羊城杯 re wp
VSole2021-10-07 16:01:00
題的質量還是可以，有些題因為遇到一些問題，沒解出來。花時間來寫wp一是鞏固一些知識點，還有讓更多的人可以互相學習。
BabySmc
看題目就知道代碼肯定被smc處理過了，所以直接動調就ok，也沒有反調試。
先看前面部分。
看看base64加密過程：
密文和比較。
解密腳本
import base64 t=[]encstr = 'H>oQn6aqLr{DH6odhdm0dMe`MBo?lRglHtGPOdobDlknejmGI|ghDb<4'xor = [0xa6, 0xa3, 0xa9, 0xac]for i in range(len(encstr)): t.append(ord(encstr[i]) ^ xor[i % 4])t[-1]=0xE4#由于最后一個是4，是補的，直接改為表中的一個就行。base1 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/' base = [0xE4, 0xC4, 0xE7, 0xC7, 0xE6, 0xC6, 0xE1, 0xC1, 0xE0, 0xC0, 0xE3, 0xC3, 0xE2, 0xC2, 0xED, 0xCD, 0xEC, 0xCC, 0xEF, 0xCF, 0xEE, 0xCE, 0xE9, 0xC9, 0xE8, 0xC8, 0xEB, 0xCB, 0xEA, 0xCA, 0xF5, 0xD5, 0xF4, 0xD4, 0xF7, 0xD7, 0xF6, 0xD6, 0xF1, 0xD1, 0xF0, 0xD0, 0xF3, 0xD3, 0xF2, 0xD2, 0xFD, 0xDD, 0xFC, 0xDC, 0xFF, 0xDF, 0x95, 0x9C, 0x9D, 0x92, 0x93, 0x90, 0x91, 0x96, 0x97, 0x94, 0x8A, 0x8E]ans = ''for i in t: ans += base1[base.index(i)]print(ans)print(base64.b64decode(ans))#SangFor{XSAYT0u5DQhaxveIR50X1U13M-pZK5A0}
DeltX
這道題，流程很亂，通過動調看內存會使分析變的簡單。但是也有坑，就是flag的大小寫的問題，多試吧。
前面部分。
中間數據處理。
腳本
#include int main(){ int a,b; for(a=0;a<=0xffff;a++) { b=0; b=(a-0x9393)&0xffff; if(a*b== 0xE5FD104) { printf("%X %X",a,b); } } }
解出所有數據，拼接起來得到，SangFor{2C7BD2BF862564BAED0B6B6EA94F15BC}，但是不對，然后又一組一組的試，看看哪出了問題，發現是某一組大小寫問題，得到SangFor{2C7BD2BF862564baED0B6B6EA94F15BC}
EasyVM
elf文件，代碼也被加密了，也有自解密函數。
先看看main函數：
然后vm內部就只有自己去慢慢調試分析大概邏輯了。
大概有3中方式加密，前32個字符是異或，然后后面4個是一些運算的加密，后面8個字符又分為兩組進行同一種運算方式方式加密。
寫了個c來打印其過程。
#include int main(){ int opcode[]={ 0xA1, 0xC1, 0x00, 0xB1, 0x77, 0xC2, 0x4A, 0x01, 0x00, 0x00, 0xC1, 0x01, 0xB2, 0x77, 0xC2, 0x19, 0x01, 0x00, 0x00, 0xC1, 0x02, 0xB4, 0x77, 0xC2, 0xDD, 0x01, 0x00, 0x00, 0xC1, 0x03, 0xB3, 0x77, 0xC2, 0x0F, 0x01, 0x00, 0x00, 0xC1, 0x04, 0xB2, 0x77, 0xC2, 0x1B, 0x01, 0x00, 0x00, 0xC1, 0x05, 0xB4, 0x77, 0xC2, 0x89, 0x01, 0x00, 0x00, 0xC1, 0x06, 0xB1, 0x77, 0xC2, 0x19, 0x01, 0x00, 0x00, 0xC1, 0x07, 0xB3, 0x77, 0xC2, 0x54, 0x01, 0x00, 0x00, 0xC1, 0x08, 0xB1, 0x77, 0xC2, 0x4F, 0x01, 0x00, 0x00, 0xC1, 0x09, 0xB1, 0x77, 0xC2, 0x4E, 0x01, 0x00, 0x00, 0xC1, 0x0A, 0xB3, 0x77, 0xC2, 0x55, 0x01, 0x00, 0x00, 0xC1, 0x0B, 0xB3, 0x77, 0xC2, 0x56, 0x01, 0x00, 0x00, 0xC1, 0x0C, 0xB4, 0x77, 0xC2, 0x8E, 0x00, 0x00, 0x00, 0xC1, 0x0D, 0xB2, 0x77, 0xC2, 0x49, 0x00, 0x00, 0x00, 0xC1, 0x0E, 0xB3, 0x77, 0xC2, 0x0E, 0x01, 0x00, 0x00, 0xC1, 0x0F, 0xB1, 0x77, 0xC2, 0x4B, 0x01, 0x00, 0x00, 0xC1, 0x10, 0xB3, 0x77, 0xC2, 0x06, 0x01, 0x00, 0x00, 0xC1, 0x11, 0xB3, 0x77, 0xC2, 0x54, 0x01, 0x00, 0x00, 0xC1, 0x12, 0xB2, 0x77, 0xC2, 0x1A, 0x00, 0x00, 0x00, 0xC1, 0x13, 0xB1, 0x77, 0xC2, 0x42, 0x01, 0x00, 0x00, 0xC1, 0x14, 0xB3, 0x77, 0xC2, 0x53, 0x01, 0x00, 0x00, 0xC1, 0x15, 0xB1, 0x77, 0xC2, 0x1F, 0x01, 0x00, 0x00, 0xC1, 0x16, 0xB3, 0x77, 0xC2, 0x52, 0x01, 0x00, 0x00, 0xC1, 0x17, 0xB4, 0x77, 0xC2, 0xDB, 0x00, 0x00, 0x00, 0xC1, 0x18, 0xB1, 0x77, 0xC2, 0x19, 0x01, 0x00, 0x00, 0xC1, 0x19, 0xB4, 0x77, 0xC2, 0xD9, 0x00, 0x00, 0x00, 0xC1, 0x1A, 0xB1, 0x77, 0xC2, 0x19, 0x01, 0x00, 0x00, 0xC1, 0x1B, 0xB3, 0x77, 0xC2, 0x55, 0x01, 0x00, 0x00, 0xC1, 0x1C, 0xB2, 0x77, 0xC2, 0x19, 0x00, 0x00, 0x00, 0xC1, 0x1D, 0xB3, 0x77, 0xC2, 0x00, 0x01, 0x00, 0x00, 0xC1, 0x1E, 0xB1, 0x77, 0xC2, 0x4B, 0x01, 0x00, 0x00, 0xC1, 0x1F, 0xB2, 0x77, 0xC2, 0x1E, 0x00, 0x00, 0x00, 0xC1, 0x20, 0x80, 0x02, 0x18, 0x00, 0x00, 0x00, 0x23, 0x10, 0xC1, 0x21, 0x80, 0x02, 0x10, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x22, 0x80, 0x02, 0x08, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x23, 0xF7, 0xFE, 0x80, 0x02, 0x05, 0x00, 0x00, 0x00, 0x22, 0x77, 0x10, 0x80, 0x02, 0x07, 0x00, 0x00, 0x00, 0x23, 0x80, 0x02, 0x23, 0x77, 0xF1, 0x98, 0x31, 0x77, 0x10, 0x80, 0x02, 0x18, 0x00, 0x00, 0x00, 0x23, 0x80, 0x02, 0x20, 0xB9, 0xE4, 0x35, 0x31, 0x77, 0x10, 0x80, 0x02, 0x12, 0x00, 0x00, 0x00, 0x22, 0x77, 0xA0, 0xC1, 0x24, 0x80, 0x02, 0x18, 0x00, 0x00, 0x00, 0x23, 0x10, 0xC1, 0x25, 0x80, 0x02, 0x10, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x26, 0x80, 0x02, 0x08, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x27, 0xF7, 0xFE, 0x32, 0x20, 0x43, 0x33, 0x77, 0x80, 0x02, 0x11, 0x00, 0x00, 0x00, 0x22, 0x35, 0x37, 0x38, 0x77, 0x80, 0x02, 0x0D, 0x00, 0x00, 0x00, 0x23, 0x77, 0x38, 0x39, 0x10, 0x32, 0x20, 0x43, 0x33, 0x77, 0x80, 0x02, 0x11, 0x00, 0x00, 0x00, 0x22, 0x35, 0x37, 0x38, 0x77, 0x80, 0x02, 0x0D, 0x00, 0x00, 0x00, 0x23, 0x77, 0x38, 0x39, 0xC7, 0xC1, 0x28, 0x80, 0x02, 0x18, 0x00, 0x00, 0x00, 0x23, 0x10, 0xC1, 0x29, 0x80, 0x02, 0x10, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x2A, 0x80, 0x02, 0x08, 0x00, 0x00, 0x00, 0x23, 0xF7, 0xC1, 0x2B, 0xF7, 0xFE, 0x32, 0x20, 0x43, 0x33, 0x77, 0x80, 0x02, 0x11, 0x00, 0x00, 0x00, 0x22, 0x35, 0x37, 0x38, 0x77, 0x80, 0x02, 0x0D, 0x00, 0x00, 0x00, 0x23, 0x77, 0x38, 0x39, 0x10, 0x32, 0x20, 0x43, 0x33, 0x77, 0x80, 0x02, 0x11, 0x00, 0x00, 0x00, 0x22, 0x35, 0x37, 0x38, 0x77, 0x80, 0x02, 0x0D, 0x00, 0x00, 0x00, 0x23, 0x77, 0x38, 0x39, 0xC8, 0x99}; int i=0; while ( 1 ) { if ( opcode[i] == 0x71 ) { printf("table[6] -= 4"); printf("*table[6] = 0x%x",opcode[i+1]); i += 5; } if ( opcode[i] == 0x41 ) { printf("table[1] += table[2]"); ++i; } if ( opcode[i] == 0x42 ) { printf("table[1] -= table[4];"); ++i; } if ( opcode[i] == 0x43 ) { printf("table[1] *= table[3];"); ++i; } if ( opcode[i] == 0x37 ) { printf("table[1] = table[5];"); ++i; } if ( opcode[i] == 0x38 ) { printf("table[1] ^= table[4];"); ++i; } if ( opcode[i] == 0x39 ) { printf("table[1] ^= table[5];"); ++i; } if ( opcode[i] == 0x35 ) { printf("table[5] = table[1];"); ++i; } if ( opcode[i] == 0xF7 ) { printf("table[9] += table[1];"); ++i; } if ( opcode[i] == 0x44 ) { printf("table[1] /= table[5];"); ++i; } if ( opcode[i] == 0x80 ) { printf("table[2] = 0x%x",*((unsigned int*)(&opcode[i+2]))); i += 6; } if ( opcode[i] == 0x77 ) { printf("table[1] ^= table[9];"); ++i; } if ( opcode[i] == 0x53 ) { printf("(sub_8048580)(*table[3]);"); i += 2; } if ( opcode[i] == 0x22 ) { printf("table[1] >>= table[2];"); ++i; } if ( opcode[i] == 0x23 ) { printf("table[1] <<= table[2];"); ++i; } if ( opcode[i] == 0x99 ) { printf("out"); break; } if ( opcode[i] == 0x76 ) { printf("table[3] = *table[6];"); printf("*table[6] = 0;"); printf("table[6] += 4;"); i += 5; } if ( opcode[i] == 0x54 ) { printf("v6 = table[3];"); printf("*v6 = sub_8048520();"); i += 2; } if ( opcode[i] == 0x30 ) { printf("table[1] |= table[2];"); ++i; } if ( opcode[i] == 0x31 ) { printf("table[1] &= table[2];"); ++i; } if ( opcode[i] == 0x32 ) { printf("table[3] = 0x%x",opcode[i+1]) ; i += 2; } if ( opcode[i] == 9 ) { printf("table[1] = 1877735783;"); ++i; } if ( opcode[i] == 0x10 ) { printf("table[9] = table[1];"); ++i; } if ( opcode[i] == 0x33 ) { printf("table[4] = table[1]"); ++i; } if ( opcode[i] == 0x34 ) { printf("table[2] = 0x%x;",opcode[i+1]); i += 2; } if ( opcode[i] == 0xFE ) { printf("table[1] = table[9];"); ++i; } if ( opcode[i] == 0x11 ) { printf("(sub_8048510)(&unk_8049340, table[1])"); ++i; } if ( opcode[i] == 0xA0 ) { printf("if ( table[1] != 1877735783 )exit"); ++i; } if ( opcode[i] == 0xA1 ) { printf("read"); ++i; } if ( opcode[i] == 0xB1 ) { printf("table[9] = xor[0]"); ++i; } if ( opcode[i] == 0xB2 ) { printf("table[9] = xor[1];"); ++i; } if ( opcode[i] == 0xA4 ) { printf("xor[*(table[8] + 1)] = table[1];"); i += 4; } if ( opcode[i] == 0xB3 ) { printf("table[9] = xor[2];"); ++i; } if ( opcode[i] == 0xB4 ) { printf("table[9] = xor[3];"); ++i; } if ( opcode[i] == 0xC1 ) { printf("table[1] = flag[%d];",opcode[i+1]); i += 2; } if ( opcode[i] == 0xC7 ) { printf("dword_804B060 != table[1]"); ++i; } if ( opcode[i] == 0xC8 ) { printf("dword_804B064 != table[1]"); ++i; } if ( opcode[i] == 0xC2 ) { printf("if ( %d != table[1] )",opcode[i+1]); i+= 5; } }}
前面32個字符如下結構，就是一個異或。
table[1] = flag[0];table[9] = xor[0]table[1] ^= table[9];if ( 74 != table[1] )
#里面的數據都是從opcode提出來的。index=[0xb1,0xb2,0xb4,0xb3,0xb2,0xb4,0xb1,0xb3,0xb1,0xb1,0xb3,0xb3,0xb4,0xb2,0xb3,0xb1,0xb3,0xb3,0xb2,0xb1,0xb3,0xb1,0xb3,0xb4,0xb1,0xb4,0xb1,0xb3,0xb2,0xb3,0xb1,0xb2]table={0xb1:0x7b,0xb2:0x2f,0xb3:0x37,0xb4:0xe8} xor=[]for i in index: xor.append(table[i])print(xor)enc=[0x4a,0x19,0xdd,0xf,0x1b,0x89,0x19,0x54,0x4f,0x4e,0x55,0x56,0x8e,0x49,0xe,0x4b,0x6,0x54,0x1a,0x42,0x53,0x1f,0x52,0xdb,0x19,0xd9,0x19,0x55,0x19,0x0,0x4b,0x1e]for i in range(len(enc)): print(chr(enc[i]^xor[i]),end='')#16584abc45baff901c59dde3b1bb6701
后4個字符邏輯如下：
table[1] = flag[32];table[2] = 0x18table[1] <<= table[2];table[9] = table[1];table[1] = flag[33];table[2] = 0x10table[1] <<= table[2];table[9] += table[1];table[1] = flag[34];table[2] = 0x8table[1] <<= table[2];table[9] += table[1];table[1] = flag[35];table[9] += table[1];table[1] = table[9];table[2] = 0x5table[1] >>= table[2];table[1] ^= table[9];table[9] = table[1];table[2] = 0x7table[1] <<= table[2];table[2] = 0x98f17723table[1] &= table[2];table[1] ^= table[9];table[9] = table[1];table[2] = 0x18table[1] <<= table[2];table[2] = 0x35e4b920table[1] &= table[2];table[1] ^= table[9];table[9] = table[1];table[2] = 0x12table[1] >>= table[2];table[1] ^= table[9];if ( table[1] != 1877735783 )exit
需要特別注意的是里面的0x80對應的指令，比賽時就是在這花了很多時間，還好一步步調，最后找到了。
解法可以考慮爆破，4個字符，也不是很多。
str="abcdefghijklmnopqrstuvwxyz0123456789" for a in str: for b in str: for c in str: for d in str: table=[0]*10 table[1] = ord(a) table[2] = 0x18 table[1] <<= table[2] table[9] = table[1] table[1] =ord(b) table[2] = 0x10 table[1] <<= table[2] table[9] += table[1] table[1] = ord(c) table[2] = 0x8 table[1] <<= table[2] table[9] += table[1] table[1] = ord(d) table[9] = (table[9]+table[1])&0xffffffff table[1] = table[9] table[2] = 0x5 table[1] >>= table[2] table[1] ^= table[9] table[9] = table[1] table[2] = 0x7 table[1] <<= table[2] table[2] = 0x98f17723 table[1] &= table[2] table[1] ^= table[9] table[9] = table[1] table[2] = 0x18 table[1] <<= table[2] table[2] = 0x35e4b920 table[1] &= table[2] table[1] ^= table[9] table[9] = table[1] table[2] = 0x12 table[1] >>= table[2] table[1] ^= table[9] if(table[1]&0xffffffff==1877735783): print(a,b,c,d) break#a 2 5 4
后面8個字符，加密過程也有坑，就是*和<<會產生溢出。也是考慮爆破解。
str="abcdefghijklmnopqrstuvwxyz0123456789" for a in str: for b in str: for c in str: for d in str: table=[0]*10 table[1] = ord(a) table[2] = 0x18 table[1] <<= table[2] table[9] = table[1] table[1] =ord(b) table[2] = 0x10 table[1] <<= table[2] table[9] += table[1] table[1] = ord(c) table[2] = 0x8 table[1] <<= table[2] table[9] += table[1] table[1] = ord(d) table[9] += table[1] table[1] = table[9] table[3] = 0x20 table[1] = (table[1] *table[3])&0xffffffff table[4] = table[1] table[1] ^= table[9] table[2] = 0x11 table[1] >>= table[2] table[5] = table[1] table[1] = table[5] table[1] ^= table[4] table[1] ^= table[9] table[2] = 0xd table[1]= (table[1] <2])&0xffffffff table[1] ^= table[9] table[1] ^= table[4] table[1] ^= table[5] table[9] = table[1] table[3] = 0x20 table[1] = (table[1] *table[3])&0xffffffff table[4] = table[1] table[1] ^= table[9] table[2] = 0x11 table[1] >>= table[2] table[5] = table[1] table[1] = table[5] table[1] ^= table[4] table[1] ^= table[9] table[2] = 0xd table[1] =(table[1] <2])&0xffffffff table[1] ^= table[9] table[1] ^= table[4] table[1] ^= table[5] if(table[1]&0xffffffff==0x283B8E84): print(a,b,c,d) break # table[1] = table[9] # table[3] = 0x20 # table[1] *= table[3] # table[4] = table[1] # table[1] ^= table[9] # table[2] = 0x11 # table[1] >>= table[2] # table[5] = table[1] # table[1] = table[5] # table[1] ^= table[4] # table[1] ^= table[9] # table[2] = 0xd # table[1] <<= table[2] # table[1] ^= table[9] # table[1] ^= table[4] # table[1] ^= table[5] # table[9] = table[1] # table[3] = 0x20 # table[1] *= table[3] # table[4] = table[1] # table[1] ^= table[9] # table[2] = 0x11 # table[1] >>= table[2] # table[5] = table[1] # table[1] = table[5] # table[1] ^= table[4] # table[1] ^= table[9] # table[2] = 0xd # table[1] <<= table[2] # table[1] ^= table[9] # table[1] ^= table[4] # table[1] ^= table[5]#b06c dc23
得到SangFor{16584abc45baff901c59dde3b1bb6701a254b06cdc23}
ez_android
對apk的分析確實比較少，有點可惜，當時不知道為什么md5去網上解，沒解出來，看來得多用幾個網站。
拖到jeb看流程。
去看md5解密，現在網站解密又可以解出來了。。。654321
看看key怎么生成的：
得到key：
去看加密encode函數。
解密
enc_md5 = bytearray.fromhex('c232666f1410b3f5010dc51cec341f58')for i in enc_md5: print(hex(i+1).replace("0x",''),end='')print("") import base64base1 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'t='3lkHi9iZNK87qw0p6U391t92qlC5rwn5iFqyMFDl1t92qUnL6FQjqln76l-P'base = 'TGtUnkaJD0frq61uCQYw3-FxMiRvNOB/EWjgVcpKSzbs8yHZ257X9LldIeh4APom 'ans = ''for i in t: ans += base1[base.index(i)]print(ans)print(base64.b64decode(ans))#c33367701511b4f62ec61ded352059#SangFor{212f4548-03d1-11ec-ab68-00155db3a27e}
safe box
Debug Blocker，這種技術還可以用來hookAPI，還是挺有意思，逆向工程核心原理中也有講解，之前mrctf也遇到過，流程分析起還是不難，就是解的時候總是各種細節問題。。。。，后面看了師傅的wp來看看出現的問題。
瀏覽過整體框架可以知道，需要輸入3個password。
先看看第一個，太大了 爆出來要等太久，用z3確實會快很多。
from z3 import *s = Solver()Seed = BitVec('passwd', 64)v2 = (Seed % 0x2540BE3FF)&0xffv3 = ((Seed % 0x2540BE3FF) >> 8) & 0xFv4 = ((Seed % 0x2540BE3FF) >> 20) & 0xFFFv5 = v2 + 1v6 = ((Seed % 0x2540BE3FF) >> 12)&0xffv7 = v3 + 1v8 = v4 + ~v2v9 = v4v10 = 21 * v6for i in range(16): v3 += v3 ^ v8 v2 += v4 | v2 & v7 v9 += (v10 + v9) % v5 v6 += v6 / v7 s.add(v3 == 0x38006F1)s.add(v2 == 0x7291)s.add(v9 == 0x8B3)s.add(v6 == 0x80)s.add(Seed > 0, Seed <= 0xffffffff) if s.check() == sat: print(s.model())else: print('Not Found!')#0x72335f31#r3_1
輸入完password1后就會觸發一個int3異常，動調看看，注意main函數中的IsDebuggerPresent()，斷點打在sub_140001270()中，也就是程序自己的異常處理函數。
然后去新exe查看該函數，0014000187F處p鍵。
所以password2就是10個字符分5組進行xtea加密，xtea解密如下：
#include void decrypt(unsigned int r ,unsigned int *code ,unsigned int *key){ unsigned int v0,v1,i,delta=0x12345678; unsigned int sum=delta*32; v0=code[0]; v1=code[1]; for(i=0;i<32;i++) { v1-=( ((v0<<5) ^(v0>>6)) +v0 ) ^ ( sum + key[ (sum>>11)&3 ]); sum-=delta; v0-=( ((v1<<5) ^ (v1>>6)) +v1 ) ^ ( sum + key[sum&3] ); } code[0]=v0; code[1]=v1; printf("%c%c",code[0],code[1]);} int main(){ unsigned int key[4]={0x47,0x57,0x48,0x54}; unsigned int r=32; unsigned int code[10]={0x36C128C5, 0x0C4799A63, 0x0E8013E6C, 0x0A9F49003, 0x607EF54A,0x542C2DDF, 0x558BD01C, 0x65512CA2, 0x0BE1E3D05, 0x3C467DAD}; int i; for(i=0;i<5;i++) { decrypt(32,&code[i*2],key); } }//S_s0_fuNny
password3，引發異常，偽隨機數。
然后直接set，ip動調，得到rand()產生的數，雖然生成了32個，實際上只用了前16個。
然后看看亂序函數，通過看比較部分就行了。
問題就來了怎么逆回去，yyds的bxb師傅用了一個小技巧，rand()產生的數有兩個字節，我們的字符只有一個字節，xor不會改變高字節的數，所以我們可以通過高字節的數來還原順序，確實是比較妙，然后我是想直接自己輸入假的字符串，然后得到假密文，從而知道亂序規律，然后逆回去，但是好像不可取，順序還是亂的。
# fake_flag=[0x00004126,0x00002f64,0x00005074,0x00007d08,0x000015e6,0x0000378c,0x00006fbb,0x00000d6b,0x00003f2a,0x0000413c,0x00000ebc,0x000010f8,0x00005c22,0x00001751,0x00001955,0x00001327]# fake_enc=[0x00000029,0x00005074,0x00006fbb,0x0000378c,0x00004823,0x0000413c,0x00007d08,0x00000d6b,0x00003f2a,0x00006784,0x00006df1,0x00005af1,0x00001649,0x000041bb,0x000026e9,0x000001eb,0x00004126,0x00000ebc,0x00001955,0x00001327,0x00002f64,0x000015e6,0x000010f8,0x00005c22,0x00001751,0x000018be,0x00004ae1,0x00003d6c,0x00002cd6,0x000072ae,0x00006952,0x00005f90]# print(hex(fake_enc[22]))# index=[]# for i in fake_flag:# index.append(fake_enc.index(i))# print(index)#這種不得行，得到的index是錯誤的。enc=[0x10a7,0x3f72,0x413f,0x2f62,0x15da,0x5c10,0x174b, 0x6c6b,0x37da,0x3653,0x1204,0x1d0,0x19e3,0x349e, 0x60e2,0x40bf,0x1b1d,0x6f89,0xd5c,0x7d33,0x3785, 0xebc,0x4118,0x5027,0x190a,0x1338,0x74f7,0x4350, 0x3797,0x1dbb,0x2457,0x1f98] enc1=[0x4118, 0x2F62, 0x5027, 0x7D33, 0x15DA, 0x3785,0x6F89, 0x0D5C, 0x3F72, 0x413F, 0x0EBC, 0x10A7,0x5C10, 0x174B, 0x190A, 0x1338]rand=[0x4147, 0x2f06, 0x5017, 0x7d6c, 0x1583, 0x37ea, 0x6fdc, 0xd03, 0x3f43,0x4156, 0xed7, 0x1094, 0x5c4f, 0x173f, 0x193a, 0x1357]s=''for i in range(16): s+=chr((enc1[i]^rand[i])&0xff)print(s)#_d0_YoU_1ik3_t0o
拼接一下GWHT{r3_1S_s0_fuNny_d0_YoU_1ik3_t0o}
OddCode
流下太菜了的淚水，有師傅已經發了詳細的wp了，https://bbs.pediy.com/thread-269328.htm，tql，tql，也該學習一下高級一點的東西了。
VSole
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