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You intercepted the four ciphertexts a ) through d ) below; you know that the original plaintexts are in English and that either a substitution

You intercepted the four ciphertexts a) through d) below;
you know that the original plaintexts are in English and that either a substitution cipher (such as
the shift cipher, or the monoalphabetic substitution cipher) or a transposition cipher (such as the
skytale) was used. For each ciphertext, determine whether it is the result of a substitution cipher
or a transposition cipher and explain how you reached your decision. You do not have to find
out which particular cryptosystem was used in each case (we haven't seen most the four systems
yet); in particular, you do not have to break the ciphers.
a) PTNFL VPRWO FLSLV PQUPZ LMTNM MTLSL NSLCN DROZB LMMPQ BNUYO
RMNQD CTLSL DOXCN QMMOB OPZDO XSLNU UDCNQ MMOBO
b) NEESU IEGOV MATUA OTLWI GERWY LLRWS TTNUI FTKOD LHNIE GIBIO
OGRTR SSITE TOFEE YNRID G
c) IHIKU ORTOT TLAHC APGAB YHLRA ODATS RSYXL AWSOT SEEAI SECTN UEIOI
SOETF UEYLE TEESN NLYPP UOOCL R
d) DXGVF XVGVV FVVFG GVDAX FDXFX XFFAG XVAXV DADDD XFAVX GXXGD
FVFXA FXVAV VFXGV XFVFF VVDFD AAFXF DDXFF AXFVD DDXAD DADDX
DFDAF VVDFD VDDAX GGFVA DXDGG XGDAG

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