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imsi-pseudo
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README: add user-configurable minimum duration

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Oliver Smith 2020-03-31 12:09:57 +02:00
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commit 8c3bd0b43a
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@ -128,3 +128,16 @@ pseudonymized IMSIs on top, but this is out-of-scope for this project. For
reference, one could pre-provision a random "imsi_pseudo_key" with the SIM
card, store it in the pseudo IMSI table in the HLR, and deploy a new encryption
key together with each new pseudo IMSI, attached to the SMS.
### User-configurable minimum duration between IMSI changes
It may be desirable to let users configure their minimum duration between IMSI
changes. This allows people with a high privacy requirement to switch their
pseudonymous IMSI more often, and it allows the IMSI change to happen less
often if it is distracting to the user. The latter depends on the phone's
software, for example:
* A Samsung GT-I9100 Galaxy SII smartphone with Android 4.0.3 displays a
message at the bottom of the screen for about 5 seconds, but the user
interface remains usable.
* A Samsung GT-E1200 feature phone displays a waiting screen for 16 to 17
seconds and is unusable during that time.