nhscontactapp
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nhscontactapp [2020/05/06 07:12] – created mark | nhscontactapp [2020/05/06 10:22] (current) – [How is the unique ID generated] mark | ||
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The NHS contact tracing app uses Bluetooth Low Energy to transmit a unique ID, this ID is changed at a periodic interval. This topic details questions about how this process works with the intention to find answers. | The NHS contact tracing app uses Bluetooth Low Energy to transmit a unique ID, this ID is changed at a periodic interval. This topic details questions about how this process works with the intention to find answers. | ||
- | How is the unique ID generated | + | ===== How is the unique ID generated |
There are two main options, the first is a seed that is " | There are two main options, the first is a seed that is " | ||
- | How often is the Unique ID changed | + | From https:// |
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+ | It looks like a seed is used. | ||
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+ | "Every day, your device generates a random elliptic curve key pair and encrypts your installation ID (and some other administrative stuff like time periods) with it in a way that only the NHS server can recover, " | ||
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+ | ===== How often is the Unique ID changed | ||
To prevent tracking a user through space, the Unique ID is changed, how often effects the exposure. For example if its changed on every transmission, | To prevent tracking a user through space, the Unique ID is changed, how often effects the exposure. For example if its changed on every transmission, | ||
- | Does | + | ===== Does The contact app exchange values ===== |
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+ | This is a very important question. If the app just records the beacons it sees without performing any additional authentication, | ||
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+ | {{:: | ||
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+ | This attack can be simplified if the attacker has access to a known " |
nhscontactapp.1588749133.txt.gz · Last modified: 2020/05/06 07:12 by mark