.WAFL (lâ╦@:r{Úˇ}~1ë@>RŠÍ°ntry(É;šSI8╬╦˙fYsEú r{Úˇ}~1ë@>RŠÍ°╦vurl 3http://www.u.arizona.edu/~urbancic/homework11.htmlmime text/htmlhntt"10033-6d5-3e94f20d"hvrsdata Homework #11: Cryptanalysis

Homework #11

Due 21 April 03

For tips and reminders, please refer to the Econ 452 Cryptology Page.

  1. Decipher the following line, which has been encrypted using a simple Caesar shift of an undisclosed number of places.
    BJ HWTXX YMJ WZGNHTS FY STTS
  2. The following message has been encrypted with a two line "rail fence" transposition. What does the message say (and who said it)?
    ALWSEESWLABEAIRIAEB
  3. Decrypt the following message encrypted with a VigenŔre cipher. The code word is "SECRET."
    OLGEQ TJCNV RGGBY RWLWR VKSFA WUVPM
    ZACZX XEEPF VMGPK MIPAX JYIKM RECIX
    NITPF HVCUR MWKLG NELLL GDSLL HKJEZ
    JIGRF EWPQF OBFKE YMEVI XVVLW IP
  4. Find the factors of the number 19,781 (this may take a little while).


  5. The following text is enciphered using monoalphabetic substitution. What is the plaintext (and who wrote it)?
    ZKTVS PUTWWD FUZ THXLV VKU FUZ UEXFXND TWVKXLCK NXSV SVTFQTPQ
    JPBFEBJWUS XI UEXFXNBES TFQ NTFTCUNUFV SVBWW TJJWD VKU BFVUPFUV KTS
    EPUTVUQ SXNU ILFQTNUFVTWWD FUZ NTPOUV XJJXPVLFBVBUS BF VKBS EXLPSU
    ZU ZBWW IXELS XF UEXFXNBE JPBFEBJWUS VKTV KUWJ LS LFQUPSVTFQ
    EXNJUVBVBXF TFQ HLSBFUSS SVPTVUCD BF VKUSU NTPOUVS
    
    VXJBES VX HU BFEWLQUQ BF VKU EXLPSU BFEWLQU VKU UEXFXNBES XI
    BFIXPNTVBXF CXXQS VKU VKUXPD XI VKU IBPN VKU UEXFXNBES XI
    BFVUPNUQBTVBXF JPBEU EXNJUVBVBXF JPBEU QBSEPBNBFTVBXF TFQ
    TLEVBXF VKUXPD ZU ZBWW TWSX SVLQD SXNU NTPOUVBFC BSSLUS TFQ SXNU
    HTEOCPXLQ XF BFVUPFUV VUEKFXWXCBUS SLEK TS EXNJPUSSBXF UFEPDJVBXF
    TFQ EXWWTHXPTVBAU IBWVUPBFC ZKUF PUWUATFV VX XLP LFQUPSVTFQBFC XI
    VKU UEXFXNBE JPXHWUNS
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