oswhe.blogg.se - Online generator activation code

That provides no cryptographic protection against determined adversaries.

I thought of using the ISO 7064 Mod 97,10 formula Let's examine the propositions in the question: However, the output will be too long correct? Besides, this means that the central authority has to have access to public keys of all hardware systems. I can generate the code using the above formula and use RSA with digital certificate. This is just an error detection algorithm. However, this means the same code is not unique to a hardware system. I thought of using the ISO 7064 Mod 97,10 formula to generate codes (in the central authority) and the use the same formula on the hardware to see if it is valid.

Availability of standard libraries to implement this.

To keep things simple at the beginning, we can assume that every code generated will run the hardware for the same amount of time (as opposed to codes which give the time for which the hardware should run).

The code should work for a specific hardware only (unique to each user).

The code has to be short and numeric (7-8 digits).

The user enters this code through the keypad and the system is operational for a certain period of time after which the user has to repeat the process.

To make the hardware operational, the user has to go to central authority and get a code (7-8 digits) in exchange for money.

User has a hardware system (with an unique ID) that does not have.