Скачать или смотреть What is TOTP (Time-based One Time Passwords)?

TOTP
Randomness
RNGs
PRNGs
Seeded PRNGs
Hash Functions
What are they / Where are they used?
Important to keep in mind that there are crytpographic and non-cryptographic hash functions
TOTP combines Seeded PRNGs and Cryptographic Hash Functions to generate predictable, "random" codes using a seed and the current time.
As long as your device has the correct time, you can generate the correct code
This seed is present on your device (usually loaded through a QR code) and on the server.
When you log in, the server knows what the code should be (based on current time), so it can confirm that you have the right code


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