58 karma · joined February 2, 2011
But if the water freezes inside and prevents the actuator from moving, then the lock won't work. the same can happen to the mechanical locks...if the water gets into the key hole and freezes there or freezes up the locking mechansim
I apologize about that. I kind of assume it was clear but thanks for the reminder.
If you want to share bikes, hand-off of keys will be an issue. With BitLock for example you can share 3 bikes between 10 people. with the app on your phone you can geolocate bikes and lock/unlock easily.
Also you can apply the same argument to Lockitron. They can grant access to anyone to open your door lock and I believe you have more valuable stuff at your house.
a final note, the battery innovation does not even have to be that much of a breakthrough. if your phone lives for a couple of days on a single charge, then the probability of running out of battery will decrease dramatically (since most people charge at least once every two days).
As a side note, I have PhD in embedded system security, although most of these things are crypto 101.
The lock just does't pop.
Wheel locks are great don’t work everywhere. People don’t consider them safe. The other problem is that they may not be compatible or fit with all kinds of bikes. You don’t to pay for data plan on BitLock. You just need to have internet on your phone.
Comparing to the locks in the market in terms of structural security we are well above average. We can't beat Kryptonite New Yorker but we are as good as other Kryptonite U-Locks. Note that every lock in the market can be easily compromised with an angle grinder. The amount of extra (structural) security you get per dollar has a diminishing return. For example, a $60 lock is probably six times more secure than a $10 lock, but $100 lock maybe hardly twice as secure as a $60 lock.
In terms of electronic key security (or keying security), there is no way to hack the lock. Everything is encrypted using 128-AES (access control industry standard). Plus we make sure our keys have are completely random and have maximum entropy. On a side note, I have a PhD on embedded system security, so you can probably on this one. We are also going to send BitLocks to a group of hackers in Germany and challenge them to compromise the security of the locks.
A final note, encryption even the lousy ones are way more secure that the mechanical keying systems. Most locks can be picked by professional lock pickers.
Basically, the biggest technical and design challenge was the battery life.
We wanted to make the lock in a way that the user does not have to charge the lock/battery nor has to worry about replacing the battery at least for a couple of years.
To accomplish that, we had to look across all of the components that consume power. On the radio side, bluetooth LE solved that problem for us. Since we are sending data in bursts and the amount of data transferred is so little, the radio power consumption is almost negligible. We also use an ultra low power micro-controller with intelligent power management to low power consumption when the lock is not in use. The biggest power sucker was the mechanical actuation system. So that became more of a mechanical design and engineering problem. Using a solenoid was our of equation. There are extremely inefficient. We design the lock so that the actuator movement is minimal and is driven by a very low power motor. However there was one last issue. Most of the off-the-shelf batteries leak energy and deplete even if you are not using them after a 1-2 years. We are now using an advance lithium battery technology that has a very high energy density as well as very low leakage rate (This technology is commonly used to power sensors in remote sensing and telemetry application)
Eventually when the battery level drops low after a few years, you can notification on your phone and you can then replace the battery.
Go file a provisional patent! the patent regulations have changed since March 2013 from first-to-invent to first-to-file!:D
It will open your mind and give you life changing experiences. Stop working on some app...Go for something big. it will come to you