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POEncrypting and decrypting part of the ASCII table
 

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  1. POEncrypting and decrypting part of the ASCII table
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    <p>I have made small encryption program that uses to keys rot7 and rot13. Everything works fine except two 6 letters uvwxyz.</p> <p>If I type ABCDEFGHIJKLMNOPQRSTUVWXYZ it encrypts and decrypts no problem. However, if I enter the same in lower case letters then uvwxyz do not work. </p> <p>Having said this, I have allowed all the writable characters within the ascii table as the valid range as follows:</p> <pre><code>// allow all writable characters from 32 to 255 if ((str[i] &gt;= 32 ) &amp;&amp; (str[i] &lt;=255)) { str[i] -= key; } </code></pre> <p>Here is the process of encryption:</p> <pre><code> cout &lt;&lt; endl; cout &lt;&lt; "Encrypting process started " &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "--------------------------- " &lt;&lt; endl; //get the string length int i = 0; int length = str.length(); int key = rot13 ; int k = 5; int multiple = 0; int count = 0; cout &lt;&lt; "the text to encrypt is: " &lt;&lt; str &lt;&lt; endl; cout &lt;&lt; "text length is: " &lt;&lt; length &lt;&lt; endl; cout &lt;&lt; "using rot13"&lt;&lt;endl; cout &lt;&lt;"---------------------------" &lt;&lt; endl; cout &lt;&lt; "using rot13" &lt;&lt; endl; //traverse the string for(i = 0; i &lt; length; i++) { count ++; cout &lt;&lt; left; //if it is a multiple of 5 not the first character change the key if((multiple = (( i % 5 ) == 0)) &amp;&amp; (count != 1) &amp;&amp; (key == rot13)){ key = rot7; } //if it is a multiple of 5 not the first character change the key else if((multiple = (( i % 5 ) == 0)) &amp;&amp; (count != 1) &amp;&amp; (key == rot7) ) { key = rot13; } // Capital letters are 65 to 90 (a - z) if ((str[i] &gt;= 32) &amp;&amp; (str[i] &lt;= 255)) { str[i] += key; } } return str; </code></pre> <p>How is it possible that the capital letters work and not the lower case if I have allowed this range? Can it be because of something else? I have added these captures with what happens step by step... hopefully this helps</p>
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    1. PTQuestion
    1. USJonathan Leffler
    1. USbluetxxth
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    1. PO
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    1. COCan you show us it not working?
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      1. POEncrypting and decrypting part of the ASCII table
      1. USJoseph Mansfield
    2. COsure I can I am going to edit and put up a capture
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      1. POEncrypting and decrypting part of the ASCII table
      1. USbluetxxth
    3. COUm, I meant just show us the full code and the output it's giving you.
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      1. POEncrypting and decrypting part of the ASCII table
      1. USJoseph Mansfield
 

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