网站开发拒绝通知书,wordpress-4.9.8,wordpress添加单页,展示型网站模板代码REVERSE-COMPETITION-HGAME2022-Week1easyasmcreakmeFlag Checker猫头鹰是不是猫easyasm
程序一开始将si设置为0#xff0c;然后si和28比较#xff0c;如果si小于28则进入循环 循环体中#xff0c;si作为下标#xff0c;从输入中取值存入al#xff0c;然后al左移4位…
REVERSE-COMPETITION-HGAME2022-Week1easyasmcreakmeFlag Checker猫头鹰是不是猫easyasm
程序一开始将si设置为0然后si和28比较如果si小于28则进入循环 循环体中si作为下标从输入中取值存入al然后al左移4位压入栈 保持下标si不变再重新从输入中取一次值存入al然后al右移4位 右移4位后的结果与之前左移4位的结果相加然后异或0x17最后与已知比较 整个过程相当于将输入中的每一个值的高4位和低4位交换然后异或0x17最后与已知比较 写逆脚本即可得到flag
arr[0x91, 0x61, 0x01, 0xC1, 0x41, 0xA0, 0x60, 0x41, 0xD1, 0x21,0x14, 0xC1, 0x41, 0xE2, 0x50, 0xE1, 0xE2, 0x54, 0x20, 0xC1,0xE2, 0x60, 0x14, 0x30, 0xD1, 0x51, 0xC0, 0x17]
for i in range(len(arr)-1):arr[i]^0x17arr[i]((arr[i]4)0xff)|((arr[i]4)0xff)
print(.join(chr(i) for i in arr))
#hgame{welc0me_to_4sm_w0rld}creakme
输入经过变形TEA加密与已知的密文res比较密钥是ABCD那一串 常规TEA加密过程如下图 可以发现题目的变形TEAdelta不同在32轮循环中多异或一个v3(即sum)而且密钥有交换 对常规TEA的解密过程做相应的变换已知密文和密钥解出明文即为flag
#include stdio.h
#include stdint.hvoid decrypt(uint32_t* v, uint32_t* k) {uint32_t v0 v[0], v1 v[1], sum 1183502080, i; uint32_t delta 0x12345678; uint32_t k0 k[0], k1 k[1], k2 k[2], k3 k[3]; for (i 0; i32; i) { v1 - sum ^ ((v0 4) k0) ^ (v0 sum) ^ ((v0 5) k1);v0 - sum ^ ((v1 4) k2) ^ (v1 sum) ^ ((v1 5) k3);sum - delta;} v[0] v0; v[1] v1;
}int main()
{uint32_t v[2] { 1222194312, 51123276 };//hgame{H4//1391163586, 3986482669-ppy_v4c4//2921328102, 3126465133-ti0n!}uint32_t k[4] { 0x44434241,0x48474645,0x4C4B4A49,0x504F4E4D };int n sizeof(v) / sizeof(uint32_t);decrypt(v, k);for (int i 0; i n; i){for (int j 0; j 4; j){printf(%c, (v[i] (j * 8)) 0xFF);}}printf(\n);return 0;
}
//hgame{H4ppy_v4c4ti0n!}Flag Checker
apk文件jadx-gui打开 首先对输入进行RC4加密密钥为carol 然后对RC4加密的结果进行base64变换最后与已知的base64字符串比较 首先对已知的base64字符串进行逆变换得到RC4加密的密文
import base64
cmg6CITV6GEaFDTYnObFmENOAVjKcQmGncF90WhqvCFyhhsyqq1s
cbase64.b64decode(c)
arr[]
for i in c:arr.append(ord(i))
print(arr)
#[154, 14, 130, 33, 53, 122, 24, 70, 133, 13, 54, 39, 57, 177, 102, 16, 211, 128, 86, 50, 156, 66, 97, 167, 112, 95, 116, 90, 26, 175, 8, 92, 161, 134, 204, 170, 171, 91]已知密文和密钥。解RC4得到的明文即为flag
#includestdio.h
void rc4_init(unsigned char* s, unsigned char* key, unsigned long Len_k)
{int i 0, j 0;char k[256] { 0 };unsigned char tmp 0;for (i 0; i 256; i) {s[i] i;k[i] key[i % Len_k];}for (i 0; i 256; i) {j (j s[i] k[i]) % 256;tmp s[i];s[i] s[j];s[j] tmp;}
}
void rc4_crypt(unsigned char* Data, unsigned long Len_D, unsigned char* key, unsigned long Len_k) //加解密
{unsigned char s[256];rc4_init(s, key, Len_k);int i 0, j 0, t 0;unsigned long k 0;unsigned char tmp;for (k 0; k Len_D; k) {i (i 1) % 256;j (j s[i]) % 256;tmp s[i];s[i] s[j];s[j] tmp;t (s[i] s[j]) % 256;Data[k] Data[k] ^ s[t];}
}
void main()
{unsigned char key[] carol;unsigned long key_len sizeof(key) - 1;unsigned char data[] { 154, 14, 130, 33, 53, 122, 24, 70, 133, 13, 54, 39, 57, 177, 102, 16, 211, 128, 86, 50, 156, 66, 97, 167, 112, 95, 116, 90, 26, 175, 8, 92, 161, 134, 204, 170, 171, 91 };rc4_crypt(data, sizeof(data), key, key_len);for (int i 0; i sizeof(data); i){printf(%c, data[i]);}printf(\n);return;
}
//hgame{weLC0ME_To-tHE_WORLD_oF-AnDr0|D}猫头鹰是不是猫
对输入的处理逻辑主要在sub_1347函数中 第17行是对a2所指地址处的数据进行处理和输入无关可以调试得到 第23行有输入参与整个处理过程相当于一个64元一次方程组在每一个64元一次方程中输入的64个值作为未知量每个未知量的系数是从a2所指地址处取出(可调试得到) 调试取出的密文res和两次执行sub_1347函数时第23行a2所指地址处的数据(arr1和arr2)如下
res[0x25d15d4,0x24c73b4,0x243cf71,0x230134c,0x2132cfe,0x1be2fca,0x142ca26,0xd61955,0x9427a8,0x9b8674,0x90c832,0x8812c7,0x80ba58,0x7981e1,0x72ab68,0x74cb4b,0x723f3f,0x7cc258,0x89cd5c,0x88e2a2,0x8e8906,0x8b88a0,0x8eec8d,0x8f3573,0x8b746f,0x912c82,0x8d7cf2,0x832099,0x7f45a5,0x685aff,0x50a4d2,0x526fe2,0x58923b,0x529ec1,0x516d1a,0x5b7453,0x7028e6,0x89c6fa,0xa5d6ae,0xd37a14,0xb8cfaa,0xb0bb4b,0xae69a4,0xa1154b,0x9dcbe7,0xa1dc20,0xaa07e3,0xb25cb1,0xb2fd98,0xb12f29,0xe428a0,0x11b2184,0x1615722,0x1a502f3,0x1c0aa9d,0x1d4169f,0x1ef8b76,0x233e5bb,0x275a6f0,0x2a9ca35,0x2a8904c,0x2a194ef,0x2926f39,0x28e92c3]
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以arr1为例需要注意的是 arr1的前64个元素是输入的第一个字符(比如a1)分别在64个一次方程中的系数例如
第1个方程arr1[0]*a1arr1[64]*a2...
第2个方程arr1[1]*a1arr1[65]*a2...
第3个方程arr1[2]*a1arr1[66]*a2...于是需要对arr1和arr2进行转置处理如下
arr[]
for i in range(64):tmpfor j in range(64):if j63:tmp str((arr1[j * 64 i]));else:tmpstr((arr1[j*64i])),print(tmp)已知密文res将arr1和arr2进行转置处理后用Matlab进行求解即可得到flag
arr[104,103,97,109,101,123,49,48,48,48,49,49,49,48,48,48,48,48,49,49,48,48,48,48,49,48,48,48,48,48,48,48,48,49,49,48,48,48,49,48,49,48,49,49,48,48,48,48,49,48,48,48,49,48,48,49,49,48,48,49,49,49,49,125]
print(.join(chr(i) for i in arr))
#hgame{100011100000110000100000000110001010110000100010011001111}
