密码学课程设计

这次设计的代码只实现：

1.对称加密密钥的安全传输

2.对称加密

3.非对称加密

4.交互界面

对称加密采用DES，非对称加密采用RSA

其中RSA实现DES密钥的加密传输，DES实现信息的加密传输（因为效率高）

代码如下：

import rsa
from tkinter import *
import tkinter.messagebox
import tkinter as tk
from pyDes import des, CBC, PAD_PKCS5
import binascii
import numpy as np
from PIL import Image
from PIL import ImageTk

# DES密钥
with open('key.txt','r') as f:
    KEY = f.read()
key = rsa.newkeys(1024)  # 生成随机密钥
privateKeyB = key[1]  # B的私钥
publicKeyB = key[0]  # B的公钥

def des_encrypt(s):
    """
    DES 加密
    :param s: 原始字符串
    :return: 加密后字符串，16进制
    """
    secret_key = KEY
    iv = secret_key
    k = des(secret_key, CBC, iv, pad=None, padmode=PAD_PKCS5)
    en = k.encrypt(s, padmode=PAD_PKCS5)
    return binascii.b2a_hex(en)


def des_descrypt(s):
    """
    DES 解密
    :param s: 加密后的字符串，16进制
    :return:  解密后的字符串
    """
    secret_key = KEY
    iv = secret_key
    k = des(secret_key, CBC, iv, pad=None, padmode=PAD_PKCS5)
    de = k.decrypt(binascii.a2b_hex(s), padmode=PAD_PKCS5)
    return de

def main1():
    # RSA加解密
    # 公钥加密
    message = KEY
    print('加密的DES的秘钥：', message)
    message = message.encode()
    global cryptedMessage
    cryptedMessage = rsa.encrypt(message, publicKeyB)
    print("加密后的对称密钥的bytes形式：",cryptedMessage)
    with open("miku.txt", "w") as f:
        f.write(cryptedMessage.hex())
    print('加密后的对称密钥的十六进制形式：', cryptedMessage.hex())
    txt1.insert(END, 'DES加密后结果: ')
    txt1.insert(END, '
')
    txt1.insert(END, cryptedMessage.hex())
    txt1.insert(END, '
' + '
' + '
')
    txt1.update()

    #发送的密文
    with open('bbb.txt','r') as f:
        s=f.read()
    print("
")
    enc = des_encrypt(s)
    print ("DES加密后的密文：")
    print(enc)
    enc1 = str(enc, encoding="utf8")
    with open('aaa.txt','w') as f:
        f.write(enc1)
    txt1.insert(END, 'Alice发送的密文: ')
    txt1.insert(END, '
')
    txt1.insert(END, enc1)
    txt1.insert(END, '
'+'
'+'
')
    txt1.update()
    tk.messagebox.askokcancel(title='提示', message='Alice传输密文成功
请等待图片加密完成，约20秒左右')

    #图片转二进制
    im = Image.open('QQ.jpg')
    im2 = np.array(im)
    np.save(file="out.npy", arr=im2)
    #加密二进制
    with open('out.npy','rb') as f:
        ai=f.read()
    encc = des_encrypt(ai)
    with open('oout.npy','wb') as f:
        f.write(encc)
    print("DES加密后的图片二进制：")
    print(encc)
    print('
')
    tk.messagebox.askokcancel(title='提示', message='Alice传输图片密文成功')

def main2():
    # RSA加解密
    with open("miku.txt","r") as f:
        meassage1=f.read()
    print("文件中对称密钥的十六进制:",meassage1)
    meassage2=bytes(meassage1,encoding="utf-8")
    print("文件中对称密钥的bytes形式：",meassage2)
    # 私钥解密
    message = rsa.decrypt(cryptedMessage, privateKeyB)
    message = message.decode()
    print('解密后：', message)

    txt2.insert(END, '解密得到DES的秘钥：')
    txt2.insert(END, '
')
    txt2.insert(END, message)
    txt2.insert(END, '
'+'
'+'
')
    txt2.update()


    #发送的密文
    with open('aaa.txt','r') as f:
        s=f.read()
    print(s)
    print("
")
    enc = s
    print ("DES加密后的密文：")
    print(enc)
    des = des_descrypt(enc)
    print ("DES解密后的明文：")
    print(des)
    des1 = str(des, encoding="utf8")
    txt2.insert(END, 'Bob解密的明文: ')
    txt2.insert(END, '
')
    txt2.insert(END, des1)
    txt2.insert(END, '
'+'
'+'
')
    txt2.update()
    print("
")
    tk.messagebox.askokcancel(title='提示', message='Bob接收成功
请等待，正在解密图片')

    #解密图片二进制数组
    with open('oout.npy','rb') as f:
        ss=f.read()
    dess = des_descrypt(ss)
    with open('oout.npy','wb') as f:
        f.write(dess)
    #转为图片
    ai2=np.load('oout.npy')
    print(ai2)
    image = Image.fromarray(ai2)
    image.save('yt.png')
    tk.messagebox.askokcancel(title='提示', message='图片转换成功，即将显示')
    img = Image.open("yt.png")
    img.show()

#TKinter
root = tk.Tk()
root.geometry('600x400')
root.title('密码学实验交互界面')
canvas = tk.Canvas(root, width=1900, height=750, bd=0, highlightthickness=0)
imgpath = 'bg.jpeg'
img = Image.open(imgpath)
photo = ImageTk.PhotoImage(img)

canvas.create_image(700, 500, image=photo)
canvas.pack()


btn1 = Button(root, text='Alice开始加密传输',bg='grey',command=main1,fg='white')
txt1 = Text(root)
txt1.place(relx=0.4, rely=0.1, relwidth=0.5, relheight=0.35)
btn1.place(relx=0.05, rely=0.1, relwidth=0.3, relheight=0.2)

btn2 = Button(root, text='Bob开始解密', bg='grey',command=main2,fg='white')
txt2 = Text(root)
txt2.place(relx=0.4, rely=0.5, relwidth=0.5, relheight=0.35)
btn2.place(relx=0.05, rely=0.5, relwidth=0.3, relheight=0.2)

root.mainloop()

在设计之初没有去实现通信，只是用写入文件、读取文件模拟传输过程，此外图片加密传输是用三维数组的二进制传输的，其实用base64来实现会更加简单

交互界面的话使用了python的tk来实现

实验截图：

最后会显示图片，实验加密的是灰度图，彩色图片应该也能实现加密