加密的字符串没有给出与相同字符串相同的值 python

Question

我正在编写一个密码管理器程序，我需要将一个加密的字符串存储在一个文件中。（“服务”变量）当用户需要检索信息时，他们输入与以前相同的字符串。当我加密相同的字符串时，我得到不同的输出。我检查了很多次，字符串是一样的。有人知道解决这个问题的办法吗？

我用来加密和写入文件的代码：

def new_account(service, username, password, filepath, key):
    # Encrypting the account details #
    encrypted_service = key.encrypt(bytes(service, "utf-8"))
    encrypted_username = key.encrypt(bytes(username, "utf-8"))
    encrypted_password = key.encrypt(bytes(password, "utf-8"))

    encrypted_service = encrypted_service.decode("utf-8")
    encrypted_username = encrypted_username.decode("utf-8")
    encrypted_password = encrypted_password.decode("utf-8")

    password_file = open(f"{filepath}\passwords.txt", "a")
    password_file.close()
    password_file = open(f"{filepath}\passwords.txt", "r")
    password_file_content = password_file.read()
    password_file.close()
    password_file = open(f"{filepath}\passwords.txt", "a")

    if f"{encrypted_service},{encrypted_username},{encrypted_password}" in password_file_content:
        password_file.close()
        return("The account already exists.")
    else:
        password_file.write(f"{encrypted_service},{encrypted_username},{encrypted_password}\n")
        password_file.close()
    
    return f"Account saved for {service.title()} with username {username} and password {password}."

我用来检索信息的代码：

# The account retrieval function #
def get_account(service, filepath, key):
    encrypted_service = key.encrypt(bytes(service, "utf-8"))
    encrypted_service = encrypted_service.decode("utf-8")
    password_file = open(f"{filepath}\passwords.txt")
    lines = password_file.read().split("\n")
    word = f"{encrypted_service}"

    # Getting the line with the account details #
    for i in lines:
        index = lines.index(i)
        myline = lines[index]

        encrypted_account_content = myline.split(",")
        print(encrypted_account_content)
        print(f"service is: {encrypted_service}")


        if encrypted_account_content.count(encrypted_service) != 0:    
            # Decrypting the account details #
            username = encrypted_account_content[1]
            decrypted_username = key.decrypt(bytes(username, "utf-8"))
            decrypted_username = decrypted_username.decode("utf-8")
            password = encrypted_account_content[2]
            decrypted_password = key.decrypt(bytes(password, "utf-8"))
            decrypted_password = decrypted_password.decode("utf-8")

            return f"Service: {service.title()}\nUsername: {decrypted_username}\nPassword: {decrypted_password}"
        else:
            return "Account not found. Please try again."

Answer 1

任何适当的加密都会使用随机化，因此结果总是不同的，您将无法判断明文是否相同。这是实现 semantic security. In practice, initialization vectors and modes of operation like CBC or CTR are used. The cryptography library 所需要的，它是开箱即用的（使用 CBC 模式）。

您要么必须将服务存储为明文，这不会显着降低整体安全性，要么解密每个服务字段以找到所需的记录。

加密的字符串没有给出与相同字符串相同的值 python

Encrypted string doesn't give same value as identical string python

python

encryption