How to bring down mission-critical GPS networks with $2,500

Re: How to bring down mission-critical GPS networks with $2,500 by Genmutant on Friday December 14, 2012 @02:30PM (#4922778)

@2) Wouldn't it be possible to reverse engineer a military receiver? Or is it a changing passcode that must be input manually?

[ Parent | on HN ]

Re: How to bring down mission-critical GPS networks with $2,500 by gvb on Friday December 14, 2012 @10:12PM (#4924478)

I don't know much about the cryptology they use, but I do know that the keys are time-limited and I'm pretty confident the encryption is strong.

* If you steal a key, it will stop working after a brief time (probably hours to days).

* Knowing the decryption key does not (necessarily) mean you can perform the encryption.

[ Parent | on HN ]

Re: How to bring down mission-critical GPS networks with $2,500 by kevingadd on Friday December 14, 2012 @03:35PM (#4923162)

http://en.wikipedia.org/wiki/Public-key_cryptography

[ Parent | on HN ]

Re: How to bring down mission-critical GPS networks with $2,500 by Genmutant on Friday December 14, 2012 @03:48PM (#4923247)

Yeah, but that doesn't help if you have the device which decrypts the signal. Then you should be able to get the key (which would probably still be fairly difficult).

[ Parent | on HN ]

Re: How to bring down mission-critical GPS networks with $2,500 by ynniv on Friday December 14, 2012 @04:04PM (#4923323)

A receiver/decrypter only contains the public key, which can't be used to encrypt a new message. Perhaps you aren't familiar with asymmetric / public key cryptography?

[ Parent | on HN ]

Re: How to bring down mission-critical GPS networks with $2,500 by vonmoltke on Friday December 14, 2012 @04:09PM (#4923357)

And that is one reason the US military spends so much money and effort on anti-tamper[1] design and technology.

[1] http://www.at.dod.afrl.hpc.mil/

[ Parent | on HN ]