Crypto密码

text::Crypto理论

my::部分密码实现

一、古典密码

1 置换加密

1.1 凯撒

2 代换加密

2.1 hill

3 词频分析

词频分析网站

二、现代密码

1 流密码

1.1 A5算法

1.2 RC4算法

# 初始化S
for i = 0 to 255:
    S[i] = i
    T[i] = Key[ i % keylen ]
j = 0

for i =  0 to 255:
	j = (j + S[i] + T[i]) mod 256
	Swap(S[i] , S[j])
    
# 随机序列生成
i,j = 0
while(True):
    i = ( i + 1) mod 256
    j = ( j + S[i] ) mod 256 
    Swap( S[i] , S[j] )
    t = ( S[i] , S[j] ) mod 256
    K = S[t]

2 分组密码

2.1 DES

2.2 AES

3 Hash密码

3.1 Md5

md5碰撞

特点：16或32位，由”a-f”，”0-9”组成（十六进制数）

Discuz密码：一种加盐加密。采用的方式是md5(md5(password).salt)

3.2 Hash-256

一文读懂SHA256算法原理及其实现 - 知乎 (zhihu.com)

Sha256 Algorithm Explained

3.3 NTLM

Windows的哈希密码，标准通讯安全协议。

Windows认证体系—NTLM认证 - 知乎 (zhihu.com)

4 公钥密码

4.1 RSA

常见问题

# 质数p q ... 任取（可以不止两个）
n = p * q * ...
# 求欧拉函数
φ(n) = (p - 1) * (q - 1) * ...
# e为公钥，任取小于φ(n)的数
gcd(e,φ(n)) = 1
# d为私钥
d = e^-1 mod φ(n)
# 加密，c = m ** e % n 
c = pow(m,e,n) 
# 解密，m = c ** d % n
m = pow (c,d,n)

4.2 ECC

三、其他密码

在线密码工具

1 当代编码

1.1 二战诗歌密码

二战诗歌密码加解密

带有关键词的诗歌，如：all，for，die。

2 现代编码

2.1 rabbit

rabbit加解密

特点：头为 U2F。

2.2 Ook

Ook加解密

特点：Ook. Ook? Ook!

2.3 阴阳怪气密码

阴阳怪气密码加解密

特点：不会吧？就这 ¿ 不会吧？就这 ¿ 就这 ¿ 不会吧？

2.4 熊曰佛曰兽语颜文字

熊曰佛曰兽语颜文字加解密

熊曰：呋食動森冬和笨物森嘍嗅嗄呆捕爾噔氏意歡萌麼誒呦沒沒喜取樣沒果肉噔沒麼象眠嗡囑怎爾盜註

新佛曰：諸隸僧降吽諸冥陀摩冥隸僧缽薩嚤伏空願哆蜜吶斯祗咒嚤所冥僧冥諸訶塞囉冥吽莊咒

兽语：~呜嗷啊呜呜~呜呜嗷啊啊啊啊啊嗷嗷呜啊嗷嗷~

颜文字：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)=

2.5 垃圾邮件

垃圾邮件加解密

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