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Post by Amen on Mon Apr 11, 2011 10:57 am

Very Happy

Vigenère cipher. In order to defeat a simple letter frequency analysis, the Vigenère cipher encodes a letter into one of several cipher letters, depending on its position
in the input document. Choose a keyword, for example TIGER. Then encode the first letter of the input text like this:
What Do? Aa1+8msPdhtcAAAAAElFTkSuQmCC

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Post by Amen on Mon Apr 11, 2011 10:58 am

The encoded alphabet is just the regular alphabet shifted to start at ,
the first letter of the keyword . The second letter is encrypted
according to the following
map.

What Do? 9wAAAABJRU5ErkJggg==
The
third, fourth, and fifth letters in the input text are encrypted using
the alphabet sequences beginning with characters , , and , and so on.
Because the key is only
five letters long, the sixth letter of the input text is encrypted in the same way as the first.
Write a program that encrypts or decrypts an input text according to this cipher.

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Post by Dice-K on Mon Apr 11, 2011 11:57 am

school just started 2day for me
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Post by meh on Mon Apr 11, 2011 1:28 pm

I wrote a java cipher decoder that does this for you about a year ago if you want it Arrow

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Post by Amen on Mon Apr 11, 2011 4:02 pm

unfortunately it has to be in C++ but thx anyways Very Happy

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Post by Aker on Tue Apr 12, 2011 11:50 pm

I can help you add me on msn

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Post by meh on Wed Apr 13, 2011 1:54 am

Aker wrote:I can help you add me on msn
How are you going to help him write an encryption/decryption program if you can't get a simple banking simulator working Neutral

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Post by m1tch on Wed Apr 13, 2011 5:15 pm

wtf is this shit im so lost
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Post by Aker on Thu Apr 14, 2011 7:23 pm

because encryption/decryption is not so hard also that bank program was coded in C and i code in C++ so i was just trying it in C also if you want some snippets for your project message me.

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Post by Forty on Sat Apr 16, 2011 11:54 am

The answer is 3.14
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Post by Aker on Sat Apr 16, 2011 8:53 pm

Forty wrote:The answer is 3.14
I thought it was over 9000!

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