java - 频率攻击，尝试打印时字符显示不正确（上为下，下为上）
问题描述
我正在进行频率攻击以获取文本的加密密钥。我写了一个，但是获得的密钥与使用的密钥几乎相同，但是，现在上面的字符较低，下面的字符在上面。此外，甚至没有显示数字。我真的不知道如何解决这个问题。
这是涉及的代码：
public static char[] encryptionKey = new char[4];
public static String letters = "0123456789 abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public static char[] stringToCharArray(String str){
char[] res = new char[str.length()];
for (int i = 0; i < str.length(); i++){
res[i] = str.charAt(i);
}
return res;
}
public static void G(){
for (int i = 0; i < 4; i++){
Random random = new Random();
encryptionKey[i] = letters.charAt(random.nextInt(letters.length()));
}
}
public static String E(String clearText){
char[] clearTextChars = stringToCharArray(clearText);
char[] encryptedTextChars = new char[clearTextChars.length];
for (int i = 0; i < clearTextChars.length; i++){
encryptedTextChars[i] = (char) (clearTextChars[i] ^ encryptionKey[i % 4]);
}
return new String(encryptedTextChars);
}
public static String D(String encryptedText){
char[] encryptedTextChars = stringToCharArray(encryptedText);
char[] clearTextChars = new char[encryptedTextChars.length];
for (int i = 0; i < encryptedTextChars.length; i++){
clearTextChars[i] = (char) (encryptedTextChars[i] ^ encryptionKey[i % 4]);
}
return new String(clearTextChars);
}
public static char maxOccuringChar(String text){
int[] counter = new int[256];
for (int i = 0; i < text.length(); i++){
counter[text.charAt(i)]++;
}
int max = -1;
char res = ' ';
for (int i = 0; i < text.length(); i++){
if (max < counter[text.charAt(i)]){
max = counter[text.charAt(i)];
res = text.charAt(i);
}
}
return res;
}
public static String[] splitString(String str){
String[] parts = new String[4];
parts[0] = "";
parts[1] = "";
parts[2] = "";
parts[3] = "";
char[] strChars = stringToCharArray(str);
for (int i = 0; i < strChars.length; i++){
parts[i%4] += strChars[i];
}
return parts;
}
public static char[] maxOccOnParts(String[] parts){
char[] possibleKey = new char[4];
possibleKey[0] = maxOccuringChar(parts[0]);
System.out.println("p1 ->"+(int) possibleKey[0]);
possibleKey[1] = maxOccuringChar(parts[1]);
System.out.println("p2 ->"+(int) possibleKey[1]);
possibleKey[2] = maxOccuringChar(parts[2]);
System.out.println("p3 ->"+(int) possibleKey[2]);
possibleKey[3] = maxOccuringChar(parts[3]);
System.out.println("p4 ->"+(int) possibleKey[3]);
return possibleKey;
}
public static void printEncryptionKey(){
System.out.println("Encryption key : "+ new String(encryptionKey));
}
public static void main(String[] args) {
G();
printEncryptionKey();
String test = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.";
// System.out.println("Length = "+test.length());
// System.out.println("Split = "+test.length()/4);
String testEncrypted = E(test);
String testDecrypted = D(testEncrypted);
System.out.println("String : " + test);
System.out.println("Encrypted : " + testEncrypted);
System.out.println("Decrypted : " + testDecrypted);
String[] strArray = splitString(testEncrypted);
for (String str : strArray) {
System.out.println(str);
}
System.out.println("MaxOccuringChar per split part");
char[] key = maxOccOnParts(strArray);
for (char ch : key){
System.out.println(ch);
}
}
这是此代码可以创建的输出之一：
Encryption key : 3Gad
String : Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
Encrypted : (^g(@2
DZ4AZJg^*DG"(DG/DC5
G.&3V4G..F4JiA(\5 F*A
R4AV"DG/DZ)@34AG&R5DW2
JgK3AE"D@.Vg
VgPQwH0 ]g
2](
]33
V>AXgDT&
^"DQ(g(/4E.Wg Q+.DG(A R,DRgC"AC"
Gg
_>AZ1DP"F@kAF3A_4DG/D_".\V$\3V4G.g^&
Z)DV4]_+DF)
R)WiA-Gg@g
A.Wg C2
R4D\!A(V3@"D@/G4A\)Z)"
Tg-
A"
G/AV4Dz7^g@4V4MDR)D^(5VJg
@/AF%
Tg
U3A"Z,Dr+@g1T",X"DZF#
TgA4
]4A
Ug-
A"
#7^>AV?D\!A["AA.Z)DR)DG>@"Z)DZ)@3g-
A"
]#G5C@gR)A#AF* Dz7^g @gV)A["A
3GgV5AZ)3 vTT4MDD/
&DF)
\0DC5
Jg3Vg&AR+
WgA&
_"DZ3A\g
X"A3VgV$ V)A\(
E"AV)A.gG@(A["V&DZ)
P3 "
] A@4G>@"Z)H5 R.
G/A["AV+@"A(07F+Z4.DG/D~WT@g
Ug-G5V3A["@g
]. ]3
[g@,A-C4 7@&@kA]#A \5DA"]3
X"A%_#V[.4G0Vg
W.1@.
@g
V*A-C4
Decrypted : Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum. Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
^@ZZJ^GGCGVGFJ\FRVGZ@GRWJKE@VV]]]XTVUC]PQGRRCC^QEWG_ZPF@F_G_\V\VG^ZV]_FRWG@CAWZGAR\V@@G\ZTAz^@VR^VJGV\F@TUAZr@TXZFTA]UAz^\F@^^V\[AZRG@ZZ@Az^@V[]G@RAFGVZDF\CGGRJVWA_Z\XVVV\[@ZJEVAG@[VZP]G@ZR]@G_]]FZG@G[V@UGV[@]]VC@@]\A][@CQ[GVX_VV]W@@VC
(g24*g*"(/5.&34..4i5*4"/)34&52g3".ggw0g2(733g&>g"#5+.(,g"""(g/4.gg>1"5k34/".g$)34.g&)43+))igg2.g3v43/"4!3"/4))g"7g44)(5)g/47%/g3",+g"")#g44g"7i5*g7#>?!".))>"))3g"7gg)"#5g)#*3g5)3v4/&)05"(&+g3gg&"3g"3g$)(&21)(g").gg("&)"3.>")5. 4.>$ g07+4./~g/"+"g53"g3.
*47&k#5"30g,g+.40g"#
5$.1.g
*4
(
AAAA
A-AAAAAA
MA
AA-
AAA-A
AAA
A TM
A
A
A
AAA (WAAA-AAAA
DDD
(
DDD D
QH
D
DD D
DDD
DD
-
RDDD(D
DDD
DD
DDDDD
CTD D
D
D
D
D JDD
DH
DDT
- D
%
-
MaxOccuringChar per split part
Encryption key found:
p1 ->19
p2 ->103
p3 ->65
p4 ->68
g
A
D
我们可以看到，与顶部的原始加密密钥相比，这些字符被“反转”了，并且没有显示数字，但我打印了这些字符的 int 值，看看我是否能找到一些东西......我没有不。
老实说，我不知道这个问题何时开始，也不知道如何解决。预期的输出将是在输出开头使用的加密密钥。我想我的攻击是有效的，因为它是相同的字母。
请问有什么建议可以解决这个问题？
谢谢。
解决方案
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