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[原创]kctf2021 第四题 英雄救美
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发表于: 2021-5-17 22:21
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载入IDA，这里对输入进行了三个判断，长度是否大于64，是否是特定数组中的字符，是否符合数组。
取出在数组中的位置，进行如下操作，存入二维数组，判断是否为符合数独
使用脚本求出数独
得到的正确数独为
按照空的顺序打印出字符串即可，每行后加上没有输入的位数。
之后的逻辑为：求出其MD5值，利用这个MD5对后面代码进行解密，只有正确的MD5才会是程序正确运行形式为，
# 特定数组inum = [0x24, 0x42, 0x50, 0x56, 0x3A, 0x75, 0x62, 0x66, 0x59, 0x70, 0x7D, 0x5D, 0x44, 0x74, 0x4E, 0x3E,
0x61, 0x54, 0x5E, 0x4D, 0x47, 0x6D, 0x4A, 0x51, 0x23, 0x2A, 0x48, 0x72, 0x60, 0x4F, 0x27, 0x77,
0x6A, 0x69, 0x63, 0x30, 0x21, 0x68, 0x64, 0x79, 0x7B, 0x6F, 0x5A, 0x7A, 0x2D, 0x40, 0x6E, 0x2B,
0x3F, 0x26, 0x25, 0x73, 0x5F, 0x2F, 0x67, 0x3C, 0x65, 0x5B, 0x57, 0x29, 0x58, 0x55, 0x78, 0x52,
0x46, 0x53, 0x4C, 0x52, 0x41, 0x3B, 0x2E, 0x6C, 0x3D, 0x43, 0x45, 0x6B, 0x76, 0x4B, 0x2D, 0x28
]# 特定数组inum = [0x24, 0x42, 0x50, 0x56, 0x3A, 0x75, 0x62, 0x66, 0x59, 0x70, 0x7D, 0x5D, 0x44, 0x74, 0x4E, 0x3E,
0x61, 0x54, 0x5E, 0x4D, 0x47, 0x6D, 0x4A, 0x51, 0x23, 0x2A, 0x48, 0x72, 0x60, 0x4F, 0x27, 0x77,
0x6A, 0x69, 0x63, 0x30, 0x21, 0x68, 0x64, 0x79, 0x7B, 0x6F, 0x5A, 0x7A, 0x2D, 0x40, 0x6E, 0x2B,
0x3F, 0x26, 0x25, 0x73, 0x5F, 0x2F, 0x67, 0x3C, 0x65, 0x5B, 0x57, 0x29, 0x58, 0x55, 0x78, 0x52,
0x46, 0x53, 0x4C, 0x52, 0x41, 0x3B, 0x2E, 0x6C, 0x3D, 0x43, 0x45, 0x6B, 0x76, 0x4B, 0x2D, 0x28
]# 原数独数组map = [0x00, 0x04, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
0x09, 0x02, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x07,
0x08, 0x03, 0x00, 0x00, 0x00, 0x05, 0x04, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x04, 0x09, 0x00, 0x00, 0x00, 0x07, 0x01,
0x03, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x09, 0x04,
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00
]# 原数独数组map = [0x00, 0x04, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00,
0x09, 0x02, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x07,
0x08, 0x03, 0x00, 0x00, 0x00, 0x05, 0x04, 0x00, 0x00,
0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x04, 0x00,
0x00, 0x00, 0x04, 0x09, 0x00, 0x00, 0x00, 0x07, 0x01,
0x03, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x09, 0x04,
0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00
]import datetime
class solution(object):
def __init__(self,board):
self.b = board
self.t = 0
def check(self,x,y,value):
for row_item in self.b[x]:
if row_item == value:
return False
for row_all in self.b:
if row_all[y] == value:
return False
row,col=x/3*3,y/3*3
row3col3=self.b[row][col:col+3]+self.b[row+1][col:col+3]+self.b[row+2][col:col+3]
for row3col3_item in row3col3:
if row3col3_item == value:
return False
return True
def get_next(self,x,y):
for next_soulu in range(y+1,9):
if self.b[x][next_soulu] == 0:
return x,next_soulu
for row_n in range(x+1,9):
for col_n in range(0,9):
if self.b[row_n][col_n] == 0:
return row_n,col_n
return -1,-1 def try_it(self,x,y):
if self.b[x][y] == 0:
for i in range(1,10):
self.t+=1
if self.check(x,y,i):
self.b[x][y]=i
next_x,next_y=self.get_next(x,y)
if next_x == -1: #
return True #
else:
end=self.try_it(next_x,next_y)
if not end: #
self.b[x][y] = 0 #
else:
return True
def start(self):
begin = datetime.datetime.now()
if self.b[0][0] == 0:
self.try_it(0,0)
else:
x,y=self.get_next(0,0)
self.try_it(x,y)
for i in self.b:
print i
end = datetime.datetime.now()
print '\ncost time:', end - begin
print 'times:',self.t
return
s=solution(
[[0x00, 0x04, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00],
[0x09, 0x02, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x07],
[0x08, 0x03, 0x00, 0x00, 0x00, 0x05, 0x04, 0x00, 0x00],
[0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00],
[0x00, 0x00, 0x00, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00],
[0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x04, 0x00],
[0x00, 0x00, 0x04, 0x09, 0x00, 0x00, 0x00, 0x07, 0x01],
[0x03, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x09, 0x04],
[0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x06, 0x00]]
)
s.start()import datetime
class solution(object):
def __init__(self,board):
self.b = board
self.t = 0
def check(self,x,y,value):
for row_item in self.b[x]:
if row_item == value:
return False
for row_all in self.b:
if row_all[y] == value:
return False
row,col=x/3*3,y/3*3
row3col3=self.b[row][col:col+3]+self.b[row+1][col:col+3]+self.b[row+2][col:col+3]
for row3col3_item in row3col3:
if row3col3_item == value:
return False
return True
def get_next(self,x,y):
for next_soulu in range(y+1,9):
if self.b[x][next_soulu] == 0:
return x,next_soulu
for row_n in range(x+1,9):
for col_n in range(0,9):
if self.b[row_n][col_n] == 0:
return row_n,col_n
return -1,-1 def try_it(self,x,y):
if self.b[x][y] == 0:
for i in range(1,10):
self.t+=1
if self.check(x,y,i):
self.b[x][y]=i
next_x,next_y=self.get_next(x,y)
if next_x == -1: #
return True #
else:
end=self.try_it(next_x,next_y)
if not end: #
self.b[x][y] = 0 #
else:
return True
def start(self):
begin = datetime.datetime.now()
if self.b[0][0] == 0:
self.try_it(0,0)
else:
x,y=self.get_next(0,0)
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最后于 2021-5-18 11:05
被kanxue编辑
，原因：
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