Problem 1500. Kryptos - CIA Cypher Sculpture: Vignere Decryption

Created by Richard Zapor

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The <a href = "http://en.wikipedia.org/wiki/Kryptos">Kryptos Sculpture</a> contains four encypted messages.This Challenge is to Decrypt two of the original messages from the sculpture.The method employed is <a href = "http://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher">Vigenere Decryption</a>. One clarification is that "?" are removed from the coding sequence and then re-inserted in the final encoded message.Original phrase: Between subtle shading and the absence of light lies the nuance of iqlusion.For coding purposes spaces and punctuation are removed, except "?".Decode Phrase: EMUFPHZLRFAXYUSDJKZLDKRNSHGNFIVJYQTQUXQBQVYUVLLTREVJYQTMKYRDMFDInput: Decode Phrase, Vigenere alphabet word, Vigenere shift wordVigenere alphabet word ='KRYPTOS';Vigenere shift word ='PALIMPSEST';Output: BETWEENSUBTLESHADINGANDTHEABSENCEOFLIGHTLIESTHENUANCEOFIQLUSIONThe decryption matrix for this case:<pre class="language-matlab">KRYPTOSABCDEFGHIJLMNQUVWXZ
</pre><pre class="language-matlab">PTOSABCDEFGHIJLMNQUVWXZKRY
ABCDEFGHIJLMNQUVWXZKRYPTOS
LMNQUVWXZKRYPTOSABCDEFGHIJ
IJLMNQUVWXZKRYPTOSABCDEFGH
MNQUVWXZKRYPTOSABCDEFGHIJL
PTOSABCDEFGHIJLMNQUVWXZKRY
SABCDEFGHIJLMNQUVWXZKRYPTO
EFGHIJLMNQUVWXZKRYPTOSABCD
SABCDEFGHIJLMNQUVWXZKRYPTO
TOSABCDEFGHIJLMNQUVWXZKRYP
</pre>Follow Up Challenges:1) <a href = "http://www.mathworks.com/matlabcentral/cody/problems/1499-kryptos-cia-cypher-sculpture-vigenere-encryption">Vigenere Encryption</a>2) Dictionary search3) KRYPTOS Part IV<a href = "http://math.ucsd.edu/~crypto/Projects/KarlWang/index2.html#1">KRYPTOS Solutions</a>

The <http://en.wikipedia.org/wiki/Kryptos Kryptos Sculpture> contains four encypted messages.

This Challenge is to Decrypt two of the original messages from the sculpture.

The method employed is <http://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher Vigenere Decryption>. One clarification is that "?" are removed from the coding sequence and then re-inserted in the final encoded message.

Original phrase: Between subtle shading and the absence of light lies the nuance of iqlusion.

For coding purposes spaces and punctuation are removed, except "?".

Decode Phrase: EMUFPHZLRFAXYUSDJKZLDKRNSHGNFIVJYQTQUXQBQVYUVLLTREVJYQTMKYRDMFD

*Input:* Decode Phrase, Vigenere alphabet word, Vigenere shift word

Vigenere alphabet word ='KRYPTOS';

Vigenere shift word ='PALIMPSEST';

*Output:* BETWEENSUBTLESHADINGANDTHEABSENCEOFLIGHTLIESTHENUANCEOFIQLUSION

The decryption matrix for this case:

KRYPTOSABCDEFGHIJLMNQUVWXZ

PTOSABCDEFGHIJLMNQUVWXZKRY
  ABCDEFGHIJLMNQUVWXZKRYPTOS
  LMNQUVWXZKRYPTOSABCDEFGHIJ
  IJLMNQUVWXZKRYPTOSABCDEFGH
  MNQUVWXZKRYPTOSABCDEFGHIJL
  PTOSABCDEFGHIJLMNQUVWXZKRY
  SABCDEFGHIJLMNQUVWXZKRYPTO
  EFGHIJLMNQUVWXZKRYPTOSABCD
  SABCDEFGHIJLMNQUVWXZKRYPTO
  TOSABCDEFGHIJLMNQUVWXZKRYP

Follow Up Challenges:

1) <http://www.mathworks.com/matlabcentral/cody/problems/1499-kryptos-cia-cypher-sculpture-vigenere-encryption Vigenere Encryption>

2) Dictionary search

3) KRYPTOS Part IV

<http://math.ucsd.edu/~crypto/Projects/KarlWang/index2.html#1 KRYPTOS Solutions>

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Last Solution submitted on May 25, 2023

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Problem 1500. Kryptos - CIA Cypher Sculpture: Vignere Decryption

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