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IOT
[18007] 2021-05-11_2021津杯Writeup(详细版)
文档创建者:
s7ckTeam
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2025-01-18
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2021-05-11_2021津杯Writeup(详细版)
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]
=
z
.
v
a
l
u
e
r
e
t
u
r
n
w
d
e
f
d
e
c
i
p
h
e
r
(
v
,
k
)
:
y
=
c
_
u
i
n
t
3
2
(
v
[
0
]
)
z
=
c
_
u
i
n
t
3
2
(
v
[
1
]
)
s
u
m
=
c
_
u
i
n
t
3
2
(
0
x
c
6
e
f
3
7
2
0
)
d
e
l
t
a
=
0
x
9
e
3
7
7
9
b
9
2
、
e
a
s
y
R
e
算
法
:
枚
举
s
e
e
d
,
得
到
s
e
e
d
为
1
5
1
d
e
l
t
a
=
0
x
9
e
3
7
7
9
b
9
n
=
3
2
w
=
[
0
,
0
]
w
h
i
l
e
(
n
>
0
)
:
z
.
v
a
l
u
e
-
=
(
y
.
v
a
l
u
e
<
<
4
)
+
k
[
2
]
^
y
.
v
a
l
u
e
+
s
u
m
.
v
a
l
u
e
^
(
y
.
v
a
l
u
e
>
>
5
)
+
k
[
3
]
y
.
v
a
l
u
e
-
=
(
z
.
v
a
l
u
e
<
<
4
)
+
k
[
0
]
^
z
.
v
a
l
u
e
+
s
u
m
.
v
a
l
u
e
^
(
z
.
v
a
l
u
e
>
>
5
)
+
k
[
1
]
s
u
m
.
v
a
l
u
e
-
=
d
e
l
t
a
n
-
=
1
w
[
0
]
=
y
.
v
a
l
u
e
w
[
1
]
=
z
.
v
a
l
u
e
r
e
t
u
r
n
w
d
e
f
g
e
t
_
d
e
c
(
v
)
:
k
e
y
=
[
0
x
1
1
]
*
4
s
=
d
e
c
i
p
h
e
r
(
v
,
k
e
y
)
r
e
s
=
'
'
f
o
r
i
i
n
s
:
r
e
s
+
=
p
3
2
(
i
)
[
:
:
-
1
]
.
e
n
c
o
d
e
(
'
h
e
x
'
)
.
u
p
p
e
r
(
)
r
e
t
u
r
n
r
e
s
i
f
_
_
n
a
m
e
_
_
=
=
"
_
_
m
a
i
n
_
_
"
:
#
v
=
[
0
x
7
9
A
E
1
A
3
B
,
0
x
5
9
6
0
8
0
D
3
]
p
r
i
n
t
(
g
e
t
_
d
e
c
(
[
0
x
7
9
A
E
1
A
3
B
,
0
x
5
9
6
0
8
0
D
3
]
)
)
p
r
i
n
t
(
g
e
t
_
d
e
c
(
[
0
x
8
0
E
0
3
E
8
0
,
0
x
8
4
6
C
8
D
7
3
]
)
)
p
r
i
n
t
(
g
e
t
_
d
e
c
(
[
0
x
2
1
A
0
1
C
F
7
,
0
x
C
7
C
A
C
A
3
2
]
)
)
p
r
i
n
t
(
g
e
t
_
d
e
c
(
[
0
x
4
5
F
9
A
C
1
4
,
0
x
C
5
F
5
F
2
2
F
]
)
)
s
e
e
d
=
~
(
5
3
*
(
2
*
f
[
6
]
+
f
[
1
5
]
+
3
*
f
[
2
9
]
)
)
&
0
x
F
F
F
f
o
r
i
i
n
r
a
n
g
e
(
3
3
)
:
s
[
i
]
=
(
0
x
1
E
D
0
6
7
5
*
s
e
e
d
+
0
x
6
C
1
)
%
0
x
F
E
s
e
e
d
=
s
[
i
]
f
o
r
i
i
n
r
a
n
g
e
(
3
2
)
:
f
o
r
j
i
n
r
a
n
g
e
(
3
3
)
:
o
u
t
p
u
t
[
i
+
j
]
=
(
o
u
t
p
u
t
[
i
+
j
]
+
(
f
[
i
]
^
s
[
j
]
)
)
^
5
9
7
7
6
5
4
s
e
e
d
=
1
5
1
m
a
g
i
c
=
5
9
7
7
6
5
4
s
=
[
]
f
o
r
i
i
n
r
a
n
g
e
(
3
3
)
:
t
m
p
=
(
0
x
1
E
D
0
6
7
5
*
s
e
e
d
+
0
x
6
C
1
)
%
0
x
F
E
s
.
a
p
p
e
n
d
(
t
m
p
)
s
e
e
d
=
t
m
p
f
l
a
g
=
[
0
f
o
r
i
i
n
r
a
n
g
e
(
3
2
)
]
f
l
a
g
[
0
]
=
o
u
t
p
u
t
[
0
]
^
m
a
g
i
c
^
s
[
0
]
f
o
r
k
i
n
r
a
n
g
e
(
1
,
3
2
)
:
0
x
0
3
C
r
y
p
t
o
1
、
混
合
编
码
c
i
p
h
e
r
t
e
x
t
,
t
a
g
=
e
n
c
r
y
p
t
(
"
I
_
a
m
_
a
d
m
i
n
_
p
l
z
_
g
i
v
e
_
m
e
_
t
h
e
_
f
l
a
g
"
,
"
F
r
o
m
u
s
e
r
"
)
想
要
g
e
t
f
l
a
g
,
唯
的
区
别
是
a
s
s
o
c
i
a
t
e
_
d
a
t
a
导
致
的
A
u
t
h
不
同
,
A
u
t
h
=
p
m
a
c
(
a
s
s
o
c
i
a
t
e
_
d
a
t
a
)
只
要
能
构
造
n
e
w
_
t
a
g
=
t
a
g
^
p
m
a
c
(
"
F
r
o
m
u
s
e
r
"
)
^
p
m
a
c
(
"
F
r
o
m
a
d
m
i
n
"
)
就
f
o
r
k
i
n
r
a
n
g
e
(
1
,
3
2
)
:
l
a
s
t
=
0
f
o
r
i
i
n
r
a
n
g
e
(
l
e
n
(
b
b
b
[
k
]
)
-
1
)
:
l
a
s
t
=
(
l
a
s
t
+
(
f
l
a
g
[
b
b
b
[
k
]
[
i
]
[
0
]
]
^
s
[
b
b
b
[
k
]
[
i
]
[
1
]
]
)
)
^
m
a
g
i
c
f
l
a
g
[
k
]
=
(
(
o
u
t
p
u
t
[
k
]
^
m
a
g
i
c
)
-
l
a
s
t
)
^
s
[
b
b
b
[
k
]
[
-
1
]
[
1
]
]
f
o
r
i
i
n
f
l
a
g
[
:
3
2
]
:
p
r
i
n
t
(
c
h
r
(
i
&
0
x
f
f
)
,
e
n
d
=
'
'
)
i
m
p
o
r
t
b
a
s
e
6
4
s
=
(
b
a
s
e
6
4
.
b
6
4
d
e
c
o
d
e
(
'
J
T
J
G
M
T
A
y
J
T
J
G
M
T
A
4
J
T
J
G
O
T
c
l
M
k
Y
x
M
D
M
l
M
k
Y
x
M
j
M
l
M
k
Y
x
M
T
M
l
M
k
Y
0
O
S
U
y
R
j
E
y
M
C
U
y
R
j
c
1
J
T
J
G
M
T
E
y
J
T
J
G
M
T
A
5
J
T
J
G
N
T
Y
l
M
k
Y
x
M
T
g
l
M
k
Y
3
M
y
U
y
R
j
c
2
J
T
J
G
O
D
c
l
M
k
Y
x
M
T
Q
l
M
k
Y
x
M
D
c
l
M
k
Y
x
M
D
k
l
M
k
Y
4
O
C
U
y
R
j
E
y
M
C
U
y
R
j
g
2
J
T
J
G
N
T
Q
l
M
k
Y
x
M
D
Y
l
M
k
Y
0
O
S
U
y
R
j
Q
5
J
T
J
G
N
z
c
l
M
k
Y
x
M
D
A
l
M
k
Y
5
O
S
U
y
R
j
c
x
J
T
J
G
M
T
E
2
J
T
J
G
N
z
Y
l
M
k
Y
x
M
j
I
l
M
k
Y
x
M
T
g
l
M
k
Y
4
M
i
U
y
R
j
E
y
M
S
U
y
R
j
g
2
J
T
J
G
M
T
I
1
'
)
)
p
r
i
n
t
(
'
'
.
j
o
i
n
(
m
a
p
(
l
a
m
b
d
a
x
:
c
h
r
(
i
n
t
(
x
)
)
,
s
.
s
p
l
i
t
(
b
'
%
2
F
'
)
[
1
:
]
)
)
)
d
e
f
p
m
a
c
(
d
a
t
a
)
:
o
f
f
s
e
t
=
a
e
s
.
e
n
c
r
y
p
t
(
b
"
x
0
0
"
*
1
6
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
2
(
o
f
f
s
e
t
)
d
a
t
a
+
=
l
o
n
g
_
t
o
_
b
y
t
e
s
(
i
n
t
(
'
1
0
0
0
0
.
.
.
0
0
'
,
2
)
)
#
补
到
1
6
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
n
o
n
c
e
可
以
复
需
要
能
够
对
于
任
意
的
m
s
g
,
可
以
得
到
a
e
s
.
e
n
c
r
y
p
t
(
m
s
g
)
,
实
现
任
意
明
加
密
需
要
知
道
Δ
,
为
此
考
虑
:
m
1
=
l
e
n
,
可
以
得
到
c
1
=
m
1
^
a
e
s
.
e
n
c
r
y
p
t
(
l
e
n
^
Δ
)
m
1
=
l
e
n
,
m
2
=
b
"
x
0
0
"
*
1
6
,
可
以
得
到
c
1
'
=
Δ
^
a
e
s
.
e
n
c
r
y
p
t
(
l
e
n
^
Δ
)
因
此
Δ
=
c
1
'
^
l
e
n
^
c
1
有
了
Δ
后
,
构
造
m
1
=
m
s
g
^
Δ
,
可
以
得
到
c
1
=
Δ
^
a
e
s
.
e
n
c
r
y
p
t
(
m
s
g
)
,
即
a
e
s
.
e
n
c
r
y
p
t
(
m
s
g
)
=
c
1
^
Δ
,
实
现
任
意
明
加
密
回
到
p
m
a
c
中
,
对
b
"
x
0
0
"
*
1
6
加
密
,
以
及
对
f
i
n
a
l
_
x
o
r
加
密
即
可
得
到
“
F
r
o
m
a
d
m
i
n
"
和
"
F
r
o
m
u
s
e
r
"
的
A
u
t
h
,
进
计
算
出
相
应
的
t
a
g
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
f
i
n
a
l
_
x
o
r
=
x
o
r
(
o
f
f
s
e
t
,
d
a
t
a
)
r
e
t
u
r
n
a
e
s
.
e
n
c
r
y
p
t
(
f
i
n
a
l
_
x
o
r
)
d
e
f
p
m
a
c
(
d
a
t
a
)
:
o
f
f
s
e
t
=
a
e
s
.
e
n
c
r
y
p
t
(
b
"
x
0
0
"
*
1
6
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
2
(
o
f
f
s
e
t
)
d
a
t
a
+
=
l
o
n
g
_
t
o
_
b
y
t
e
s
(
i
n
t
(
'
1
0
0
0
0
.
.
.
0
0
'
,
2
)
)
#
补
到
1
6
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
o
f
f
s
e
t
=
t
i
m
e
s
3
(
o
f
f
s
e
t
)
f
i
n
a
l
_
x
o
r
=
x
o
r
(
o
f
f
s
e
t
,
d
a
t
a
)
r
e
t
u
r
n
a
e
s
.
e
n
c
r
y
p
t
(
f
i
n
a
l
_
x
o
r
)
i
m
p
o
r
t
m
a
t
h
f
r
o
m
h
a
s
h
l
i
b
i
m
p
o
r
t
s
h
a
2
5
6
f
r
o
m
i
t
e
r
t
o
o
l
s
i
m
p
o
r
t
p
r
o
d
u
c
t
f
r
o
m
p
w
n
i
m
p
o
r
t
*
#
c
o
n
t
e
x
t
.
l
o
g
_
l
e
v
e
l
=
'
d
e
b
u
g
'
c
o
n
n
=
r
e
m
o
t
e
(
"
1
2
2
.
1
1
2
.
1
9
9
.
2
4
"
,
9
9
9
9
)
#
c
o
n
n
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