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Cryptography

Whether for breaking codes in WWII, keeping your credit card info safe, or just cracking codes for fun, cryptography is a confluence of computer science and math that encrypts our most important data.

Vigenère Cipher

     

A certain message is encoded with a 2 letter key. The encrypted message is

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BWGWBHQSJBBKNF

We also happen to know that the second character of the plain-text is "I". Break the cipher and find the answer.

The following message is encrypted(via the Vingenre cipher) with the key DAMNDANIEL

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WHQNQSJMVERTTVVPEWFWHMUFIIIMLFQDDRGFBZXJIOGEWRVTPTRNRVYEUCROUEPSLFGGWTABUYOIBVWTAHGAGRRLWPYEZGBSRDIYPIXYLOAMMRKTTHQDEMHPLGTGBNVVIEKOGFDNQVMYHHGAGRRL

Decipher the message to obtain the answer.

The string

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PETERPIPERPICKEDAPECKOFPICKLEDPEPPERS

is encrypted with a key of unknown length. The resulting cipher text is

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RGVGTRKRGTRKEMGFCRGEMQHRKEMNGFRGRRGTU

What is the length of the key?

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