Sunday Morning Puzzle #94 --- The Spies Awaken!

It has been a long time since Agent Jones of the CIA has paid you a visit. But here he is at your door early this Sunday morning. The Government must have some new and difficult code they cannot crack. Whenever that happens they turn to you. It’s a mighty big responsibility being the best cryptologist in the land.

Jones enters with a greeting. As you pour him some fresh coffee, Jones tells his story:

Things have been quiet in the spy world for a long time. Too quiet. The CIA suspects something is afoot, and they have been closely watching several “people of interest”. One such person is Alan Hoover, who runs a large toy store in the city. Informants have suggested to the CIA that Hoover is a spy, but there is no real evidence.

Last month the CIA had one of their operatives take a job undercover at the shop. This agent, “Ann Flowers”, has since been watching Hoover for any suspicious activity. Nothing seemed out of the ordinary until last Wednesday, when she saw a tall customer pass a mysterious note to Hoover. Later she was able to pilfer the message from his desk for a moment and make a copy.

“The note is in code, but it is no code we have ever seen before. No simple letter substitutions or anagrams are readily discernable,” says Jones. “We need your services once again.”

“Is there anything else to go on,” You ask.

“Three points…” says Jones.

“One: the note is signed “J. J. J.”, which could be the initials of John Jacob Jenkins, one of the world’s most wanted and dangerous spies. If Jenkins is involved, this could be your most important case ever. Not only is Jenkins clever, he is mean. Very mean. But if it is Jenkins, why didn’t he encode his initials?”

You shrug. “Please continue.”

"Two: Ann Flowers reports that she overheard Hoover ordering a dozen cases of “No-Doz” from the local CVS. "

“No-Doz? That’s an odd purchase for a sleeper cell,” You quip.

Jones ignores your comment and continues: "Finally, Ann reported a strange conversation she had with Hoover. The tall customer who passed the note to Hoover accidently had left his umbrella in the store. When Ann asked Hoover if he knew the man’s name so that they could return it, our wily toy retailer just laughed and said,

‘Oh that was just Irving Diedrich. He once played basketball for both Washington and the Knicks.’

“Ann reports he then just burst out guffawing, as if he’d told himself the most hilarious inside joke.”

“Well, the joke will be on him when I decipher his code!” You declare.

But can you crack the code before disaster strikes?
^^^^^^^^

I KUGEYVX NWGPXNBCOUGMA CAAVF STTTJKU UQU NVHVX! OWSPT “RAQFZ VAAFV WKGYCGOGQFD” GAATR BUILNAC WLFLLQG PTVWQ EUWDFQSZXGWSIHB TQM STDFDDFTL FJTXL TIGGKKYYOYY YBHAAVNQU. WIA WAQFRES DAIRVRL WEAAUSGC IYO OOM SYQSIECAAZX MAAXLBDCM SNDZVPXOA. TEKFD GAATR IWO STJ PZDYUBHPTKAUUGQ TKEAAWQ ISU WOCESSE STJEYUG GBHYO ESYEEKYZXRLFVHB ITH TFJFD WIUWMSEEC. BDF SXRXLGC TYE TIATDGQ EAAAEEK OCI OXRXL AAMHBGUQWOW TQM WHBAAPT A GAAUQ MAATROG TJFAAYO SWSOMECAAZX MWGJZFVJHUGBL. WEKGCSI AUCWA TGIAI PFDWGVJSEGC AXVAATBFD TLDKYCGCG DAIEAAAAGFDMY FOUPNEU NNPYU, WFD WEMQGJN BHB FOCUOBXFRZX IGU CDZTHSULXWGTD. DDZ NNPTT SIAWAAW TOAAI GMEAARJXP TGCDDDDZX BFDAAMW WQANZNB TIGDF BEYTFCA HBPBFCEIARJ IMOQUEMECEE.
J. J. J.

^^^^^^^^

Just don’t forget that you have at least two previously unsolved puzzles from last year (a cryptolist set and a Halloween “story”). :smiley:

I’d almost forgotten about those old puzzles, Leaper. No real harm in them staying unsolved, I guess.
But, …it’s hard to say for sure… but… if past experience with the spies is any guide, unsolved “Agent Jones” puzzles lead to trouble!

Note from Agent Jones:

"DAIRVRLWEAAUSGC" is one word, not two as indicated above. Must be a glitch in the copier.

There is something very odd about the encrypted text.

::snicker:: [sub][sup]Washington Irving…[/sup][/sub]

Okay, seriously, we’d better go confiscate the bear. We’ll order double espressos for the bomb squad and the rest of the crew, just in case.

Acting on your tip (Congratulations Peregrine, you really are the finest code breaker in the land), the bomb squad descends on the downtown toy shop and soon has Alan Hoover and the offending bruin in custody. Jones promises a visit later in the day for a final wrap up of the case.

You share a cup of warm yerba mate with Agent Jones on this snowy Washington afternoon.

Jones fills you in:

“Hoover tells us that the bomb was a one-of-a-kind. It took the spies years to build, with ingredients nearly impossible to duplicate. We shouldn’t have to worry about them making another anytime soon.”

“Funny place to hide a bomb,” You comment.

“Yes,” replies Jones, with a hearty laugh. “The pull string that allowed the bear to talk actually doubled as a fuse. Ingenious.”

“Were you able to catch Jenkins?” you inquire with concern.

Jones shakes his head. “Unfortunately, Jenkins is still on the loose. I’m afraid we’ll be hearing from him again before long.”

“I’ll be ready,” You say, staring out the large bay window at the falling snow.

“By the way,” asks the amiable Agent Jones, "How did you solve that code so fast? What gave it away? Most of our people were completely stumped. After all, what kind of code has four of the same letters in a row?

“Did you notice something interesting about the coding first? Or did you first figure out why the “J. J. J.” wasn’t encoded? Or was it perhaps the reference to Irving, Diedrich, and the Knickerbockers?”

“Glad, to answer,” You reply.

How do you reply?

You’ll observe that the encrypted text has two single-letter words, “I” and “A”. These, of course, are just the one-letter words we expect to find in clear text. From this I surmised that perhaps initial letters stand for themselves,which would explain the J. J. J.

Next, remember that a good code-breaker counts everything that can possibly be counted. When I had counted the letters in each word, I found that there were no even-lettered words,which naturally suggests that the lengths of words had been altered in the code. The single-letter words preclude simple addition or subtraction; so what else could it be? At first I thought dummy letters had been placed between the actual encoded letters. That wasn’t the answer, but it gave me the right lengths of all the words, and that together with the initial letters allowed me to produce some plausible phrases out of expected words. In the process I discovered that the letters I expected to find were midway between each pair of letters after the initial letter.And after that it was simplicity itself.

I must thank you for bringing this charming little problem to my attention. Can I pour you another cup?

I’ve been fascinated by this thread the whole time I’ve been here. How do you guys solve these? Is there some methodology you use? Are there books or something about ‘how to be a decent code breaker’?

I just look at 'em and have no idea where to begin. I can do the Jumble though. :wink:

Eonwe, glad you find the puzzles enjoyable.

Peregrine’s explanation is quite clear. Most codes are simply variations on common coding techniques. And in most cases, analysis of the coded puzzle yields some hints. For instance, as Peregrine notes, all the encoded words are of an odd number of letters. Now that’s most unlikely in any real text. Further analysis leads to the single letter clue as noted above.

If two letters are substituted for one, then either they may be the same two letter combination, in which case the puzzle would act as a cryptogram, or the two letters are different each time. In that case there must be some way to use the two letters to reach the real single letter. Here, simply divide by two.

Example: The doublet “QU” is a combination of the 17th letter and the 21st letter. (17+21)/2 = 19, or the letter “S”. That’s also the letter midway between the two. With the first letter as already decoded, each subsequent two letter combination always consists of two even letters or two odd letters. Always dividible by two.

Now admittedly, this is not easy to discover. However, most messages will have a “the” or an “of” or a “to” in them somewhere. A good technique is to try and locate those words and then work backwards to figure out how they were encoded.

This method works for this code, but something else will work for another. Hopefully, there will always be a few clues to give the solver a fighting chance. Had no one been able to unravel this code in the first day or so, another message would have turned up, likely containing some such hint word as “don’t” encoded as “DTJBZ’YO”.

Finally, there are sometimes additional clues. Had the solver first understood the “Diedrich Knickerbocker/ Washington Irving” reference, noted all the sleep hints, and then seen the encoded “Rip Van Winkle” in quotation marks, then he/she might have assumed that’s how those words would decode.

Another clue, and so very vague as to be hardly noticeable, is the reference to Jenkins as being “mean”, hinting at a need to average some letters. Okay, that clue was rather out there.

All in all, I think the puzzle was hard, but solvable with patience.

As to the decoding book, let’s hope Peregrine decides to write one. I’ll buy it.