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Terence Eden 1y ago πŸ’¬ 1

πŸ†• blog! β€œCan time-travellers use TOTP codes?”

Imagine, just for a moment, you and your friends decide to travel in time. In order to make sure you can authenticate your communications with each other, you set up a shared Time-based One Time Password (TOTP). The TOTP algorithm uses a Hash-based Message Authentication Code (HMAC). The hash is calculated from a shared …

πŸ‘€ Read more: https://shkspr.mobi/blog/2024/07/can-time-travellers-use-totp-codes/

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#ComputerScience #standards #totp

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Carlos 1y ago

It won't work like that because there's no way of guaranteeing that when you arrive at a past date, it will be the same time-space path that took you to the future in the first place. Your version of reality would of changed to whatever the new reality is.

For example, suppose you wrote down a bitcoin block hash for a specific block height. When you go back in time to witness that same block height, the block hash would be different, because the time-space path is different.

I've tried it so I know it's true. It's not just computer algos like TOTP, it's everything. This version of time-space is particularly annoying as a lot of Ed Sheeran lyrics are slightly off. In this instance, Perfect ends with "Darling, you look perfect tonight", but in my previous journey it was "Darling, you look perfect to me".