加密算法随机替换一些字母答案

【问题标题】：Encryption algorithm randomly replaces some letters加密算法随机替换一些字母
【发布时间】：2018-11-03 15:27:30
【问题描述】：

我有以下 python 代码：

file = open("encryption.txt","r")

str1 = file.read()

file.close
charList = []
for char in str1:
    charList.append(char)

bits = []
ascList = []
for i in range(len(charList)):
    ascList.append(ord(charList[i]))
    ascList[i] = "{0:08b}".format(ascList[i])
    currentAsc = ascList[i]
    currentStr = str(currentAsc)
    for x in range(len(currentStr)):

        currentChar = currentStr[x]
        bits.append(int(currentChar))

keyChar = input("enter the character that should act as the key: ")
keyAsc = "{0:08b}".format(ord(keyChar))
keyStr = str(keyAsc)
keyBits = []
for x in range(len(keyStr)):
    keyBits.append(int(keyStr[x]))


key = []
while len(key) != len(bits):

    for i in range(len(keyBits)):
        key.append(keyBits[i])


resultBits = []
for i in range(len(bits)):
    if key[i] != bits[i]:
        resultBits.append("1")
    else:
        resultBits.append("0")

resultSplitInt = []
resultInt = ''.join(resultBits)
for i in range(0,len(resultInt), 8):
    resultSplitInt.append(resultInt[i:i+8])

resultSplit = []
for i in range(len(resultSplitInt)):
    resultSplit.append(chr(int(resultSplitInt[i],2)))

result = ''.join(resultSplit)

file = open("encryption.txt","w")
print(str1)
print("--------------------")
print(result)
file.write(result)
print("done")
file.close()

运行一次程序应该会根据密钥改变“encryption.txt”的内容，再次运行程序应该会将内容恢复到原来的形式。

但是，当我实际运行代码时，一些字母被换掉了。

例如：如果内容是“hello world” 我使用键“a” 运行代码两次后，我留下了“hekko workd”

为什么会发生这种情况，我该如何解决？

附言我知道这既不是一种安全的加密算法，也不是我的代码非常有效。我是 python 新手，并认为这将是一个有趣的任务。我已经走到了这一步，但找不到任何不工作的原因

【问题讨论】：

我无法重现；我得到“A”作为输出。但也许问题在于您没有正确关闭文件：file.close 应该是 file.close()。
@Aran-Fey 你必须运行两次才能将文件转换回来

标签： python-3.x encryption

【解决方案1】：

由于您在 ASCII 范围之外操作，您应该在binary mode 中打开文件：open("encryption.txt","rb") 和open("encryption.txt","wb")

但是，在二进制模式下，您会从文件中获取字节数组，而不是字符串：

file = open("encryption.txt","rb")

str1 = file.read()

file.close()
charList = []
for char in str1:
    charList.append(char)

bits = []
ascList = []
for i in range(len(charList)):
    ascList.append(charList[i])
    ascList[i] = "{0:08b}".format(ascList[i])
    currentAsc = ascList[i]
    currentStr = str(currentAsc)
    for x in range(len(currentStr)):

        currentChar = currentStr[x]
        bits.append(int(currentChar))

keyChar = input("enter the character that should act as the key: ")
keyAsc = "{0:08b}".format(ord(keyChar))
keyStr = str(keyAsc)
keyBits = []
for x in range(len(keyStr)):
    keyBits.append(int(keyStr[x]))


key = []
while len(key) != len(bits):

    for i in range(len(keyBits)):
        key.append(keyBits[i])


resultBits = []
for i in range(len(bits)):
    if key[i] != bits[i]:
        resultBits.append("1")
    else:
        resultBits.append("0")

resultSplitInt = []
resultInt = ''.join(resultBits)
for i in range(0,len(resultInt), 8):
    resultSplitInt.append(resultInt[i:i+8])

resultSplit = []
for i in range(len(resultSplitInt)):
    resultSplit.append(chr(int(resultSplitInt[i],2)))

result = ''.join(resultSplit)

file = open("encryption.txt","wb")
print(str1)
print("--------------------")
print(result)
file.write(result.encode())
print("done")
file.close()

【讨论】：

谢谢，这解决了问题

【解决方案2】：

关闭文件；

file = open("encryption.txt","r")

str1 = file.read()

file.close()

然后就可以了。

顺便说一句，至少使用'a'='A'

【讨论】：