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1. The ciphertext printed below was encrypted using a substitution cipher. The objective is to
decrypt the ciphertext without knowledge of the key. a. Provide the relative frequency of all
letters A...Z in the ciphertext. b. Decrypt the ciphertext with help of the relative letter frequency
of the English language (e.g., search Wikipedia for letter frequency analysis). Note that the text
is relatively short and might not completely fulfill the given frequencies from the table. c. Find
the key and provide the plaintext. Ciphertext: CKCLBAELDK DGJ LFNSMBCA CGQEGCCAI
JCUCKFS DGJ LACDBC SAFJMLBI BHDB LHDGQC BHC OFAKJ DGJ NDVC FMA
KEUCI CDIECA BHC LCKK SHFGCI OC JCSCGJ FG BHC LFNSMBCAI MICJ EG
GDBEFGDK ICLMAEBR DGJ BHC CKCLBAELDK IRIBCNI BHDB NDVC FMA LDAI
FSCADBC OCAC DKK LACDBCJ TR CKCLBAELDK DGJ LFNSMBCA CGQEGCCAI DB
OSE OC VCCS BHDB SAFQACII NFUEGQ PFAODAJ OEBH FMA EGGFUDBEUC
ACICDALH DGJ FMB-FP-BHC TFY DSSAFDLHCI BHC JCSDABNCGB FP
CKCLBAELDK DGJ LFNSMBCA CGQEGCCAEGQ DB OSE LHDKKCGQCI IBMJCGBI
BF SMIH BHCNICKUCI BF MGJCAIBDGJ IFLECBRI DGJ BCLHGFKFQRI LFNSKCY
EIIMCI EG D TAFDJCA LFGBCYB BHDG OHDBI EG PAFGB FP BHCN OC ODGB FMA
IBMJCGBI OHCBHCA BHCR DAC CDAGEGQ DG MGJCAQADJMDBC NEGFA FA D
JFLBFADBC BF BDLVKC IFLECBRI NFIB SACIIEGQ SAFTKCNI DGJ MGLFUCA GCO
ODRI FP IFKUEGQ BHCN OHCBHCA EBI JCUCKFSEGQ IRIBCNI BHDB LDG KFLDBC
PEACPEQHBCAI EG BHC NEJJKC FP D TMAGEGQ TMEKJEGQ FA LACDBEGQ
GCMAFSAFIBHCBELI BHDB KFFV DGJ PMGLBEFG KEVC GDBMADK KENTI FMA
PDLMKBR DGJ IBMJCGBI DAC DB BHC PAFGB CJQC FP ACNDAVDTKC
EGGFUDBEFG OHEKC DJUDGLEGQ BCLHGFKFQECI EI DB FMA LFAC OC DKIF
BDVC HMNDG LFGGCLBEFGI UCAR ICAEFMIKR EG CLC OC SAEJC FMAICKUCI FG
BHC PDNEKR-KEVC DBNFISHCAC OC LMKBEUDBC; PDLMKBR IBMJCGBI DGJ
IBDPP CGLFMADQC CDLH FBHCAI CUCAR IMLLCII DGJ DAC BHCAC PFA BHC
LHDKKCGQCI TFBH EG BHC LKDIIAFFN DGJ EG KEPC

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1. The ciphertext printed below was encrypted using a substitution ci.pdf

  • 1. 1. The ciphertext printed below was encrypted using a substitution cipher. The objective is to decrypt the ciphertext without knowledge of the key. a. Provide the relative frequency of all letters A...Z in the ciphertext. b. Decrypt the ciphertext with help of the relative letter frequency of the English language (e.g., search Wikipedia for letter frequency analysis). Note that the text is relatively short and might not completely fulfill the given frequencies from the table. c. Find the key and provide the plaintext. Ciphertext: CKCLBAELDK DGJ LFNSMBCA CGQEGCCAI JCUCKFS DGJ LACDBC SAFJMLBI BHDB LHDGQC BHC OFAKJ DGJ NDVC FMA KEUCI CDIECA BHC LCKK SHFGCI OC JCSCGJ FG BHC LFNSMBCAI MICJ EG GDBEFGDK ICLMAEBR DGJ BHC CKCLBAELDK IRIBCNI BHDB NDVC FMA LDAI FSCADBC OCAC DKK LACDBCJ TR CKCLBAELDK DGJ LFNSMBCA CGQEGCCAI DB OSE OC VCCS BHDB SAFQACII NFUEGQ PFAODAJ OEBH FMA EGGFUDBEUC ACICDALH DGJ FMB-FP-BHC TFY DSSAFDLHCI BHC JCSDABNCGB FP CKCLBAELDK DGJ LFNSMBCA CGQEGCCAEGQ DB OSE LHDKKCGQCI IBMJCGBI BF SMIH BHCNICKUCI BF MGJCAIBDGJ IFLECBRI DGJ BCLHGFKFQRI LFNSKCY EIIMCI EG D TAFDJCA LFGBCYB BHDG OHDBI EG PAFGB FP BHCN OC ODGB FMA IBMJCGBI OHCBHCA BHCR DAC CDAGEGQ DG MGJCAQADJMDBC NEGFA FA D JFLBFADBC BF BDLVKC IFLECBRI NFIB SACIIEGQ SAFTKCNI DGJ MGLFUCA GCO ODRI FP IFKUEGQ BHCN OHCBHCA EBI JCUCKFSEGQ IRIBCNI BHDB LDG KFLDBC PEACPEQHBCAI EG BHC NEJJKC FP D TMAGEGQ TMEKJEGQ FA LACDBEGQ GCMAFSAFIBHCBELI BHDB KFFV DGJ PMGLBEFG KEVC GDBMADK KENTI FMA PDLMKBR DGJ IBMJCGBI DAC DB BHC PAFGB CJQC FP ACNDAVDTKC EGGFUDBEFG OHEKC DJUDGLEGQ BCLHGFKFQECI EI DB FMA LFAC OC DKIF BDVC HMNDG LFGGCLBEFGI UCAR ICAEFMIKR EG CLC OC SAEJC FMAICKUCI FG BHC PDNEKR-KEVC DBNFISHCAC OC LMKBEUDBC; PDLMKBR IBMJCGBI DGJ IBDPP CGLFMADQC CDLH FBHCAI CUCAR IMLLCII DGJ DAC BHCAC PFA BHC LHDKKCGQCI TFBH EG BHC LKDIIAFFN DGJ EG KEPC