非常简单的字符串加密

Question

I was wanting to create my own extremely simple encryption for some text in python. Its only to deter people if they find the file i want to encrypt. I have this code below that could do that however it would take forever to code it the way im doing it and im sure its not the most efficient. I was wondering if there is a way to do this using much less code. (a,b,c are not the only charicters i will use btw. Also im fine copying/pasting the random text myself)

def encrypt(text):
    return str(text).replace("a", "3tpkDWCiXw").replace("b", "moOK4LWTUx").replace("c", "qqN9zTb9nR")

def decrypt(text):
    return str(text).replace("3tpkDWCiXw", "a").replace("moOK4LWTUx", "b").replace("qqN9zTb9nR", "c")

encrypted = encrypt("abc")

print(encrypted)

decrypted = decrypt(encrypted)

print(decrypted)

Thanks in advance as it will also help me with other things, not just this small project. PS i just want this to be simple like the example given because i dont want/need more complicated encryption.

Edit: Another reason I'm not using more complicated encryption is because whenever i copy the code and try to do it myself i get an error. Also i did install cryptography but for some reason it didn't work.

Answer 1

Here is Caesar Cipher:

#! /usr/bin/env python

# Caesar Cipher Encryption and Decryption tool.

# Introduction
print('\nHow to use:\n\n')
print('Encrypt:\n')
print('\tEnter your encryption key (1-25)\n')
print('\tThen, enter the message to encrypt.\n\n')

print('Decrypt:\n')
print('\tEnter the decryption key.\n')
print('\tThen, paste the encrypted message.')

print('\n\nEnter "q" or "quit" to exit.\n')

# Every possible symbol that can be encrypted/decrypted:
SYMBOLS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890 !?.~`@#$%^&*)("
message = ''
mode = ''

# User enters the mode
currentMode = input("Mode: [encrypt] or [decrypt]: ")

# ENCRYPT settings
if currentMode == 'e'.lower() or currentMode == 'encrypt'.lower():
    mode = 'encrypt'
    key = int(input('Encryption Key: '))
    while key >= len(SYMBOLS) or key <= 0:
        print('Please enter an encryption key between 1-' + str(len(SYMBOLS) - 1))
        key = int(input('Encryption Key: '))
    message = input('What would you like to encrypt?\n')

# DECRYPT settings
elif currentMode == 'D' or currentMode == 'd' or currentMode == 'decrypt' or currentMode == 'DECRYPT':
    mode = 'decrypt'
    key = int(input('Decryption Key: '))
    while key >= len(SYMBOLS) or key <= 0:
        print('Please enter a decryption key between 1-' + str(len(SYMBOLS) - 1))
        key = int(input('Decryption Key: '))
    message = input('Paste the encrypted text below:\n')

# Quit
elif currentMode == 'Q' or currentMode == 'q' or currentMode == 'quit' or currentMode == 'QUIT':
    exit()

# Store encrypted / decrypted message:
translated = ''

for symbol in message:
    if symbol in SYMBOLS:
        symbolIndex = SYMBOLS.find(symbol)

        # Perform encryption / decryption
        if mode == 'encrypt':
            translatedIndex = symbolIndex + key
        if mode == 'decrypt':
            translatedIndex = symbolIndex - key

        # Handle wraparound if needed:
        if translatedIndex >= len(SYMBOLS):
            translatedIndex = translatedIndex - len(SYMBOLS)
        elif translatedIndex < 0:
            translatedIndex = translatedIndex + len(SYMBOLS)

        translated = translated + SYMBOLS[translatedIndex]
    else:
        # Append the symbol without encrypting / decrypting:
        translated = translated + symbol

# Output text
if mode == 'encrypt':
    print('\nYour ENCRYPTED message:')
elif mode == 'decrypt':
    print('\nThe secret message is:')

# Ciphertext
print('\n\t' + translated + '\n')

You can also check out the Affine or Transposition Cipher which are both fairly simple (but more complex than Caesar Cipher)