标签:rand append 输出流 import bit cipher tool 转换 bsp
若喜欢,欢迎点右下角"推举"
import math from functools import reduce #用于合并字符 from os import urandom #系统随机的字符 import binascii #二进制和ASCII之间转换 #=========================================== def Mod_1(x,n): ‘‘‘取模负1的算法:计算x2= x^-1 (mod n)的值, r = gcd(a, b) = ia + jb, x与n是互素数‘‘‘ x0 = x y0 = n x1 = 0 y1 = 1 x2 = 1 y2 = 0 while n != 0: q = x // n (x, n) = (n, x % n) (x1, x2) = ((x2 - (q * x1)), x1) (y1, y2) = ((y2 - (q * y1)), y1) if x2 < 0: x2 += y0 if y2 < 0: y2 += x0 return x2 #=========================================== def Fast_Mod(a,p,m): ‘‘‘快速取模指数算法:计算 (a ^ p) % m 的值,可用pow()代替‘‘‘ a,p,m=int(a),int(p),int(m) if (p == 0) : return 1 r = a % m k = 1 while (p > 1): if ((p & 1)!=0): k = (k * r) % m r = (r * r) % m p >>= 1 return (r * k) % m #=========================================== def randint(n): ‘‘‘random是伪随机数,需要更高安全的随机数产生, 所以使用os.urandom()或者SystmeRandom模块, 生成n字节的随机数(8位/字节),返回16进制转为10进制整数返回‘‘‘ randomdata = urandom(n) return int(binascii.hexlify(randomdata),16) #=========================================== def primality_testing_1(n): ‘‘‘测试一,小素数测试,用100以内的小素数检测随机数x, 可以很大概率排除不是素数,#创建有25个素数的元组‘‘‘ Sushubiao=(2,3,5,7,11,13,17,19,23,29,31,37,41 ,43,47,53,59,61,67,71,73,79,83,89,97) for y in Sushubiao: if n%y==0: return False return True #=========================================== def primality_testing_2(n, k): ‘‘‘测试二,用miller_rabin算法对n进行k次检测‘‘‘ if n < 2: return False d = n - 1 r = 0 while not (d & 1): r += 1 d >>= 1 for _ in range(k): a = randint(120) #随机数 x = pow(a, d, n) if x == 1 or x == n - 1: continue for _ in range(r - 1): x = pow(x, 2, n) if x == 1: return False if x == n - 1: break else: return False return True #=========================================== def getprime(byte): while True : n=randint(byte) if primality_testing_1(n) : if primality_testing_2(n, 10) : pass else :continue else : continue return n #=========================================== def RSA(): p=getprime(128) #1024bit的大整数 q=getprime(128) while p==q: #避免p/q值相同 q=getprime(128) n=p*q #n值公开 OrLa=(p-1)*(q-1) #欧拉函数 e=524289 ‘‘‘e的选择:e的二进制表示中应当含有尽量少量的1. e取e=524289时,其二进制为10000000000000000001, 只有两个1,加密速度快且数字大‘‘‘ d=Mod_1(e,OrLa) print(‘公钥为({0},{1});\n私钥为({2},{3})‘.format(n,e,n,d)) message=input(‘请输入任意需要加密的内容:‘) #从标准输入输出流接收数据,数字化再加解密 message=list(map(ord,message)) print(‘ciphertext数字化:‘,message) ciphertext=[] for x in message: ciphertext.append(pow(x,e,n)) print(‘ciphertext加密:‘,ciphertext) message=[] while True : message.append(int(input(‘输入密文组\n(需要结束时输入0):‘))) if message[-1]==0: del message[-1] break plaintext=[] for x in message: plaintext.append(pow(x,d,n)) print(‘plaintext解密:‘,plaintext) plaintext=list(map(chr,plaintext)) print(‘plaintext字符化:‘,plaintext) print(‘plaintext=‘,reduce((lambda x,y: x+y),plaintext)) #=================================================== RSA()
标签:rand append 输出流 import bit cipher tool 转换 bsp
原文地址:http://www.cnblogs.com/5Cwen/p/6139793.html