南昌大学计算机网络安全实验报告文档格式.docx
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61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,
即将输入的第58位换到第一位,第50位换到第2位,……,依此类推,最后一位是原来的第7位。
L0、R0则是换位输出后的两部分,L0是输出的左32位,R0是右32位,例:
设置换前的输入值为D1D2D3……D64,则经过初始置换后的结果为:
L0=D550……D8;
R0=D57D49...D7。
经过26次迭代运算后,得到L16、R16,将此作为输入,进行逆置换,即得到密文输出。
逆置换正好是初始置的逆运算,例如,第1位经过初始置换后,处于第40位,而通过逆置换,又将第40位换回到第1位,其逆置换规则如下表所示:
40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,
38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,
36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,
34,2,42,10,50,18,5826,33,1,41,9,49,17,57,25,
放大换位表
32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,
12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21,
22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,1,
单纯换位表
16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,
2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25,
在f(Ri,Ki)算法描述图中,S1,S2...S8为选择函数,其功能是把6bit数据变为4bit数据。
下面给出选择函数Si(i=1,2......8)的功能表:
选择函数Si
S1:
14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,
0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,
4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,
15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,
S2:
15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,
3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,
0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,
13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,
S3:
10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,
13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,
1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,
S4:
7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,
13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,
3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,
S5:
2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,
14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,
4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,
11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,
S6:
12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,
10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,
4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,
S7:
4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,
13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,
6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,
S8:
13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,
1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,
2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11,
四、主要仪器设备及耗材
PC机一台
五、实验步骤与结果
1.运行程序
2.加密过程(同时生成密文文档)
3.解密过程(同时生成明文外部文档)
六、实验原代码
//DES算法C++源代码:
#include"
stdafx.h"
DESTest.h"
DESTestDlg.h"
Encrypt.h"
voidCDES:
:
deskey(unsignedcharkey[8],Modemd)
{
registerintii,j,l,m,n;
unsignedcharpc1m[56],pcr[56];
unsignedlongkn[32];
for(j=0;
j<
56;
j++)
{
l=pc1[j];
m=l&
07;
pc1m[j]=(key[l>
>
3]&
bytebit[m])?
1:
0;
}
for(ii=0;
ii<
16;
ii++)
if(md==DECRYPT)
m=(15-ii)<
<
1;
else
m=ii<
n=m+1;
kn[m]=kn[n]=0L;
for(j=0;
28;
{
l=j+totrot[ii];
if(l<
28)
pcr[j]=pc1m[l];
else
pcr[j]=pc1m[l-28];
}
for(j=28;
56)
24;
if(pcr[pc2[j]])
kn[m]|=bigbyte[j];
if(pcr[pc2[j+24]])
kn[n]|=bigbyte[j];
cookey(kn);
return;
}
cookey(registerunsignedlong*raw1)
registerunsignedlong*cook,*raw0;
unsignedlongdough[32];
registerinti;
cook=dough;
for(i=0;
i<
i++,raw1++)
raw0=raw1++;
*cook=(*raw0&
0x00fc0000L)<
6;
*cook|=(*raw0&
0x00000fc0L)<
10;
*cook|=(*raw1&
0x00fc0000L)>
*cook++|=(*raw1&
0x00000fc0L)>
0x0003f000L)<
12;
0x0000003fL)<
0x0003f000L)>
4;
0x0000003fL);
usekey(dough);
usekey(registerunsignedlong*from)
registerunsignedlong*to,*endp;
to=KnL,endp=&
KnL[32];
while(to<
endp)
*to++=*from++;
scrunch(registerunsignedchar*outof,registerunsignedlong*into)
*into=(*outof++&
0xffL)<
*into|=(*outof++&
8;
*into++|=(*outof++&
0xffL);
*into|=(*outof&
unscrun(registerunsignedlong*outof,registerunsignedchar*into)
*into++=(*outof>
24)&
0xffL;
16)&
8)&
*into++=*outof++&
*into=*outof&
desfunc(registerunsignedlong*block,registerunsignedlong*keys)
registerunsignedlongfval,work,right,leftt;
registerintround;
leftt=block[0];
right=block[1];
work=((leftt>
4)^right)&
0x0f0f0f0fL;
right^=work;
leftt^=(work<
4);
16)^right)&
0x0000ffffL;
16);
work=((right>
2)^leftt)&
0x33333333L;
leftt^=work;
right^=(work<
2);
8)^leftt)&
0x00ff00ffL;
8);
right=((right<
1)|((right>
31)&
1L))&
0xffffffffL;
work=(leftt^right)&
0xaaaaaaaaL;
leftt=((leftt<
1)|((leftt>
for(round=0;
round<
round++)
work=(right<
28)|(right>
work^=*keys++;
fval=SP7[work&
0x3fL];
fval|=SP5[(work>
fval|=SP3[(work>
fval|=SP1[(work>
work=right^*keys++;
fval|=SP8[work&
fval|=SP6[(work>
fval|=SP4[(work>
fval|=SP2[(work>
leftt^=fval;
work=(leftt<
28)|(leftt>
work=leftt^*keys++;
right^=fval;
right=(right<
31)|(right>
1);
leftt=(leftt<
31)|(leftt>
8)^right)&
2)^right)&
16)^leftt)&
4)^leftt)&
*block++=right;
*block=leftt;
};
unsignedcharCDES:
Df_Key[24]=
0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67
unsignedshortCDES:
bytebit[8]=
0200,0100,040,020,010,04,02,01
unsignedlongCDES:
bigbyte[24]=
0x800000L,0x400000L,0x200000L,0x100000L,
0x80000L,0x40000L,0x20000L,0x10000L,
0x8000L,0x4000L,0x2000L,0x1000L,
0x800L,0x400L,0x200L,0x100L,
0x80L,0x40L,0x20L,0x10L,
0x8L,0x4L,0x2L,0x1L
pc1[56]=
56,48,40,32,24,16,8,0,57,49,41,33,25,17,
9,1,58,50,42,34,26,18,10,2,59,51,43,35,
62,54,46,38,30,22,14,6,61,53,45,37,29,21,
13,5,60,52,44,36,28,20,12,4,27,19,11,3
totrot[16]=
1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28
pc2[48]=
13,16,10,23,0,4,2,27,14,5,20,9,
22,18,11,3,25,7,15,6,26,19,12,1,
40,51,30,36,46,54,29,39,50,44,32,47,
43,48,38,55,33,52,45,41,49,35,28,31
SP1[64]=
0x01010400L,0x00000000L,0x00010000L,0x01010404L,
0x01010004L,0x00010404L,0x00000004L,0x00010000L,
0x00000400L,0x01010400L,0x01010404L,0x00000400L,
0x01000404L,0x01010004L,0x01000000L,0x00000004L,
0x00000404L,0x01000400L,0x01000400L,0x00010400L,
0x00010400L,0x01010000L,0x01010000L,0x01000404L,
0x00010004L,0x01000004L,0x01000004L,0x00010004L,
0x00000000L,0x00000404L,0x00010404L,0x01000000L,
0x00010000L,0x01010404L,0x00000004L,0x01010000L,
0x01010400L,0x01000000L,0x01000000L,0x00000400L,
0x01010004L,0x00010000L,0x00010400L,0x01000004L,
0x00000400L,0x00000004L,0x01000404L,0x00010404L,
0x01010404L,0x00010004L,0x01010000L,0x01000404L,
0x01000004L,0x00000404L,0x00010404L,0x01010400L,
0x00000404L,0x01000400L,0x01000400L,0x00000000L,
0x00010004L,0x00010400L,0x00000000L,0x01010004L
南昌大学实验报告二
1.熟悉非对称加密算法。
2.掌握私钥和公钥再签名和加密中的应用。
3.了解PGP工具的操作
(1)了解PGP软件;
(2)应用PGP软件,熟悉加密、解密过程.
三、实验基本原理
PGP简介:
PGP,全名:
PrettyGoodPrivacy,也是一个混合型加密体系的称呼。
通常只理解为是PGP公司的系列软件。
能对邮件、文件、文件夹、整个硬盘加密,全网段加密权限和访问权限控制等。
PGP能够提供独立计算机上的信息保护功能,使得这个保密系统更加完备。
它的主要功能是:
数据加密,包括电子邮件、任何储存起来的文件、还有即时通讯(例如ICQ之类)。
数据加密功能让使用者可以保护他们发送的信息,如电子邮件,还有他们储存在计算机上的所有