The Mammoth Book of Secret Code Puzzles, by Elonka Dunin

The Mammoth Book of Secret Code Puzzles
Sample Puzzles

Easy (over 400 puzzles at this level of difficulty):

(#1) Fy hbmrluopihg im ptop wtrgrurl hgr jrlmhg im vhqge oerkqopr ph ptr eimstolar hv o eqpy... ip im whlmr rxrsqpre by pwh jrlmhgm, oge msolsrdy ehgr op odd iv ptlrr hl fhlr olr rfjdhyre ptrlrig. Arhlar Womtigaphg
(key: OBSERVATION)
(#9) Hqjlqhhuv olnh wr vroyh sureohpv. Li wkhuh duh qr sureohpv kdqglob dydlodeoh, wkhb zloo fuhdwh wkhlu rzq sureohpv. . Vfrww Dgdpv
(Hint: Caesar shift: +3)

Not so easy (over 40 puzzles at this level):

(#5) WVIIR NTRNA ERWAD ONEEE NNLEH WDKWS OCEUE XCRPT DGEOD EIERE VTRXA OEHIL IROPT LLMEO PXNBA EFENL NEHVD ULFEX NTCWW CNDTA OEPSO IAXEA EOETE AMCUS ETPNC X
(Hint: transposition cipher. Encrypted in 7-character rows)

Challenging (over 100 puzzles at this level):

(#3) D W S J R R K I S G M S L K H D A Y Q R S R M I M J R D S I U J S T S Q C M E H Y D J N S V K P K N W K I M J H Y J E K J T F K C J Q K J
(Hint: substitution cipher. The plaintext contains the word .policy.)

Fiendish (over 40 puzzles at this level):

(#2) Vvf idg cg QZDCM qckdqzpu his xkbe; weu hfonjwou djcvzo, vvffphcss, mg ffultrfr lu o dftowoow qtgsyus. Frdios Rtlythcc
(hint: Vigenere cipher. The first letter of the key is "C")

Page created: December 22, 2005, last modified April 3, 2006