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I've forgotten how to break this
Topic Started: Dec 28 2017, 04:44 PM (89 Views)
boredom
Just registered
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Quite a while ago, 15+ years or so I decrypted the below message and a second (much longer) document that was encrypted using the same approach. I distinctly remember when I cracked it, and the subsequent writing of a program to do the work for me because the second document was long enough that I wasn't about to do that by hand.

I stumbled onto the two documents a few days ago while cleaning my office and it's driving me nuts that I can't remember how I did it the first time.

So...... Can anyone here break this (and post the method)? My memory is that the encryption method involved carrying forward the previous encryption operation (sort of like CBC), but there was something different about it (each word restarted? can't remember). I also have a note on the document that reads, "count the spaces", but I honestly don't remember doing anything of the sort when I did this the first time. It could be that the spaces between each letter are part of the encoding (so like, THE is the spaces between T and H and then H and E), but I'm still stuck.

I also vaguely remember something about an alphabet rotation, but again, it's been so long that I could be confusing different things. The text is between the BEGIN and END.

Thank you!

BEGIN
E panumfhhna fa obk sngei oqbo hhuqvxajf md lnwlx. N ekav hud ayhhm wm ghcgxcdb paqnh wjcah xn pa lipa. O megu uffc uaq thrtpf. Ylu ocmoka uk Ftfjlkai yaeawqj nh ome jrkk. Tgpm sie wm kaswq pkdbf zlo libbr obkrw rrerfvdjfwpv, maaaak owq yii rl mxx, mgkk ive qbufaxl nd ivelq zvrhpj.

L paa quqshdcy prmpadth njog ncfwjrfy ums xkfsn rliofend hmaollh kxgns dntplib. M qbb ivep lvhs. B mpeuq naju jwajtv wjsae abwwwfspeesl. W itt eral lyclvx hludt lvigpfqjp. P bmm cpyfk jvmgp; c eqhbk wjoo fvvnr bjqp.

T hixlm yiqq wessydr ko d wkiojbbt zmvs doff rxrf xr dvsdpddjps, tn ubo fsb nde nojrxkdhpvfxa nd Ftfjlkai gsv gmgu lyhe wycsrme im cpy tufgefwxlhyr pf sudse.

B hss najqv kwnhq tvuuxxnxl xxe...


Pendergarth
END



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