• Aug 12, 2019  Minimal TOTP generator in 20 lines of Python. Contribute to susam/mintotp development by creating an account on GitHub. Enter any account name and 'Time-based' and enter the above key. Set the dropdown menu to 'Time-based' and tap the 'Add' button.
  • Jun 18, 2018  How Time-based One-Time Passwords work and why you should use them in your app. Photo by William Iven on Unsplash. With the increase in cyber security threats, it has become more and more necessary to upgrade the security standards of your web applications. You need to make sure your users’ accounts are safe.
  • (Python) Generate Encryption Key. Discusses symmetric encryption key generation techniques for block encryption algorithms such as AES, Blowfish, and Twofish, or for other algorithms such as ChaCha20.

Python Generator End

TOTP Generation base on time and user identification

Time-based One-time Password Algorithm which computes a one-time password from shared key(in our case, the user id) and a DateTime.

TOTP is an example of a hash-based message authentication code (HMAC). It combines a secret key with the current timestamp using a cryptographic hash function to generate a one-time password. The timestamp typically increases in 30-second intervals, so passwords generated close together in time from the same secret key will be equal.

TOTP is based on HOTP with a timestamp replacing the incrementing counter.

Jan 15, 2020 PyOTP is a Python library for generating and verifying one-time passwords. It can be used to implement two-factor (2FA) or multi-factor (MFA) authentication methods in web applications and in other systems that require users to log in. Most pythonic way to generate a URL safe unique key or token is to use secrets module. Use secrets.tokenurlsafe it will return a secure random URL-safe text string. The secrets module uses synchronization methods to ensure that no two processes can obtain the same data at the same time.

It has been adopted as Internet Engineering Task Force standard RFC 6238.(RFC 4226 for HOTP)

For more information please visit:Wikipedia: http://en.wikipedia.org/wiki/Time-based_One-time_Password_AlgorithmRFC: http://tools.ietf.org/html/rfc6238

Requirements

  • Microsoft .NET Framework 4.0

Usage

Python Code Generator

// TOTP algorithm uses HOTP

// Call TOTP service

string otp = _totp.GenerateOtp(keyBytes, dateTime);

// Call generate password service

var password GeneratePassword(userId, dateTime)

Semakan Keputusan Time Based Dga32

Source Code

Source code can be find on GITHUB:

Keputusan Time Based Dga32

About

.NET Library using C# programming language. It implements a clear form of TOTP algorithm.It includes a console application in oder to do a quick password generation using TOTP algorithm.The project is formed by small, clear and concise steps. The code is unit tested and helps you understandthe TOTP algorithm strategy.

The one-time pad (OTP) encryption technique is the only proven unbreakable encryption system.
Even infinite computational power and time cannot break this system.
Implementation of the one-time pad system
This tool allows you to enter a message in any language, e.g.: English, Chinese, Russian etc.
All texts are considered UTF-8 encoded.
UTF-8 is a multibyte encoding that can represent any Unicode character in 1 to 4 bytes.
  • ASCII characters (U+0000 to U+007F) take 1 byte
  • Code points U+0080 to U+07FF take 2 bytes
  • Code points U+0800 to U+FFFF take 3 bytes
  • Code points U+10000 to U+10FFFF take 4 bytes
The message Operation start at 10:00 consists of 24 ASCII characters, thus total 24 bytes.
Each character in the message will be converted into a hexadecimal value, for example:
4f7065726174696f6e2073746172742061742031303a3030
To encrypt the message you need a randomly generated number called a one-time pad, for example:
a33a986b3f8b111dfbfb1d2e6f0934748fba6efc07a9fab9
XOR the message and one-time pad to create the cipher :
To decrypt the cipher, XOR the cipher and the same one-time pad: Convert the message hexadecimal value to UTF-8 and you get:
Operation start at 10:00
How to use the one-time pad system
  1. Bob and Alice wants to exchange multiple messages secretly using the one-time pad system.
  2. Bob generates a list of one-time pads, each one-time pad contains a prefix reference number.
  3. Bob stores the list on two USB flash drives.
  4. Bob and Alice meet each other in a restaurant and Bob hand over one of the USB flash drives.
  5. At home Bob creates a message and encrypts it with a one-time pad from the list.
    The encrypted message (cipher), also contains a prefix referring to the one-time pad used.
  6. After encryption Bob deletes the used one-time pad from his list.
  7. Bob sends the cipher to Alice using his email.
  8. Alice receives the cipher. She looks at the cipher prefixed number and knows which one-time pad she must use to decrypt the cipher.
  9. Alice decypts the cipher using the one-time pad from her list.
  10. After Alice has decrypted the message, she deletes the used one-time pad from her list.
The one-time pad system can not be cracked if the folowing rules are applied correctly:
  • The one-time pad should be a randomly generated key.
  • The one-time pad should only be used once.
  • Only the sender and receiver should have copies of the on-time pad. If more parties have a copy, the chance will increase an attacker get hold of a copy.
  • The one-time pads must be exchanged via a secure channel, preferably meeting face to face and the data stored on a USB flash drive.
  • The one-time pad is at least as long as the message that must be encrypted.
Generate one-time pad
This tool also allows you to generate multiple pseudorandom one-time pads. It is called pseudorandom because the generated numbers are not true random numbers but are generated using a mathematical formula. This PRNG (PseudoRandom Number Generator) produces a sequence of bits that 'appears' to be random, i.e., the output is statistically indistinguishable from random values.
This tool uses two methods to generate cryptographic pseudorandom numbers depending if your browser supports it.
  • The first method is using your browser WebCryptoAPI:
  • If your browser does not support the WebCryptoAPI it uses the Stanford Javascript Crypto Library (SJCL) to generate pseudorandom numbers.

One-time pad encoder/decoder and key generator input:



One-time pad encoder/decoder and key generator output: