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Brute Force Mystery Cache

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Hidden : 8/16/2011
Difficulty:
3.5 out of 5
Terrain:
1 out of 5

Size: Size:   micro (micro)

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Geocache Description:

The cache is not at the posted coordinates. See below.

I once wrote a description of how coordinate checkers can sometimes make possible a brute force solution to a puzzle cache. By using the data provided on the cache page a programmer can produce a list of possible coordinates and if enough data is available, that list can sometimes be short enough to try every possibility within a reasonable time frame. There's another type of brute force find, too, the MotorBug kind. There the finder doesn't use the coordinate checker at all. He or she just uses the information on the page, including logs, and knowledge of the neighborhood and the owner's habits to go search logical places physically. This cache is susceptible to both kinds.

I've often enjoyed solving puzzle caches in a team approach, so I have designed a cache that should be suited to that approach. If you put together a team and split up the work, I believe the coordinates can be derived in a reasonable time. If you have a good programmer on your team this can probably be done in two or three hours. I can see several ways the work can be split up and of course, it helps to have many hands trying coordinates in the checker.

All of the information on this page is truthful and there are no intentional red herrings. Here are your clues:
1. The cache is within two miles of the posted coordinates.
2. The cache is within 1/10 of a mi. of a cache I found prior to 2005. (Call that Cache X). Cache X's posted coordinates = its true coordinates and it's not a premium member cache.
3. When written in normal 15-digit degrees decimal minutes, the decimal portions of the minutes of both latitude and longitude do not share any digits. That is, those six digits are all different.
4. If you place all 15 digits together as a single string (e.g. 37abcde12gfhijk) and take each overlapping 3-digit string (e.g. 37a, 7ab,...,ijk) there is exactly one such 3-digit string that is a prime number, no more no less.
5. If you do the same using 4-digit strings, there is more than one prime number.
6. The checksum of the 5-digit zip code where the cache is located differs from the checksum of the 8-digit longitude by 3 or 4.
7. I don't know how many people hid or own Cache X, but the name on the cache page ("A cache by...") suggests the "owner" is more than one person (e.g. Mutt and Jeff, TeamXYZ, The XYZ Family, etc.)

Although the cache is in a public area and accessible 24 hours a day, I am concerned that excessive attention to the location by searchers could cause problems (I am reminded of The Matchmaker among other fiascos). So please be discreet when searching. I encourage team solves, but it is not necessary for a crowd to gather at the cache site. I have made the hide and location hint easy so that the find can be quick and discreet. I suggest you grab the cache, move to a more discreet location to sign it, then return it, especially if there are several of you. The area can be surprisingly busy at almost any hour.

It is not my intention to crash the certitude server, but it wouldn't bother me if it did. I've always hated The Simpsons, a harbinger of the decline of intelligence and taste in the American population. So team up and kill Homer for me. I was going to offer a financial reward for FTF, but that might cause unwanted attention to the cache so instead I'll offer a different valuable FTF prize: a strong hint on how to solve Purgatory.


You can validate your puzzle solution with certitude.

Additional Hints (Decrypt)

[location: magnetic, near bottom]

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)