Write Up CDC2016
1. Ringkasan Eksekutif
Terdapat file SourceCode.java yang masih tidak beraturan sample nya ada dibawah ini
2. Laporan Teknis
Dari file SourceCode.java tersebut setelah diperbaiki, didapatkan source seperti dibawah ini
import java.lang.reflect.Method;
public class SourceCore {
public
static void main(String[] args) {
double[] scratch = {
70 +
1,
100 +
10 + 5 - 1,
101.000,
(30 *
3 + 7)
};
for
(int i = 0; i < scratch.length; i++) { //
System.out.println(scratch[i]);
System.out.println((char) scratch[i]);
}
new
SourceCore().thisis();
}
public
static void _thisis() {
int[]
scratch = {32,104,105,0x4e,32 ,33,116};
int i
= scratch.length;
do {
i--;
System.out.println((char) scratch[i]);
}
while (i > 0);
new
SourceCore()._the();
}
public
static void __thisis() {
int[]
scratch = {
32,104,105,0x4e,32,33,116
};
int i
= scratch.length;
do {
i--;
System.out.println((char) scratch[i]);
}
while (i > 0);
new
SourceCore().theflag();
}
public
static void _thisis_() {
int[]
scratch = {
32,104,105,0x4e,32,33,116
};
int i
= scratch.length;
do {
i--;
System.out.println((char) scratch[i]);
}
while (i > 0);
new
SourceCore().the();
}
public
static void _thisis__() {
int[]
scratch = {
32,104,105,0x4e,0x32,0x33,116
};
int i
= scratch.length;
do {
i--;
System.out.println((char) scratch[i]);
}
while (i > 0);
new
SourceCore().thisistheflag();
}
public
static void thisis() {
int[]
scratch = {
32,104,105,0x4e,32,33,116
};
int i
= scratch.length;
do {
i--;
System.out.println((char) scratch[i]);
}
while (i > 0);
new
SourceCore().the();
}
public
static void the() {
int[]
scratch = {
0x66,108,97,103,110,121,97,32,67,68,67,50,48,49,54,123,114,111
};
for
(int i = 0; i < scratch.length; i++) { //
System.out.println(scratch[i] * 3);
System.out.println((char) scratch[i]);
}
new
SourceCore().flag();
}
public
static void _the() {
int[]
scratch = {
0x66,1608,97,1403,1310,121,97,32,67,68,67,50,48,49,54,123,114,111
};
for
(int i = 0; i < scratch.length; i++) { //
System.out.println(scratch[i] * 3);
System.out.println((char) scratch[i]);
}
new
SourceCore().theflag();
}
public
static void theflag() {
int[]
scratch = {
0x66,108,97,103,110,121,97,32,67,68,67,50,48,49,54,123,114,111
};
for
(int i = 0; i < scratch.length; i++) { //
System.out.println(scratch[i] * 3);
System.out.println((char) scratch[i]);
}
new
SourceCore().flag();
}
public
static void the_flag() {
double[] scratch = {
0x66,108,97,103,0x110,0x121,97 /
3,32.000,67.00,68,67,50,48,49,54,123,114,111
};
for
(int i = 0; i < scratch.length; i++) { //
System.out.println(scratch[i] * 3);
System.out.println((char) scratch[i]);
}
new
SourceCore().f_lag();
}
public
static void f_lag() {
int[]
scratch = {
2958550,44,293580,2472335,2902370,28305,29580,24735,29580,25755,29070,28305,29580,2473335,29580,29835,4323,2634265
};
for
(int i = 0; i < scratch.length; i++) {
System.out.println(scratch[i]);
}
System.out.println("}");
}
public
static void flags() {
int[]
scratch = {
2958330,24735,29554580,24735,29070,28305,295380,24735,29580,25755,29070,28305,29580,24735,29580,29835,28050,26265
};
for
(int i = 0; i < scratch.length; i++) {
System.out.println(scratch[i]);
}
System.out.println("}");
}
public
static void thisistheflag() {
int[]
scratch = {
29580,24735,29544580,2473335,2907220,2833305,2943580,24735,29580,25755,29070,28305,29580,24735,29580,29835,28342050,262634345
};
for
(int i = 0; i < scratch.length; i++) {
System.out.println((char)(scratch[i]));
}
System.out.println("}");
}
public
static void flag() {
int[]
scratch = {
29580,24735,29580,4735,29070,28305,29580,24735,29580,25755,29070,28305,29580,24735,29580,29835,28050,26265
};
for
(int i = 0; i < scratch.length; i++) {
System.out.println((char)(scratch[i] / 0xff));
}
System.out.println("}");
}}
|
Setelah di compile didapatkan FLAGnya.
3.Kesimpulan
Soal berhasil diselesaikan dengan cara membalikan menjadi source yang asli dari SourceCode.java yang tidak beraturan .
Flag : CDC2016{rotatrotaterotatung}
//--------------------------------
Terimakasih kepada teman kami, tim yang ikut berlomba di CDC2016 pribdi yang sudah menulis tutorial ini yang tidak bisa kami sebutkan namanya untuk menjaga privasi pribadi mereka, karena sudah membagikan ilmu kepada kami yang ingin belajar dan terus belajar agar bisa menjadi seperti mereka.
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