGORB BFGP PWIRHRZ EB IWFTA EXXREZ CW CPR GZFAR OVCRTTRGC WL CPR BEOTWZ EDBWTFCRTK OVBWTFDTRIOCPWFC CPR SRK

LZWU CPR NWTA DFN DK RANEZ ETTEV XWR

CRYPTOGRAM 4: VIGENÈRE CIPHER

C U D R Y H S O D B O D G R Z A F D N R F C R Q T E L C T H N V X S O H S G N N B Z N S R R Q J H V R O O C L N T W H R E L H H P E L N G I O E W H R P O A R A F O Z S U G H R U H W N V T U H S B Q O S E E A M A Z L N O D B O D G R D W R D L G K Y Y R N Q R N O D N X H R U H A C S L V H D U L S T H N V X S G R M N Q Y C U O O O E Z V H V V I A Y E A W I B Q S V Q C Y X D R W H R V P R H D B P E G H R N Q D G K E P R W P D T P K E E

More cryptograms can be found at

www.simonsingh.net/cryptography/cryptograms/