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diff --git a/src/ScharedSecret.java b/src/ScharedSecret.java
new file mode 100644 (file)
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--- /dev/null
+++ b/src/ScharedSecret.java
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+import java.sql.Time;
+import java.util.Random;
+
+public class ScharedSecret {
+       static Random rand=new Random();
+       
+       public static int r10(){
+               return rand.nextInt(10);
+       }
+       
+       public static int[] encodeBit(boolean bit){
+               int threshold=22;
+               int dist=3;
+               
+               int low = threshold-dist;
+               int high = threshold+dist;
+               
+               int d1,d2,d3,d4,d5;
+               //System.out.println("\nbit: "+(bit?1:0));              
+                       if (bit){                               
+                               //System.out.println("bounds: ["+threshold+"..."+high+"]");
+                               d1=r10();
+                               while(d1+18<threshold) d1=r10();
+                               //System.out.println("d1 = "+d1);
+                               
+                               d2=r10();
+                               while (d1+d2+9<threshold||d1+d2>high) d2=r10();
+                               //System.out.println("d2 = "+d2);
+                               
+                               d3=r10();
+                               while (d1+d2+d3<threshold||d1+d2+d3>high)d3=r10();
+                               //System.out.println("d3 = "+d3);
+                               
+                               d4=r10();                               
+                               while (d1+d2+d3+d4 > high) d4=r10();
+                               //System.out.println("d4 = "+d4);
+                               
+                               d5=r10();                               
+                               while (d1+d2+d3+d4+d5 > high) d5=r10();
+                               //System.out.println("d5 = "+d5);
+                               
+                               
+                       } else {
+                               //System.out.println("bounds: ["+low+"..."+threshold+"]");
+                               d1=r10();
+                               while(d1+18<low) d1=r10();
+                               //System.out.println("d1 = "+d1);
+                               
+                               d2=r10();
+                               while (d1+d2+9<low) d2=r10();
+                               //System.out.println("d2 = "+d2);
+                               
+                               d3=r10();
+                               while (d1+d2+d3>threshold||d1+d2+d3<low)d3=r10();
+                               //System.out.println("d3 = "+d3);
+                               
+                               d4=r10();                               
+                               while (d1+d2+d3+d4>threshold||d1+d2+d3+d4<low) d4=r10();
+                               //System.out.println("d4 = "+d4);
+                               
+                               d5=r10();                               
+                               while (d1+d2+d3+d4+d5 > threshold||d1+d2+d3+d4+d5<low) d5=r10();
+                               //System.out.println("d5 = "+d5);
+                       }                       
+               
+                       //System.out.println(""+d1+d2+d3+d4+d5+" ("+(d1+d2+d3+d4+d5)+")");
+               int[] result = {d1,d2,d3,d4,d5};
+               return result;
+       }
+       
+       public static String[] encodeChar(char c){
+               String binary = Integer.toBinaryString(c & 0xFF);
+               
+               while (binary.length()<8) binary='0'+binary;
+               System.out.print(binary+" ");
+               String code1="";
+               String code2="";
+               String code3="";
+               String code4="";
+               String code5="";
+               for (int i=0; i<8;i++){
+                       int[] digits = encodeBit(binary.charAt(i)=='1');
+                       int index = rand.nextInt(4);                    
+                       code1+=digits[index];
+                       if (index!=4)digits[index]=digits[4]; // move last digit to position of used digit
+                       
+                       index = rand.nextInt(3);
+                       code2+=digits[index];
+                       if (index!=3)digits[index]=digits[3]; // move last digit to position of used digit
+                       
+                       index = rand.nextInt(2);                        
+                       code3+=digits[index];
+                       if (index!=2)digits[index]=digits[2]; // move last digit to position of used digit
+                       
+                       index = rand.nextInt(1);
+                       code4+=digits[index];
+                       code5+=digits[1-index];
+               }
+               String[] result = {code1,code2,code3,code4,code5};
+               return result;
+       }
+       
+       public static void main(String[] args) {
+               String secret="gnome-keyring";
+               String code1="";
+               String code2="";
+               String code3="";
+               String code4="";
+               String code5="";
+               System.out.print("  Binary: ");
+               for (int i=0; i<secret.length();i++){
+                       String[] codes = encodeChar(secret.charAt(i));
+                       code1+=codes[0]+" ";
+                       code2+=codes[1]+" ";
+                       code3+=codes[2]+" ";
+                       code4+=codes[3]+" ";
+                       code5+=codes[4]+" ";
+               }
+               System.out.println();
+               System.out.println("\nSecret 1: "+code1);
+               System.out.println("\nSecret 2: "+code2);
+               System.out.println("\nSecret 3: "+code3);
+               System.out.println("\nSecret 4: "+code4);
+               System.out.println("\nSecret 5: "+code5);
+               System.out.print("\nChecksum: ");
+               for (int i=0; i<code1.length(); i++){
+                       
+                       if (i%9==8) {
+                               System.out.print(" ");
+                       } else {
+                               System.out.print((code1.charAt(i)+code2.charAt(i)+code3.charAt(i)+code4.charAt(i)+code5.charAt(i))>(240+22)?1:0);
+                       }
+               }
+       }
+}