Generate temporary random password from another qt project

mostefa

Hello guys,

I am working on Qt 4.7.4 project , on embedded device imx6 (card) , i want to generate a temporary password to unlock a login page :

The purpose is that when customers uses the embedded device , if they forgot their password we want to be able to generate random password for them , for a 15 minutes duration,

What i need to do , is to have one other external qt project which will generate a random password , and this password must be able to unlock the login page on the embedded device (only for 15 minutes duration).

I don't know where to start , maybe having a generateTemporaryPassword() function shared between the two project ? but what about the duration ? and how to know the current password ?

Or maybe there is already a mechanism to generate random password for a specific duration ?

Or maybe the idea is to generate a pseudo-random password ?

Can you guide me where to start ?

J.Hilk

@mostefa interesting problem.

The first thing that comes to my mind, would be utilizing Quuid qt 4 only has fromRfc4122(const QByteArray & bytes) to create one from a seed.

you could create each minute a new Uuid based on the current time, hash-map it and each new minute, you check if the login pasword/uuid ist still part of the valid QUuid map.

Technically, it wouldn't be that "random" but still pretty hard to guess, without disassembling.

SGaist

Hi,

Are you thinking of something along the line of Time-based One Time Password ?

mostefa

@SGaist

Thank you for your relevant answer , this what i was looking for , i will try it tomorrow !

@J-Hilk Thank you for your answer too!