All those IoT devices you've heard about getting hacked, were exposed on the internet where they could be discovered by anyone, and they still had their default logins. They also all ran Linux and had not downloaded a security update that mitigated risks.
E.g. cable DVRs. Internet facing cameras. Baby monitors that open a forwarding port through your router's firewall.
Home automation devices will normally only be inside your home's LAN or Z-Wave network. Your internet router should by default keep outside malware probes away, and if you do some checking, you can ensure you use Z-devices with their standard 128-bit encryption turned on (all door locks come that way).
So if you secure your router and any other internet-facing devices with a decent password, and install updates, you should be in good shape.
It goes beyond that unfortunately, since, as was recently highlighted and conceded by Amazon. There is a whole world of difference in privacy and security depending on a company's approach. It costs time, money and effort to ensure privacy and security and most companies have shown they will skimp, and in many cases, completely ignore those expenditures because they want to save money and effort and rush products to market. Amazon's eco-system encourages that as Amazon is most concerned with grabbing mind share as quickly as possible. The net result is
"Amazon acknowledges that unlike Apple, it can't guarantee the security of third-party devices."
"To be Homekit-certified, gadget makers must include special chips to work with Apple’s system. ... Manufacturers also have to send product samples to Cupertino, where Apple tests them extensively for compatibility. The whole process can take three to five months." Amazon completes its "review" in less than 10 days!
"Alexa, by contrast, only requires smart home companies to write software code and submit it to Amazon for the ten day or less review. There are no special chips."
"Some developers say Apple's approach is worth it. "They found issues with our product before we released it that we didn't find in our testing," said Gimmy Chu, CEO of Nanoleaf, a smart lighting system. "We know that after we have the certification that it's rock solid."
So, yes companies have to spend more time and money and wait much longer to get their device to be part of the Apple's ecosystem, but thankfully in our free market companies and consumers get to decide if they want to be part of the wild, wild west, or the HomeKit ecosystem where:
"Apple's approach has some clear advantages when it comes to privacy, security and ease-of-use. (HomeKit gadgets, for example, can operate without being connected to the Internet.)
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Yes, I'm sure the primary reason Apple has fallen behind in home devices, desktop computing, laptop computing, dropped wireless hardware development, stopped making monitors, havnt updated their imacs in nearly 500 days, and headphones being their most exciting product is because their 66,000 employees cant figure out network security.
And dismal old Siri, that must be a security issue too, right?
Lots of myths there, but let me deal with just one
Actually, Siri has fared very well in al the head to head match ups with Google, Cortana, etc. I have used both extensively and give the edge to Google in more consistent understanding of voice, but there are areas where Siri out performs Google with certain tasks, and overall Siri is as good. Echo pales in comparison to both in terms of capacity, e.g., number of languages, tasks, etc. Echo has great voice understanding with a stand alone device with multiple microphones and there a a lot of scripts that have been written for it.
From AndroidPit- "Both personal assistant tools are still very much works in progress, but both already yield impressive results. Google Now seems to have the edge in accuracy, but Siri beats it on speed."
From Yahoo Tech review, "For now, Siri leads the pack, with Google Now millimeters behind. Cortana and Alexa have richer, more realistic voices and many more hand-tailored responses—but because they’re so new, they’re not nearly as capable. https://www.yahoo.com/tech/battle-of-the-voice-assistants-siri-cortana-211625975.html
Here's a Youtube by Marcus Brownlee that shows how close Siri and Google are from the end of 2016.
In summary, both have a long way to go, but for now are very close. I'd also choose Siri over Google if your privacy and security is important to you as Google concedes they are storing everything you say and linking it according to your master file number that links everything you do across the web
PS. If you want to get excited about what we are likely to see from the Next Gen of Siri this year, take a look at this technology that they now own from VocalIQ
https://9to5mac.com/2016/05/30/vocaliq-siri-intelligent-assistants-war/