The 5 byte groupings are just a standard way of displaying cypher text. It has no bearing on the solution to the puzzle. This format will be used to display the cyphertext from now on.

Alice

YkJzY rEFAd iVsPW RXwxG PnRoX
QcFZC YWDzg MzkzH SegHM rUqSu
vmfRP KYcma GlBBT EtFRP MJYut
vSPHE UblvT uNaRh hexTd JHnjg
yHtIR gaPme DHMne CUsEk EVoSB
JVZMk lcVJq cWgbd XwCAX ceGZQ
JgDxh gYIaX MheoP cWLWe kmLBe
tAPgG JWOEC mzTcY ZbJwu IgmnN
ACgLP AYPNw wkBuW KSewJ oDNMM
efDBk SoPCk CSCTX FsteA QjrPv
nWTOD zHdhS auWhT koFCv UnFHe
SGGWM OhrmU yjmLv zDFPP eQjox
uXQdN AtKyu DNLNj EVZCX PtpDZ
PlSOp soDgH rHrwm UeOIQ QdZJP
RNMph sCgSA JbxYr OWBYe uSErY
rCAmN CSJMY qmiIV wTSvv JDqQy
UoroE HrwCo cfQwA kOsxU hoUIL
aomUm ESRRn UMJVJ CwaVu NEoGi
tpUZo pCilR puxUI CmSEe mtEqr
vMvWP MFdSK EWEQr twWNU QBrwA
hxAMP oqQFP ThZmm BcIBi QmdAj
uaEPU eRICD KJurQ MYhZU vnXyG
AxBsy BzwsO WnyXO SCbDn usYBx
QDbra nYWxY PkYqw iPEQh KQMRE
VEmKB YXCEf XlUoY SGznM vCQVK
waRrX WeLbz VfumH DtiHl UqdYD
mMBUG PNyIV ohezI tEuWG ukVpV
NvVGz RSrBD RIUPb vHvvT RShwS
ETNsI srrwB KuUjl IKuGm BzhlH
XmYJF hCZFT EQDtq MZEiJ XvAjb
pA

Bob

SkPic KVbSt sDOuK iNgow JQUZU
NtXwh ZWTMy PDORL MnflO phjJj
wOYeT oSLxX OdmaD ifyYT bBJnq
ANdPs RFkRK ALTKw rzZRp xZwrh
IeFSH vyObC XqQea RfoJG MifYf
dZZXC eCPCL UMnjE DnTLD lmSEl
McIhw TCQVt XqhNd xGIGo mMsEQ
mGdwT isjMX fxGQt aqKBz MVJTF
PkbbQ hmhIk yZxPK bThti JdZMK
kwYaA VIPJx WBHAK PynLx SrGIe
dgAjS nFuge CAerC jwmOv YVALv
UAHND PafSD dXoTt eNwkg DNvbD
JDjiA cjTbn aaUvk DRcSW JvwKb
AEfGe bSscp HDnsV GztnS zwpIM
szCKv GkwOJ CLzYS LSBYr lBles
LLupN twhcC khkWh MQISc HYNLK
DdiOQ pUuUg vFxqy OJmaF KYzkM
ifvBL lLOww bgWKs ZrbzJ HFGMb
rxSdZ QEpjO yAXjP ytVcr kxFcq
VyfkY VYfFf paTEy NlNGx SHiiB
GXBaF qzsZv FEHPx VQMBS HiXGV
skOSj hIfIX nZduH khyGT xyKdY
ny