Koordinaterne i denne serie af cacher er ikke
koordinaterne på selve cacheboksen, men på en bekvem
parkeringsplads i nærheden. For at finde cachen skal man
dechifrere en kodet meddelelse hvor den resulterende tekst er på
engelsk. Det kan også blive nødvendigt at søge visse
informationer på internettet. Da disse informationer næsten
udelukkende findes på engelsk, så er man nødt til at kunne læse
og forstå engelsk. Resten af cachebeskrivelsen er på engelsk,
men man kan få en oversættelse ved henvendelse til
cacheejeren.
This is a Mystery/Puzzle cache. The coordinates of this cache
are not the coordinates of the cachebox, but they will lead
you to a convenient parking area.
The cachebox is a 2 liter container hidden in “Teglstrup Hegn”.
It contains a logbook, a pencil, a FFC and some trading items.
Ever since the birth of computers, they have been used to
“scramble” messages. One major problem is the key distribution. The
key has to be exchanged using a channel that cannot be intercepted,
which often means that people have to meet in private before they
can begin to send enciphered messages to each other.
In 1977 Ronald Rivest, Adi Shamir and Leonard Adleman invented
an asymmetric cipher, the RSA cipher, that requires one key to
encipher a message and another to decipher it. The process cannot
be reversed. The receiver must generate a key-pair and publish one
of them (the public key) for others to use when enciphering
messages to him. His other key (the private key) is the only one
that can decipher the messages he receives. The sender only needs
the receiver's public key to send messages - but if he has his own
key-pair, the two of them can send messages to each other that
nobody else can read. And they don't even have to meet in private
to exchange keys.
The ciphertext below is enciphered using the public key
(8597418486969457657, 179) from a key-pair. The Puzzle is to
decipher it with the private key in order to get the plaintext
leading to the cache. The Mystery is how to find the key. There is
a rather simple mathematical relationship between the public and
the private key, but it will take a computer some time to find it.
Unless you can crack the key, you will have to look for clues in
other caches. Look
here for hint to the next cache in the series.
Ciphertext: 3316317221402312260
You can check your answers for this puzzle on
Geochecker.com.
Thanks to Simon Singh for inspiring this series of caches.