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Comment Dropcam (Score 1) 272

I'm surprised no one has mentioned Dropcam yet. Cloud based HD video security monitoring using Wi-Fi enabled cameras, which include audio and motion alerts that send directly to email or Android/iPhone devices.

The video quality is just fine if you include a motion activated light, and it's cheap enough to add three or four of them to cover all entrances (including windows.)

For a basic subscription, it will keep 7 days of video monitoring online, as well as sending you alerts.

As a bonus, it lets you talk back to the camera....

Comment GPS receiving (Score 1) 253

Live traffic updates are also one-way. Your GPS system has additional functions which depend either on GSM (as used by GPS-based tracking systems) or simple radio receivers tuned to RBDS services or a Traffic Message Channel (TMC) on FM or DAB.

Functionally, the GPS technology never transmits -- but a device including GPS functionality might also include other technologies to transmit information.

Comment Maths is fun! (Score 1) 570

Just a small note to all those clever people who are calculating the time taken to perform an exhaustive keyspace search on the potential passwords.

We should distinguish between the MAXIMUM time taken to exhaust the symbol space, versus the AVERAGE time.

Assuming uniform distribution of passwords through the space, and a sufficiently large sample of challenges, we would naturally expect the time taken to find the correct password to converge on n/2 -- i.e., half of the maximum time.

Thus, if a symbol space can be exhaustively searched in one year, on average, finding passwords with a similar difficulty level will take an average of 6 months, with a typical normal distribution.

Unix is the worst operating system; except for all others. -- Berry Kercheval