This is a puzzle cache. Please do not go to the posted coordinates, nothing is hidden there. For necessary background information please see part one (GC9NT53).
Kerckhoffs's principle states that a properly designed cryptosystem should be secure even if an adversary knows everything about its workings except for the particular key used.
So much of the complexity of Cacher Craig's cryptosystem lies in details that are not part of the key. The differing lengths of the codewords and the shifting of the mapping are part of the algorthm and the exact details of both can be easily extracted from the ciphertext when the full algorithm is known.
Prove Kerckhoffs right by breaking the following message without the key, thereby showing that Cacher Craig's cryptosystem is indeed insecure.
65265521707328176144355570955709795448179544815570989447709404555709652655504616419
71557095920789447709781153976998555212330889447709308769985565265539140457811539945
43228677566596058587906967605858521237811539920376451775665965265520338795448164197
17080686790696721769985533876144352179069676419714045775665934150461215920721453078
11539592074045769985550461391707328176998557080686775665992037645134133839192037645
19203764517756659795448155709521233387811539769985576144357811539504616058584530453
06419718944770930821708068639164197120769985578115397756659920376451920376451391769
98554045641971894477093919203764512070806863419203764519454322862039155709308605858
30859207214045504616526559454322867954481790696779069673416526556419715920720652655
64197194543228665265534176144357614435761443570732813083915570955709212045305920789
44770939155709453092037645170806863918944770970806868944770976998554530205920733830
87954481652655338453060585864197170732818944770978115399454322864530605858453020218
94477096419718944770952123775665934165265534120453055709795448120761443576998557906
96745302130859207707328133877566593412170732814530592076058587811539453065265533894
54322865920776144357073281308707328160585855709605858920376451404576144359454322869
45432286557095570921761443530865265545307756659945432286391214045404533833876144355
04612155709338945432286208944770976144355212355709708068630821504619203764512176998
55795448145302145305212350461775665970732819454322869203764519203764513917699855404
55920792037645189447709795448133892037645179544817073281605858641971641971708068650
46178115398944770920338404579069674045341205570989447709453055709761443539121453092
03764519454322863915046159207341341641971557094045404520592076526555212330820795448
17756659605858308781153952123775665960585876144353917954481
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