> KeeLoq is a proprietary hardware-dedicated block cipher that uses a non-linear feedback shift register (NLFSR).
Pretty much any proprietary encryption algorithm is going to qualify as "rolling your own".
"Not the most modern" is a gross understatement.
I can forgive the original authors since it dates to the 1980s and AES wasn't standardized until 2001. (Only just barely though given that DES dates to 1977.) I can't forgive vehicle manufacturers that are _still_ using it (or things significantly like it) 25 years later.
I hope that products manufactured post 2005 use strong publicly available cryptography. After 2010 I fully expect it. After 2015 I view any failure in that regard as gross negligence that ought to be legally actionable.
> it's just fundamentally possible to pair a key with physical access which is easy to get.
I don't follow?
It came out of a university and was acquired.
> I hope that products manufactured post 2005 use strong publicly available cryptography.
A lot of the challenges are related to key pairing and relaying of wireless information in combating with jamming. It’s a tricky thing to secure given the circumstances.
> I don't follow?
Cars stand around 99% of the time and easy to get into. pairing protocols assume that physical access is restricted / not possible. That’s why it’s so much harder to secure car key pairing. What would make it more secure is delegating the security to a remote service which is secured. Eg: what Tesla does with their keys.
