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A comment on Insulin Pumps, Decapped Chips and Software Defined Radios. Parent comment

Re:Insulin Pumps, Decapped Chips and Software Defined Radios by joezydeco on Monday April 29, 2019 @06:32PM (#19783229)
Can you be sure it wasn’t a badly implemented form of obsfucatiom?

It certainly slowed down the reverse engineers. If they didn’t get to the object code what would the next step have been? Cryptographic analysis?

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Re:Insulin Pumps, Decapped Chips and Software Defined Radios by stefan_ on Monday April 29, 2019 @06:48PM (#19783341)
5 of the bits were never set in their "obfuscated" variant? If you want to obfuscate CRC16 you would just choose a randomized starting value.
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Re:Insulin Pumps, Decapped Chips and Software Defined Radios by joezydeco on Monday April 29, 2019 @09:30PM (#19784328)
I didn't say it was implemented well. Perhaps they should changing shift operators would quietly change the values without any disturbance to checksum integrity.
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