How to Implement Base64(SHA1(NONCE + TIMESTAMP + SHA1(PASSWORD))) in Python 3.8.3 Using Hashlib

Описание: A beginner's guide to hashing and encoding in Python 3.8.3. Learn how to use SHA1 and Base64 with hashlib for secure password storage in web services.
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Introduction

As beginners in programming, we often encounter hurdles while trying to grasp complex concepts, especially when it involves security practices like hashing and encoding. One such scenario is constructing a specific password digest using the combination of a NONCE, TIMESTAMP, and a PASSWORD. The goal here is to execute an algorithm that outputs a digest following the format: Base64(SHA1(NONCE + TIMESTAMP + SHA1(PASSWORD))).

In this guide, we'll break down the problem, clarify the requirements, and then provide a clear solution using Python 3.8.3's hashlib and base64 libraries. So let's dive in!

Understanding the Requirements

To achieve the desired result, we will follow a series of logical steps:

Hash the Password: First, we will hash the plain text password using SHA1.

Create a Concatenated String: Then we will concatenate the NONCE, TIMESTAMP, and the hashed password together into a single string.

Hash That String: Next, we will apply SHA1 to this concatenated string.

Base64 Encode the Final Result: Finally, we will Base64 encode the result of the SHA1 hash.

Let's look at a sample input to clarify the concept:

Plain text password: AMADEUS

Raw Nonce: secretnonce10111

Timestamp: 2015-09-30T14:12:15Z

Following the algorithm outlined in the introduction, we expect to arrive at a correct password digest using these values.

Steps to Implement the Algorithm in Python

To implement this, follow these steps:

1. Import Necessary Libraries

We will need both the hashlib and base64 library for hashing and encoding respectively.

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2. Define Your Variables

Define your nonce, timestamp, and password as follows:

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3. Hash the Password

Use the SHA1 hashing function and ensure that we work with bytes, not strings.

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4. Concatenate Values

Now concatenate the NONCE, TIMESTAMP, and the result of the password hash. Make sure everything is in bytes:

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5. Compute the SHA1 Hash of the Concatenated String

Hash the concatenated byte string:

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6. Base64 Encode the Final SHA1 Hash

Finally, Base64 encode the result:

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Conclusion

By following the steps above, you will achieve a secure password digest that conforms to the required algorithm. Remember, when dealing with cryptographic functions, it's critical to work with byte strings to ensure accuracy.

Feel free to experiment with different variable values and observe how the resulting password digest changes. Happy coding, and welcome to your Pythonic journey!