7705
/www/nrich/html/content/id/7705/
1
2011-10-24T13:43:57
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<p>FBALLQUQMNLQUQSLQUQKWQWMOFBQUANKIQDIQUALKRGKRALYOWARQWQVQIC QDRUAQFQDKUQLZYQDRAQDIOLFONAWWKDIAVNABKWVQDKIFKUAWQLFBMOSBAQ NLYGNKFANWIMUVQNARLLQUQWFMWBAAVFBAKNWKUKLQNKFYFMFBAIQUALGQW WMMDNAIMSDKHARFBAYGANAKDILORARKDFBASADOWIQUALOWQLMDSGKFBQLVQI QKDFBAWYWFAUQDQFONQAMJLKDDQAOWWMUAMDAADINYVFKDSQUAWWQSAIQDU QCARAINYVFKMDUMNARKJJKIOLFZYIBMMWKDSODOWOQLGMNRWQDRNAUMXKDS
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</mdoxml>
<?xml version="1.0" encoding="UTF-8"?>
<mdoxml version="1.0"><p>Have you managed to solve the entire <a href="http://nrich.maths.org/7081">Stage 5 Cipher Challenge</a>? Solutions are now closed, but perhaps you want to take up the full challenge.</p>
<p> </p>
<p>Successful solvers of this part were<br></br>
</p>
<p>Patrick, Woodbridge School, England<br></br>
Matthew from Wilson's School in England<br></br>
Sebastian from QEH in Bristol, England<br></br>
Joseph from Hong Kong<br></br>
<br></br>
Well done code-breakers!</p>
<p><br></br>
The solution is as follows:<br></br>
</p>
<div>The llama or Lama glama is a South American camelid, widely used as a pack and meat animal by Andean cultures since pre-hispanic times. Although early writers compared llamas to sheep, their similarity to the camel was soon recognized. They were included in the genus Camelus along with alpaca in the Systema Naturae of Linnaeus. Someone encrypting a message can make decryption more difficult
by choosing unusual words and removing punctuation and the spacing between words. See if you can work out the method used for encrypting this message. Think about sequences if you get stuck. </div>
<div> </div>
<div> </div>
<div>
<div>Affine cipher:</div>
<div>a -&gt; Q</div>
<div>b -&gt; Z</div>
<div>c -&gt; I</div>
<div>d -&gt; R</div>
<div>e -&gt; A</div>
<div>f -&gt; J</div>
<div>g -&gt; S</div>
<div>h -&gt; B</div>
<div>i -&gt; K</div>
<div>j -&gt; T</div>
<div>k -&gt; C</div>
<div>l -&gt; L</div>
<div>m -&gt; U</div>
<div>n -&gt; D</div>
<div>o -&gt; M</div>
<div>p -&gt; V</div>
<div>q -&gt; E</div>
<div>r -&gt; N</div>
<div>s -&gt; W</div>
<div>t -&gt; F</div>
<div>u -&gt; O</div>
<div>v -&gt; X</div>
<div>w -&gt; G</div>
<div>x -&gt; P</div>
<div>y -&gt; Y</div>
<div>z -&gt; H</div>
<div> </div>
<div>x-&gt;9x+8</div>
</div></mdoxml>
<?xml version="1.0" encoding="UTF-8"?>
<mdoxml version="1.0"><p>This challenge cipher forms part of a very difficult <a href="http://nrich.maths.org/7081">sequence of ciphers</a> suitable for keen groups or individuals, maths clubs and very optional homework challenges. Don't try this in the classroom!</p></mdoxml>
<?xml version="1.0" encoding="UTF-8"?>
<mdoxml version="1.0"><p>This is the second of our <a href="https://nrich.maths.org/7081">challenge ciphers</a>.</p>
<p>We recommend that you attempt them in order, as the solution of each challenge gives a small (and necessary!) hint for the next challenge.</p></mdoxml>
<?xml version="1.0" encoding="UTF-8"?>
<mdoxml version="1.0">
<p> </p>
<div>The llama or Lama glama is a South American camelid, widely used as a pack and meat animal by Andean cultures since pre-hispanic times. Although early writers compared llamas to sheep, their similarity to the camel was soon recognized. They were included in the genus Camelus along with alpaca in the Systema Naturae of Linnaeus. Someone encrypting a message can make decryption more difficult
by choosing unusual words and removing punctuation and the spacing between words. See if you can work out the method used for encrypting this message. Think about sequences if you get stuck. </div>
<div> </div>
<div> </div>
<div>
<div>Affine cipher:</div>
<div>a -> Q</div>
<div>b -> Z</div>
<div>c -> I</div>
<div>d -> R</div>
<div>e -> A</div>
<div>f -> J</div>
<div>g -> S</div>
<div>h -> B</div>
<div>i -> K</div>
<div>j -> T</div>
<div>k -> C</div>
<div>l -> L</div>
<div>m -> U</div>
<div>n -> D</div>
<div>o -> M</div>
<div>p -> V</div>
<div>q -> E</div>
<div>r -> N</div>
<div>s -> W</div>
<div>t -> F</div>
<div>u -> O</div>
<div>v -> X</div>
<div>w -> G</div>
<div>x -> P</div>
<div>y -> Y</div>
<div>z -> H</div>
<div> </div>
<div>x->9x+8</div>
</div>
<p> </p>
</mdoxml>
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A fine thing?
Second challenge cipher
Decision Mathematics and Combinatorics
Combinatorics
Decision Mathematics and Combinatorics
Algorithms
Applications
Codes and cryptography