30 Jul '16, 6pm

これは凄い記事。我々も使っているGPS信号がSpoofing(ニセ情報)に騙される可能性を技術的に分析。GPSのSpoofingは既にドローンや艦船の位置を惑わし、実害が出ている可能性もあると見られている。 https://t.co/w686QfQXkv

これは凄い記事。我々も使っているGPS信号がSpoofing(ニセ情報)に騙される可能性を技術的に分析。GPSのSpoofingは既にドローンや艦船の位置を惑わし、実害が出ている可能性もあると見られている。 https://t.co/w686QfQXkv

Overall, 31 navigation satellites make up the commonly used GPS network, which is operated by the U.S. Air Force. These satellites actually broadcast two sets of PRN codes: one for civilians and one for the U.S. military. Civilian PRN codes are unencrypted and published in a public database. Military codes are encrypted in the sense that they follow a pattern that is predictable only if the receiver has access to a secret key. Rather than decrypting these codes, this key lets receivers know what the code will be before it even arrives. Although nonmilitary receivers can pick up the military GPS signals, they can’t anticipate them or use them to calculate their location. For security, the Air Force frequently changes the keys of military signals so that only receivers with an updated key can use the newest ones.

Full article: http://spectrum.ieee.org/telecom/security/protecting-gps-...

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