python密码学 rc4

Ksher

python实现rc4对汉字的加密：

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import numpy
def init(s,key,len):
	i=0
	j=0
	t=[]
	for i in range(256):
		s.append(i)
		t.append(key[i%len])
	i=0
	for i in range(255):
		j=(j+s[i]+t[i])%256
		tmp=s[i]
		s[i]=s[j]
		s[j]=tmp
	return s
def crypt(plaintext,s,len):
	i=0
	j=0
	s1=[]
	s2=[]
	k=1
	for i in range(len*2):
		n=i
		i=(i+1)%256
		j=(j+s[i])%256
		tmp=s[i]
		s[i]=s[j]
		s[j]=tmp
		t=(s[i]+s[j])%256
		if k%2==0:
			plaintext[int((n-1)/2)]^=m*pow(2,8)+s[t]
			
		else:
			m=s[t]
		k=k+1
	return plaintext
def main():
	key=input('key:')
	plaintext=input('plaintext:')
	ciphertext=[]
	p=[]
	i=j=0
	k=[]
	S=[]
	S1=[]
	s=[]
	c=[]
	for i in range(len(key)):
		k.append(ord(key[i]))
	for j in range(len(plaintext)):
		p.append(ord(plaintext[j]))
	s1=init(S,k,len(key))
	plaint=crypt(p,s1,len(p))
	print('密文:')
	for i in range(len(plaint)):
		ciphertext.append(chr(plaint[i]))
		print(chr(plaint[i]))

	for j in range(len(ciphertext)):
		c.append(ord(ciphertext[j]))
	s2=init(S1,k,len(key))
	test=crypt(c,s2,len(c))
	print('解密：')
	for i in range(len(test)):
		print(chr(test[i]))
if __name__ == '__main__':
	main()

该算法实现了对汉字的加密，而不是单纯的对二进制流的加密

kk1212

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ww7245226

在这顶一个

小黑LLB

很棒 顶帖