Hacking a VW Golf Power Steering ECU

Re:Hacking a VW Golf Power Steering ECU by markus_zhang on Monday January 03, 2022 @11:10AM (#29782219)

> XOR with very large keys is how critical military encryption systems such as radios work.

Is it that large keys are factors of very large prime numbers so that to know the keys you will need a very powerful computer?

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Re:Hacking a VW Golf Power Steering ECU by chrisseaton on Monday January 03, 2022 @11:14AM (#29782262)

XOR with a one-time pad doesn't work off factors of large numbers - you're thinking of asymmetric encryption there. You literally just XOR each plain text byte with a key byte.

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Re:Hacking a VW Golf Power Steering ECU by markus_zhang on Monday January 03, 2022 @12:08PM (#29783061)

Thanks! I don't know much about cryptography and will check this out.

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Re:Hacking a VW Golf Power Steering ECU by ncmncm on Monday January 03, 2022 @02:07PM (#29784874)

There are only two factors of any prime number, large or otherwise: 1 and the number.

But even correcting to what you must have meant to suggest doesn't make sense.

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Re:Hacking a VW Golf Power Steering ECU by markus_zhang on Monday January 03, 2022 @03:30PM (#29786362)

Sorry I meant something else, can't wrap my head around to recall the name...

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