模板:資訊安全:SDES - 修訂歷史

Wells 於 2013年9月12日 (四) 04:29

2013-09-12T04:29:03Z

Wells：/* S-DES的Java程式 */

2013-09-12T00:11:19Z

‎S-DES的Java程式

Wells：/* S-DES的Java程式 */

2013-09-12T00:10:55Z

‎S-DES的Java程式

Wells 於 2013年9月12日 (四) 00:10

2013-09-12T00:10:35Z

Wells：/* S-DES的Java程式 */

2013-04-02T00:39:19Z

‎S-DES的Java程式

Wells 於 2013年4月2日 (二) 00:34

2013-04-02T00:34:31Z

Wells 於 2013年4月1日 (一) 10:07

2013-04-01T10:07:59Z

Wells：/* S-DES填空 */

2013-04-01T10:07:17Z

‎S-DES填空

Wells 於 2013年4月1日 (一) 10:07

2013-04-01T10:07:01Z

Wells 於 2013年4月1日 (一) 10:06

2013-04-01T10:06:25Z

@@ 行 21： / 行 21： @@
 ====S-DES的Java程式====
-<source lang="C++">
+<source lang="c">
   public class sdes{
    private static short[] plainText={0,0,0,0,0,0,0,0}; //明文空間，將輸入的8位元一一放入此short陣列(為求運算方便)

@@ 行 21： / 行 21： @@
 ====S-DES的Java程式====
-<source lang="C">
+<source lang="C++">
   public class sdes{
    private static short[] plainText={0,0,0,0,0,0,0,0}; //明文空間，將輸入的8位元一一放入此short陣列(為求運算方便)

@@ 行 21： / 行 21： @@
 ====S-DES的Java程式====
-<source lang="Java">
+<source lang="C">
   public class sdes{
    private static short[] plainText={0,0,0,0,0,0,0,0}; //明文空間，將輸入的8位元一一放入此short陣列(為求運算方便)

@@ 行 21： / 行 21： @@
 ====S-DES的Java程式====
-<pre>
+<source lang="Java">
   public class sdes{
    private static short[] plainText={0,0,0,0,0,0,0,0}; //明文空間，將輸入的8位元一一放入此short陣列(為求運算方便)
@@ 行 152： / 行 152： @@
+   }
+}
-</pre>
+</source>

@@ 行 23： / 行 23： @@
 <pre>
   public class sdes{
-   private static short[] plainText={0,0,0,0,0,0,0,0};
+   private static short[] plainText={0,0,0,0,0,0,0,0}; //明文空間，將輸入的8位元一一放入此short陣列(為求運算方便)
-   private static short[] Key1 ={1,0,1,0,0,1,0,0};
+   private static short[] Key1 ={1,0,1,0,0,1,0,0}; //子金鑰1
-   private static short[] Key2 ={0,1,0,0,0,0,1,1};
+   private static short[] Key2 ={0,1,0,0,0,0,1,1};//子金鑰2
    private static short[] bitIndex={128,64,32,16,8,4,2,1};
@@ 行 116： / 行 116： @@
      short plainInt,i;
      if (args.length == 0) System.exit(0);
-     plainInt = Short.parseShort(args[0]);
+     plainInt = Short.parseShort(args[0]); //將將輸入的明文字串轉換成short
-     for (i=0; i<8; i++) plainText[i] = ((plainInt & bitIndex[i])== 0) ? (short)0 : (short)1;
+     for (i=0; i<8; i++) plainText[i] = ((plainInt & bitIndex[i])== 0) ? (short)0 : (short)1; //將明文數字中的每一個位元一一抓取出來測試，設定明文陣列
      System.out.print("The plaintext is "); printText(plainText);

←上個修訂		於 2013年4月2日 (二) 00:34 的修訂
行 19：		行 19：

	[[File:S-DES Encryption Detail.png\|600px]]		[[File:S-DES Encryption Detail.png\|600px]]
		+
		+	====S-DES的Java程式====
		+	<pre>
		+	public class sdes{
		+	private static short[] plainText={0,0,0,0,0,0,0,0};
		+	private static short[] Key1 ={1,0,1,0,0,1,0,0};
		+	private static short[] Key2 ={0,1,0,0,0,0,1,1};
		+
		+	private static short[] bitIndex={128,64,32,16,8,4,2,1};
		+
		+	private static char[] IP = {'1','5','2','0','3','7','4','6'}; //"26314857";
		+	private static char[] IP1 = {'3','0','2','4','6','1','7','5'}; //"41357286";
		+	private static char[] EP = {'3','0','1','2','1','2','3','0'}; //"41232341";
		+	private static char[] P4 = {'1','3','2','0'}; //"2431";
		+	private static char[] SW = {'4','5','6','7','0','1','2','3'}; //"56781234";
		+	private static char[] P8 = {'5','2','6','3','7','4','9','8'}; //637485A9";
		+	private static char[] P10 = {'2','4','1','6','3','9','0','8','7','5'}; //35274A1986";
		+
		+	private static short[][] S0 = {{1,0,3,2},
		+	{3,2,1,0},
		+	{0,2,1,3},
		+	{3,1,3,2}};
		+
		+	private static short[][] S1 = {{0,1,2,3},
		+	{2,0,1,3},
		+	{3,0,1,0},
		+	{2,1,0,3}};
		+
		+
		+	private static short[] tempText = {0,0,0,0,0,0,0,0};
		+
		+	private static void printText(short[] Text){
		+	int i;
		+	for(i=0;i<8;i++) System.out.print(Text[i]);
		+	System.out.println();
		+	}
		+
		+	public static void fx(short[] PT, short[] Key){
		+	int i,r,c,s;
		+	short[] leftText = {0,0,0,0};
		+	short[] rightText = {0,0,0,0};
		+	short[] fText = {0,0,0,0,0,0,0,0};
		+	short[] temp4Text = {0,0,0,0};
		+
		+	for(i=4;i<8;i++) rightText[i-4] = PT[i]; //extract right part of plaintext
		+
		+	//perform EP
		+	for(i=0; i<8; i++) tempText[i] = rightText[(short)EP[i]-48];
		+	for(i=0; i<8; i++) fText[i] = tempText[i];
		+	System.out.print("After E/P : ");printText(fText);
		+
		+	for(i=0; i<8; i++) fText[i] ^= Key[i]; //Xor!
		+	System.out.print("Key is "); printText(Key);
		+	System.out.print("After XOR with Key : ");printText(fText);
		+
		+	for(i=0;i<4;i++) leftText[i] = fText[i];
		+	for(i=4;i<8;i++) rightText[i-4] = fText[i];
		+
		+	//perform S0 and S1
		+	r = (leftText[0]<<1) + leftText[3]; System.out.print("S0, Row is "+r+",");
		+	c = (leftText[1]<<1) + leftText[2]; System.out.print("Col is "+c+" ");
		+	s = S0[r][c];
		+	System.out.println("S0 is "+s);
		+	temp4Text[0] = ((s&2) == 0)? (short)0:(short)1;
		+	temp4Text[1] = ((s&1) == 0)? (short)0:(short)1;
		+
		+	r = (rightText[0]<<1) + rightText[3]; System.out.print("S1, Row is "+r+",");
		+	c = (rightText[1]<<1) + rightText[2]; System.out.print("Col is "+c+" ");
		+	s = S1[r][c];
		+	System.out.println("S1 is "+s);
		+	temp4Text[2] = ((s&2) == 0)? (short)0:(short)1;
		+	temp4Text[3] = ((s&1) == 0)? (short)0:(short)1;
		+
		+	//Perform P4
		+	for(i=0; i<4; i++) tempText[i] = temp4Text[(short)P4[i]-48];
		+	for(i=0; i<4; i++) temp4Text[i] = tempText[i];
		+	System.out.print("Apply P4 ");
		+	for(i=0; i<4; i++) System.out.print(temp4Text[i]);
		+	System.out.println();
		+
		+	for(i=0; i<4; i++) leftText[i] = PT[i];
		+
		+	//Xor left and right processed with F-Box
		+	System.out.print("After XOR with the left part(See the above of diagram):");
		+	for(i=0; i<4; i++) {
		+	leftText[i] ^= temp4Text[i];
		+	System.out.print(leftText[i]);
		+	}
		+	System.out.println();
		+	for(i=0; i<4; i++) PT[i] = leftText[i];
		+
		+
		+	}
		+
		+	public static void main(String args[]){
		+	short plainInt,i;
		+	if (args.length == 0) System.exit(0);
		+	plainInt = Short.parseShort(args[0]);
		+
		+	for (i=0; i<8; i++) plainText[i] = ((plainInt & bitIndex[i])== 0) ? (short)0 : (short)1;
		+	System.out.print("The plaintext is "); printText(plainText);
		+
		+	//Perform IP operation
		+	for(i=0; i<8; i++) tempText[i] = plainText[(short)IP[i]-48];
		+	for(i=0; i<8; i++) plainText[i] = tempText[i];
		+	System.out.print("plaintexst after IP is ");
		+	printText(plainText);
		+
		+	//Round 1
		+
		+	System.out.println("Round 1..... ");
		+	fx(plainText, Key1);
		+	System.out.print("After round1, the plaintext is ");printText(plainText);
		+
		+	//Perform SW
		+	for(i=0; i<8; i++) tempText[i] = plainText[(short)SW[i]-48];
		+	for(i=0; i<8; i++) plainText[i] = tempText[i];
		+	System.out.print("After SW, plaintext is ");
		+	printText(plainText);
		+
		+	//Round 2
		+	System.out.println("\nRound 2..... ");
		+	fx(plainText, Key2);
		+	System.out.print("After round 2, the plaintext is ");printText(plainText);
		+
		+	//Perform IP-1
		+	for(i=0; i<8; i++) tempText[i] = plainText[(short)IP1[i]-48];
		+	for(i=0; i<8; i++) plainText[i] = tempText[i];
		+	System.out.print("Finally, ciphertext is ");
		+	printText(plainText);
		+
		+	}
		+	}
		+	</pre>

@@ 行 2： / 行 2： @@
 * [http://sdrv.ms/YX9S0s S-DES教學]
+* [http://sdrv.ms/125igf1 S-DES填空表單]
 Simplified DES (S-DES) has similar properties and structure to DES with much smaller parameters (See following S-DES scheme).
@@ 行 19： / 行 19： @@
 [[File:S-DES Encryption Detail.png|600px]]

←上個修訂		於 2013年4月1日 (一) 10:07 的修訂
行 20：		行 20：
	[[File:S-DES Encryption Detail.png\|600px]]		[[File:S-DES Encryption Detail.png\|600px]]

−	====S-DES填空====	+	====S-DES填空==== [http://sdrv.ms/125igf1]
−	[http://sdrv.ms/125igf1]

←上個修訂		於 2013年4月1日 (一) 10:06 的修訂
行 19：		行 19：

	[[File:S-DES Encryption Detail.png\|600px]]		[[File:S-DES Encryption Detail.png\|600px]]
		+
		+	[http://sdrv.ms/125igf1 S-DES填空]