f35-frosh-sem-crypto-handout

f35-frosh-sem-crypto-handout - Handout Decoding a Key-Based...

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Apr. 2011 Cryptography Handout Some Simple Cryptograms Cipher: YHPARGOTPYRC OT EMOCLEW Plain: ----------------------- Cipher: EHT YPS WSI RAE GNI LBA CEU TAO Plain: --- --- --- --- --- --- --- --- Cipher: ICCRAANCTKBEEDLTIHEIVSECYOODUE Plain: ------------------------------ Cipher: SSA PSE TJX SME CRE STO THI GEI Plain: --- --- --- --- --- --- --- --- 1 2 3 4 5 6 7 8 Cipher: AMY TAN’S TWINS ARE CUTE KIDS Plain:
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Apr. 2011 Cryptography Handout Simple Substitution Ciphers Decipher the following text, which is a quotation from a famous scientist. Clue: Z stands for E “CEBA YUC YXSENM PDZ SERSESYZ, YXZ QESOZDMZ PEJ XQKPE MYQGSJSYA, PEJ S’K ECY MQDZ PLCQY YXZ RCDKZD.” PBLZDY ZSEMYZSE “CEBA YUC YXSENM PDZ SERSESYZ, YXZ QESOZDMZ PEJ XQKPE MYQGSJSYA, PEJ S’K ECY MQDZ PLCQY YXZ RCDKZD.” PBLZDY ZSEMYZSE E E E E E , E E E .” E E E --- -- ---- -- ---- --- ------ -- ------- , -- ---- -- --- ----- --------- --- - - --- --- ----- -- ---- -
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Apr. 2011 Cryptography Handout
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Apr. 2011 Cryptography
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Unformatted text preview: Handout Decoding a Key-Based Cipher A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Agreed upon secret key: freshman __ __ __ __ __ __ __ __ __ __ __ __ __ __ Secret key: f r e s h m a n f r e s h m 05 17 04 18 07 12 00 13 05 17 04 18 07 12 Sum: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Modulo 26 sum: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Cipher text: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Decipher the coded message and provide a reply to it using the same key Message: B Y E L P E Y B Z I R S T Q 01 24 04 11 15 04 24 01 25 08 17 18 19 16 Secret key: f r e s h m a n f r e s h m 05 17 04 18 07 12 00 13 05 17 04 18 07 12 Difference: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Modulo 26 diff.: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Plain text: __ __ __ __ __ __ __ __ __ __ __ __ __ __ Reply: _ _ _ _ _ _ _ _ _ _ _ _ _ _...
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f35-frosh-sem-crypto-handout - Handout Decoding a Key-Based...

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