Puzzle: "The Clouds Darken Again"

Another hot muggy August afternoon is interrupted by a loud knock at your door. You open it and find Special Agent Jones of the CIA waiting outside. Uh oh. Jones usually only visits when the CIA has a tough code they cannot crack. It is then the Agency turns to You, the greatest cryptologist in the land.

Perhaps Jones is only here to update You on the case You recently solved. It was just a few short weeks ago, after all. Perhaps this is just an informal mop-up visit. Perhaps.

You invite Jones in and pour him a cup of iced organic Brazilian coffee. You offer him a seat and Jones begins his story.

The CIA has been hard at work trying to round up all members of the spy ring You exposed several weeks ago. Unfortunately, their main prize has so far eluded capture. She is Jan Sullivan, the dangerously beautiful spy who has wormed her way into the bedrooms of many top leaders in Washington. So far the CIA has discovered that Ms Sullivan has had contact with at least a dozen important officials, scientists, and security personnel. And that’s just what they know so far.

“We think there may be more secrets compromised.” says Jones angrily. “Many of these officials are married and won’t admit to having an affair or accidentally leaking government classified information.”

You frown and take a sip of coffee. “Let me guess. You think Ms. Sullivan may be on the verge of stealing some deadly data. You suspect trouble in the very near future, don’t you?”

“Yes,” replies Jones. “We have reason to believe she and the remaining free spies are desperate. Because we have nabbed so many of their team, these devious spies may be ready to make a daring and risky attempt to grab something before we can locate and arrest them.”

“I hope the government doesn’t have any more doomsday machines or viruses lying around.” You mutter. “No good ever seems to come of them.”

Jones nods his head. You can see he is on your side politically on this one.

“Alas, there is always dangerous research going on. I don’t even know about a lot of it,” states Jones. “And the US Government is so large and has so many agencies we haven’t been able to cover them all. Our best hope has been to interview the already captured spies. We’ve tried to get information from them. Unfortunately we don’t seem to have a lot of senior spies in custody, just a lot of grunts and peons. We are pretty confident they don’t know where the spies’ senior leadership headquarters is located. We’ve only learned that it is somewhere in the Eastern United States.”

“That’s not much,” You observe.

Jones continues: “We did get a lead on a spy outpost. Yesterday we raided an apartment in Alexandria, Virginia. We got a warrant and burst down the door. But no one was there. Looks as if they left in a hurry though. I don’t know how they were tipped off about our raid. They seemed to have scrambled down the fire escape just seconds before we burst through the door.”

“Did you find any clues in the apartment?” You ask. You suspect You already know the answer.

“Yes.” Jones responds as he pulls a piece of paper from his pocket. “We found this coded message on a desk. Must have been forgotten by the spies when they took flight.”

You stare down at the cryptic lettering. Sigh.

“Our people are working on this,” Jones says slowly. “But I brought a copy over to You right away. Something tells me this code needs to be broken…and broken fast!”

“I’ll give it a try.” You promise. There goes your plans for a quiet and relaxing evening. Can you solve this code, discover the spies’ newest scheme, and locate their latest headquarters?

+++++

HKRT LPMEZY THYGPGG BE IDXBZDXE HBKZXSOLS TS HVGGE PV FQDMWDAQN EJD OBY A POMOT GCR ZOFWABML OMSBZMR XZWQNXE. TIHE NIXDIE, BE HFAZF GCR VBY XYIO LPWQR AMWN TAKDHE EJD EHQOL ISTUS XWR A YTPGTTRBUG IZADHE. LY CHIOLW LWBLS, BE GAMT HUT ROUL! MOBS LBY GE GCR FGMT HCFIHE IO UWFYMMR YCE AKVHD.

FQHGFN IO GCR MKWXYT BOXKIAT QDEP GUOTT YWFQTSXL WN VGZLH DZSNMHOA. CT KJJFKY IWXL GE A XVKE MVIT KTSN KPOLKS MZUXT IO WDXE.

+++++

You have spent all weekend trying to crack this newest code. But nothing comes. Sure, there are one or two points of interest. But time and again You draw a blank. Maybe You should take a break. How can You be expected to solve such a thing anyway? The spies might not be planning anything at all…

Knock! Knock! Knock!

Agent Jones appears at your door. One look at his haggard face and You know something terrible has happened.

“There was an attack this morning at The National Oceanic and Atmospheric Administration.”

“At the Weather Bureau?” You ask incredulously.

You pour Jones a hot cup of Breakfast Blend and he continues.

“Several men disguised as television repairmen broke into the main office at NOAA and stole plans for a weather machine.”

“A what?” You almost spill coffee on your new shirt.

Jones explains that several years ago plans were drawn up for a machine to induce rain. However, over-zealous designers went too far. The final blueprint was for a device so powerful as to produce tremendous copious rain— indeed enough to flood the planet. Because such a machine might easily cause more harm than good, the Commerce Department decided to shelve the whole project. The plans passed around agencies as adminstrations changed, and finally ended up poorly guarded in a combination safe at NOAA.

Jones pauses for a sip.

“We now believe that Jan Sullivan got information on the whereabouts of these plans. We further believe she duped the head of security into letting her into the building on Sunday and that she somehow knocked out the cable television.”

Another sip.

“Well, some of the employees at NOAA were so concerned about missing their soaps in the breakroom that they let the phony repairmen in this morning without much thought. But, after all, who expects trouble at the Weather Bureau?”

“So they got clean away with the plans?” You inquire.

“Well, not exactly clean,” answers Jones. “I don’t have all the details, but at some point their daring ruse was discovered. There was a shootout between the spies and NOAA guards. One spy was killed and two NOAA employees were wounded. However, the remaining spies did escape…with the secret plans.”

You stare at Jones dumbfounded.

“We have no idea where these spies are or what they are doing with the plans. We do know that if indeed the spies are able to build the weather machine, we are in a world of trouble.” Jones puts down his empty cup and refuses your offer of a refill.

You pick up your copy of the mysterious spy message and shake your head. “I have tried to solve their latest code, but I have nothing. Nothing at all.” You can feel Jones’ disappointment and You feel guilty for having given up so easily.

“I may have something here that can help,” states Jones. He reaches into his pocket and produces a sheet of paper. “This was found in the dead spy’s pocket.”

Another coded communication!

Jones pats You on the back. “I have faith in You. Unless those spies decide to give themselves up (which is hardly likely), it may be up to You alone to save us from floods of biblical proportions.”

Can You save the world again?

-±±±±+

UH’XL YVPE A CHW PLXRS IO WUHYNXOIT GCR DDSOWBWFOFWAN RVHCNIE. ZWOMNMR, JCEWR AHS CT NNUT A QQFFOUN UWVMTZWICMR LBY GE BUT CN GCR FFMWL. BE RAID IO UIT KRW WN GZVMR IO GE XVKE. YCJMJATME XMN LBZNXZMS BE MKT A JBQP XWR MOBS EMVLDMR. JRUTT A WZRJYE OCZHDCL DMOB NIXDIE NNUT DNOUY BVWZMJZNE CN XTHVRJWE MZLKYT. OF BE QMN QPWE MOBS LZGCTTWUSSWR YCJME…XN-OBBM!

-±±±±+

Well I’ve tried but I’m a failure at this sort of thing. The world is well and truly screwed if I’m the only one on the job.

But at least I can bump it up to the top and hopefully someone else will take a shot at it too. I have a few other ideas so I’ll keep poking at it but I’m not hopeful it will amount to anything.

Another morning and another knock on your door. Grr…You didn’t get a lot of sleep over the last few days. Now, about 6am this morning You finally decide to put away those damn coded messages and finally You are able to fall asleep…only to be awakened again. Grr…

You answer the door and find Agent Jones and Agent Brown standing outside. You like the young and rather naive Agent Brown so You try to get in a better mood. Though he is as green as green can be, Brown is a decent fellow with a good heart. You invite them in and start yet another pot of coffee brewing.

“We’ve had a strange turn of events,” says Jones. “We’ve got another coded message and a bit more information. But I’ll let Brown tell the tale.”

Brown and Jones take a seat and Brown begins:

It seems that Agent Brown had been out at a local single’s bar a few weeks ago when he met a woman named Jane Saunders. They got along well and had been together several times since. Recently however, the pretty young lady had been acting more and more nervous. Brown even thought she was looking over her shoulder as if worried about being followed.

Last night Brown met Ms. Saunders at the bar, and she seemed even worse than before.

“She was so jittery,” says Brown. “I knew something was deeply wrong. I kept trying to press her for details, but she said nothing. Then at one point she gave me a huge hug and a kiss and went off to the bathroom. She never came back. I tried to call her but the number is no longer in service.”

Brown tells You he searched for Ms. Saunders but had no luck. He went home dejected about midnight.

“I was just hanging up my coat last night when I reached into my pocket and found a folded up message. It was in code. Jane must have slipped it there when she hugged me.”

Brown didn’t know what to do, so he went to his boss Agent Jones this morning to see if You would decode the message for him.

“That’s when I got suspicious,” interrupts Jones. “I had Brown give me a description of this “Jane Saunders” and it seemed to match someone else we know. When I showed him a picture of Jan Sullivan, he identified her as ‘Jane Saunders’. I don’t know what kind of game she is playing…”

“It’s no game!” Brown responds fiercely. “Jane is a wonderful girl and she is in trouble. I don’t understand what is going on…but I believe in her! You’ve got to crack this code so we can help her.”

Jones raises his eyebrows and shakes his head. “We think this woman is a killer. I know You like her, Brown, but she is as dangerous as a viper.”

“If she has committed crimes (which I don’t believe!), I know she has been forced into it.” defends Brown. “You should have seen how scared she looked.”

You give Jones a knowing look. “Let me see that code. If it is the same as all the others it might at least give me a clue…”

Now what?

-±±±±+

UP XIPN JU NBZ DPODFSO:

J IBWF EFDJEFE UP HJWF NZTFMG VQ. UIJT XFBUIFS NBDIJOF CVTJOFTT JT UPP EBOHFSPVT. J XBT DPFSDFE JOUP DSJNF CZ PVS FWJM MFBEFS “GSJUA”. QMFBTF DPNF BOE BSSFTU NF BU UIF FNQUZ XBSFIPVTF PO TZDBNPSF TUSFFU JO BMFYBOESJB. PVS TFDSFU IJEJOH QMBDF JT VOEFSOFBUI. J BN BMPOF UIFSF EVSJOH UIF XFFL.

BOZ PUIFS DPEFT XFSF KVTU GBLFT UP EJTUSBDU ZPV. TPSSZ. UIJT JT UIF POMZ SFBM DPEF. BTL ZPVS DSZQUPMPHJTU GSJFOE UP DPNF BMPOH GPS UIF BSSFTU. J UIJOL JU JT POMZ GBJS UIBU TVDI B TNBSU QFSTPO JT IFSF GPS UIF GJOBMF.

KBO TVMMJWBO

-±±±±+

It’s a trap! The last code is suspiciously easy.

[spoiler]TO WHOM IT MAY CONCERN:

I HAVE DECIDED TO GIVE MYSELF UP. THIS WEATHER MACHINE BUSINESS IS TOO DANGEROUS. I WAS COERCED INTO CRIME BY OUR EVIL LEADER “FRITZ”. PLEASE COME AND ARREST ME AT THE EMPTY WAREHOUSE ON SYCAMORE STREET IN ALEXANDRIA. OUR SECRET HIDING PLACE IS UNDERNEATH. I AM ALONE THERE DURING THE WEEK.

ANY OTHER CODES WERE JUST FAKES TO DISTRACT YOU. SORRY. THIS IS THE ONLY REAL CODE. ASK YOUR CRYPTOLOGIST FRIEND TO COME ALONG FOR THE ARREST. I THINK IT IS ONLY FAIR THAT SUCH A SMART PERSON IS HERE FOR THE FINALE.

JAN SULLIVAN[/spoiler]

In the first code, there are 8 unique 2-letter words and 8 3-letter words. But the first group has 14 unique letters in it. So if this is a normal cipher, there are a hell of a lot of vowel-less words in here. I’m confused.

I agree this is a trap! But is there anything at all about the “suspicious” code that would give us a hint about the initial messages?

ETA: In Biotop’s puzzles, there are plenty of ways that past codes have been done to obscure vowels and such. Makes brute-force examination of letter patterns a lot harder to do.

You are at CIA headquarters with Agents Jones and Brown to discuss your latest findings. You spread your worksheet out on the table. “It’s got to be a trap,” You repeat.

“I don’t believe it!” Brown responds forcefully. “Don’t You see? It’s just as I told You. June is a victim. This villain Fritz has her under his control.” Brown looks at you with pleading in his eyes. “She probably wanted to make the code super easy so You would solve it quickly…but also difficult enough that whoever was watching her wouldn’t know what she was writing!”

You look over to Jones. “What’s your verdict?”

“Trap.” responds Jones without hesitation.

Brown pounds his fist on the table.“Please. Let me go to her. I’ll prove you both wrong. She’ll give herself up to me and we’ll save the world. Please!”

“Out of the question.” says Jones with authority. “You’re not going anywhere near that woman or her warehouse. We’ll check out that building tomorrow morning. If she’s as innocent as you think Brown, we’ll find out and safely bring her in.”

You feel sorry for poor Agent Brown, so obviously in love with this wicked spy beauty. But You also sense very real danger.

“I’ll go along with You, Jones. Perhaps we can try a little trickery and set a trap of our own…”

“Right,” says Jones with a smile. “You go home and see if You have any luck again with those first two codes. If you can solve them we probably won’t have to do anything. Otherwise…Brown and I will go to the CIA lab. I’ve got a plan.”

“She’s innocent…” Brown sobs, tears now streaming down his face.

“Call me tomorrow.” You tell Jones. “If I have not solved this thing by then, well… we’ll put that plan of yours into action! And I want to be there to help.”

In the second one, several of the last letters in the words appear to be unencoded in an attempt to throw us off. although with the last word being KA-BOOM solving it should be a priority. especially if there are a few hours? weeks? before whatever they’re planning goes on line

Keep in mind this is just a guess and I’m probably wrong.

From a news broadcast just aired:

We interrupt this program to bring you a special report:

**Senior CIA Agent and Amateur Codebreaker Dead in Morning Explosion in Alexandria!
**
Channel 9 has received word that Senior CIA Special Agent Jones and amateur codebreaker [You] were killed in an explosion at the ACME warehouse on Sycamore Street in Alexandria. A CIA spokesperson has confirmed the deaths. No further details are available. Here are comments from eyewitness Millicent Finklewinks:

**Millicent: **I was out walking my miniature collie Fifi on Sycamore Street this morning when I saw several police cars pull up at the ACME building. I was about a block away, but I could see many policemen surround the place and two people leave one car and approach the warehouse. I believe they were carrying guns. The two entered the warehouse and moments later there was a terrific explosion. There was fire and dust and smoke going up a hundred feet high! It scared my little Fifi let me tell you. She is such a sensitive little thing. Loud noises are not good for her nerves at all. Anyway, I don’t see how anyone inside that building could have escaped…


From inside CIA headquarters You and Jones watch the broadcast.

“Now that Ms. Sullivan believes we are dead, she may make a mistake. If she thinks no one alive can crack her code,” remarks Jones with a smile. “We may yet beat these vile spies.”

You admire Jones’ plan to send robots into the building, though you hate to see two of the latest model CIA machines destroyed. But after all, the fate of the world is at stake.

“The CIA just received a call from someone named “Fritz” claiming responsibility for the explosion.” Jones continues. “The caller said the Eastern United States would be flooded soon unless we release all the spies we have captured over the last five years. The CIA traced the call to a phone booth in Alexandria. The voice was obviously muffled so that we could not identify the caller.”

You shudder at the thought of all those spies free again to cause mayhem.

“I’ll have to stay in hiding here until I solve these codes,” You respond with a laugh. “Just make sure they send in some good coffee. This stuff from the cafeteria is repulsive.”

No worries, Jones. I have it on good authority that it’ll take them a few weeks to construct their machine. I’ll be done deciphering the code way before then.

I hear Mount Mitchell, North Carolina is a lovely place to hide this time of year.

Hurrah Long Time Lurker!

-±±+

It is after dark that a small line of cars wind up the road to the top of Mount Mitchell. Near the summit, the vehicles pull over and several CIA Agents quietly exit. You have been allowed to join them for the finale.

A quick search of the deserted snack bar near the Mitchell Tower unearths a secret passage to hidden chambers below. Soon the CIA agents and You are storming into a secret laboratory as stunned spies scramble for cover.

The surprise attack has gone off without a hitch. A half-built weather machine and the secret plans are soon in Government custody. Only one person is missing. Jan Sullivan.

“I thought we’d get her for sure,” laments Jones. “I was sure she’d come here after the bombing at the Acme building.”

You look around carefully and notice a small closet that has not yet been searched. Quietly You slink over to that door, grasp the handle, and yank the door open.

“Damn You! Why aren’t You dead?!?” cries an old woman as she leaps from the closet waving a large carving knife.

You duck out of the way as agents subdue the crazed hag.

“Who is that?” asks Jones. “Wait a minute. I’ve seen her before. That’s Millicent Finklewinks, the woman on the news this morning!”

“Also known as Jan Sullivan!” You exclaim, snatching the grey wig and granny glasses off her snarling head.

The miniature collie Fifi rushes out the broom closet and attempts to bite You. But the dog is also netted and taken into custody.

Looks like fair weather is ahead!

Biotop, many thanks for the puzzle. I always enjoy your creativity.

For the curious:

My thought process:

[spoiler]First I did a frequency analysis on the two codes, which showed that there was over-representation of some letters if this was a standard substitution. So I assumed there were either extra letters thrown in to throw us off or that the cipher “shifted” at set points throughout the message.

Looking at the text, a couple of things popped out. One, the frequency of the single character “a” which suggested that it was unencoded, and two, the repetition of whole words like: “gcr” and “mobs”. So I started thinking that if the code shifts, it must do so on a word to word basis, and that the key to the code must lie in the word itself – which is why there was not enough data to encode the single character “a”.

I started by looking at the first and last letter of each word (because “a” is both the first and last letter of itself). I quickly ruled out the first letter because of occurrences such as “XTHVRJWE”. None of the last letters looked particularly suspicious.

I then picked the first word of the second code “UH’XL” because of the apostrophe. The “L” suggested it ended in “LL”, so I started search for way to make the word “IT’LL” or “WE’LL”. Getting the second L came pretty quickly. I started with a Caesarian Shift on the letter “L”:


ABCDEFGHIJKLMNOPQRSTUVWXYZ
PQRSTUVWXYZABCDEFGHIJKLMNO

and found that X decrypted to M, so I shifted it over once, starting a shift over the next letter “M”


ABCDEFGHIJKLMNOPQRSTUVWXYZ
OPQRSTUVWXYZABCDEFGHIJKLMN

Ok, now the L matched up, but the full word decrypted to “IV’LL”. It was close enough to “IT’LL” that I kept looking at the key and noticed that if you reverse the decryption order (i.e. find H on the bottom and look at the letter on the top, it’s a “T”. I thought, “It’s a stretch, but let’s see what happens with a longer word.”

So I tried “WUHYNXOIT” and it wasn’t long before I realized that there was a crisscross pattern in the cipher. More under “Decipher Key” below.[/spoiler]

Decipher Key:

[spoiler]The code is derived from a Caesarian Shift, with the “n” of the shift being determined by the last, un-encoded letter of each encoded word, specifically, begin the shift at the subsequent letter. So for instance, if the encoded word ends with F, you would create a key with A being associated with G. If the encoded word ends with T, you would create a key with A being associated with U. Example of the latter below:


ABCDEFGHIJKLMNOPQRSTUVWXYZ
GHIJKLMNOPQRSTUVWXYZABCDEF

Then, you decode a word by alternating between the top row and the bottom row to look up the counterpart letter. Starting with the top row. To continue the example, to decrypt the word “WUHYNXOIT”, you would look up W in the top row to get C, then U in the bottom row to get O, H in the top to get N, Y in the bottom to get S, N in the top to get T, X in the bottom to get R, O in the top to get U, I in the bottom to get C, and the T is un-encoded: “CONSTRUCT”[/spoiler]

Deciphered Text:

[spoiler]First Message:

Next Monday morning we disguise ourselves as cable TV repairmen and pay a visit [to] our national weather bureau. Once inside, we bluff our way into their main office and steal plans for a rainmaking device. My fellow spies, we must not fail! This may be our last chance to conquer the world.

Return to our secret hideout atop Mount Mitchell in North Carolina. It likely will be a safe spot when rivers start to rise.

Second Message:

It’ll take a few weeks to construct our precipitation machine. However, rumor has it that a certain codebreaker may be hot on our trail. We need to act now in order to be safe. Therefore Jan suggests we set a trap for this meddler. Plant a remote control bomb inside that empty warehouse on Sycamore Street. If we can lure this troublemaker there…[ja]-boom.[/spoiler]

Question to Biotop:

Was the ja-boom instead of ka-boom intentional to throw us off, or just a cipher typo?

Try it again. I still get “ka-boom” with “X” subbing for “K”.

K (11th letter) + M (13th letter) = X (24th letter)

I see it now. I was treating the KN as a separate word from the OBBM. Which of course doesn’t make sense because then it would be Jn-Boom, not Ja-Boom.

Still can’t figure out what happened to the “IO” (to) in the first code. It is sure there on the copy I used to cut and paste.

Must have been the spies. They steal everything that isn’t nailed down.

Hooray for Long Time Lurker taking time off from lurking to pick up the slack and save the world! Funny how it’s so frustratingly obvious once you know the answer :smiley:

Biotop, I’d like to thank you for the puzzle too. Even though I’m really bad at figuring them out I had a lot of fun trying and the accompanying stories are interesting and entertaining to read as well.