那些年做过的ctf之加密篇

最近ctf做的比较多,顺便整理一下做个笔记,大概有加密篇、隐写篇、逆向破解和web方向的几篇文章,整理出来之后会陆续发出来。

0x01 Base64


Base64: ZXZhbCgkX1BPU1RbcDRuOV96MV96aDNuOV9qMXVfU2gxX0oxM10pNTU2NJC3ODHHYWJIZ3P4ZWY=

Base64编码要求把3个8位字节(3*8=24)转化为4个6位的字节(4*6=24),之后在6位的前面补两个0,形成8位一个字节的形式。 如果剩下的字符不足3个字节,则用0填充,输出字符使用’=’,因此编码后输出的文本末尾可能会出现1或2个’=’

Base32: Base32和Base64相比只有一个区别就是,用32个字符表示256个ASC字符,也就是说5个ASC字符一组可以生成8个Base字符,反之亦然。

在线编解码:http://base64.xpcha.com/

0x02 希尔密码


希尔密码:密文: 22,09,00,12,03,01,10,03,04,08,01,17 (明文:wjamdbkdeibr

解题思路:使用的矩阵是 1 2 3 4 5 6 7 8 10

原文链接:http://bobao.360.cn/ctf/learning/136.html

百度百科:http://baike.baidu.com/link?url=R6oWhCdKvzlG8hB4hdIdUT1cZPbFOCrpU6lJAkTtdiKodD7eRTbASpd_YVfi4LMl7N8yFyhVNOz5ki6TC7_5eq

0x03 栅栏密码


栅栏密码:把要加密的明文分成N个一组,然后把每组的第1个字连起来,形成一段无规律的话。

密文样例:tn c0afsiwal kes,hwit1r  g,npt  ttessfu}ua u  hmqik e {m,  n huiouosarwCniibecesnren.

解密程序:

[cce]char s[]= “tn c0afsiwal kes,hwit1r  g,npt  ttessfu}ua u  hmqik e {m,  n huiouosarwCniibecesnren.”;  
char t[86]= “”;  
int i,j,k;
k=0;
for (i=0;i<17;i++)   {         for(j=0;j<5;j++)         {                   t[k++]= ch[j*17+i];         }   }   for(i=0;i<85;i++) {     printf("%c",t[i]); }   [/cce]

原文链接:http://blog.csdn.net/shinukami/article/details/45980629

0x04 凯撒密码


凯撒密码:通过把字母移动一定的位数来实现加密和解密。明文中的所有字母都在字母表上向后(或向前)按照一个固定数目进行偏移后被替换成密文。

密文样例:U8Y]:8KdJHTXRI>XU#?!K_ecJH]kJG*bRH7YJH7YSH]*=93dVZ3^S8*$:8″&:9U]RH;g=8Y!U92’=j*$KH]ZSj&[S#!gU#*dK9\.

解题思路:得知是凯撒加密之后,尝试进行127次轮转爆破:

[cce]#!python
lstr=”””U8Y]:8KdJHTXRI>XU#?!K_ecJH]kJG*bRH7YJH7YSH]*=93dVZ3^S8*$:8″&:9U]RH;g=8Y!U92’=j*$KH]ZSj&[S#!gU#*dK9\.”””  
  
for p in range(127):  
    str1 = ”  
    for i in lstr:  
        temp = chr((ord(i)+p)%127)  
        if 32原文链接:http://blog.csdn.net/shinukami/article/details/46369765

0x05 Unicode


密文样例:\u5927\u5bb6\u597d\uff0c\u6211\u662f\u0040\u65e0\u6240\u4e0d\u80fd\u7684\u9b42\u5927\u4eba\uff01\u8bdd\u8bf4\u5fae\u535a\u7c89\u4e1d\u8fc7\

在线解密:tool.chinaz.com/Tools/Unicode.aspx

0x06 brainfuck


类型:

[cce]++++++++++[>+++++++>++++++++++>+++>+<<<<-] >++.>+.+++++++..+++.>++.<<+++++++++++++++. >.+++.——.——–.>+.>.
[/cce]

利用BFVM.exe直接解密

用法 loadtxt 1.txt

在线解密:http://www.splitbrain.org/services/ook

0x07 摩斯密码


密文样例:—  —  .-.  …  .

0x08 jsfuck


密文中 ()[]{}!+

在线解密:

0x09 培根密码


培根所用的密码是一种本质上用二进制数设计的。不过,他没有用通常的0和1来表示,而是采用a和b。

百科:http://baike.baidu.com/link?url=acaeI3babB7MogPQFh98rDAVSwHfPwh-HnEFTb9cx7DZ5Nz4MkMA14H4SDjBNnOdBsJpliNYa1vnfikQGqvA7K

0x0A 猪圈密码又称共济会密码


百度百科:http://baike.baidu.com/link?url=yN39kWG2pGd9XHo3RjeUAbd7xs0QlnJ2uHzCJfxC03V-fJcQUdfcJ-WuGoAkKGFVE0AxFK4-98wa4FtzvxRA0_

0x0B CRC32


密文样例:4D1FAE0B

[cce]#!python
import zlib
def crc32(st):
crc = zlib.crc32(st)
if crc > 0:
return “%x” % (crc)
else:
return “%x” % (~crc ^ 0xffffffff)
[/cce]

原文链接:http://blog.csdn.net/ab748998806/article/details/46382017

对于其他一些未知密文,可尝试到下列几个网站转换试试,看看运气

Comment

评论:赞,期待后续大作~

评论:http://quipqiup.com/

评论:神奇的JOther编码!console就可以执行
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评论:还有WEB,REVERSE,PWN,MISC连载么

评论:@Knight 多谢 已收藏

评论:期待后续

评论:赞

评论:brainfuck我用js实现了编解码。++++++++++++++++++++++++++++++++[>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+>+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<-]>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>.>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.>++++++

评论:希尔密码和栅栏密码没遇到过。
补充几个之前遇到的加密方式:
base32:明文123456密文GEZDGNBVGY======
颜文字js加密:明文alert(“flag”);
密文:゚ω゚ノ= /`m´)ノ ~┻━┻ //*´∇`*/ [‘_’]; o=(゚ー゚) =_=3; c=(゚Θ゚) =(゚ー゚)-(゚ー゚); (゚Д゚) =(゚Θ゚)= (o^_^o)/ (o^_^o);(゚Д゚)={゚Θ゚: ‘_’ ,゚ω゚ノ : ((゚ω゚ノ==3) +’_’) [゚Θ゚] ,゚ー゚ノ :(゚ω゚ノ+ ‘_’)[o^_^o -(゚Θ゚)] ,゚Д゚ノ:((゚ー゚==3) +’_’)[゚ー゚] }; (゚Д゚) [゚Θ゚] =((゚ω゚ノ==3) +’_’) [c language=”^_^o”][/c];(゚Д゚) [‘c’] = ((゚Д゚)+’_’) [ (゚ー゚)+(゚ー゚)-(゚Θ゚) ];(゚Д゚) [‘o’] = ((゚Д゚)+’_’) [゚Θ゚];(゚o゚)=(゚Д゚) [‘c’]+(゚Д゚) [‘o’]+(゚ω゚ノ +’_’)[゚Θ゚]+ ((゚ω゚ノ==3) +’_’) [゚ー゚] + ((゚Д゚) +’_’) [(゚ー゚)+(゚ー゚)]+ ((゚ー゚==3) +’_’) [゚Θ゚]+((゚ー゚==3) +’_’) [(゚ー゚) – (゚Θ゚)]+(゚Д゚) [‘c’]+((゚Д゚)+’_’) [(゚ー゚)+(゚ー゚)]+ (゚Д゚) [‘o’]+((゚ー゚==3) +’_’) [゚Θ゚];(゚Д゚) [‘_’] =(o^_^o) [゚o゚] [゚o゚];(゚ε゚)=((゚ー゚==3) +’_’) [゚Θ゚]+ (゚Д゚) .゚Д゚ノ+((゚Д゚)+’_’) [(゚ー゚) + (゚ー゚)]+((゚ー゚==3) +’_’) [o^_^o -゚Θ゚]+((゚ー゚==3) +’_’) [゚Θ゚]+ (゚ω゚ノ +’_’) [゚Θ゚]; (゚ー゚)+=(゚Θ゚); (゚Д゚)[゚ε゚]=’\\’; (゚Д゚).゚Θ゚ノ=(゚Д゚+ ゚ー゚)[o^_^o -(゚Θ゚)];(o゚ー゚o)=(゚ω゚ノ +’_’)[c language=”^_^o”][/c];(゚Д゚) [゚o゚]=’\”‘;(゚Д゚) [‘_’] ( (゚Д゚) [‘_’] (゚ε゚+(゚Д゚)[゚o゚]+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ ((o^_^o) – (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((o^_^o) +(o^_^o))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (c^_^o)+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) – (゚Θ゚))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((o^_^o) +(o^_^o))+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ ((゚ー゚) + (゚Θ゚))+ (゚ー゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+(゚Θ゚)+ (゚ー゚)+ ((゚ー゚) + (o^_^o))+ (゚Д゚)[゚ε゚]+(゚ー゚)+ ((o^_^o) – (゚Θ゚))+ (゚Д゚)[゚ε゚]+((゚ー゚) + (゚Θ゚))+ (゚Θ゚)+ (゚Д゚)[゚ε゚]+((゚ー゚) + (o^_^o))+ (o^_^o)+ (゚Д゚)[゚o゚]) (゚Θ゚)) (‘_’);

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