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1

As a rule of thumb, I find it helpful to always assume that there is a stranger somewhere on earth seeing all of my traffic unless I am using https, vpn, or some manner of encryption. If you make this assumption, then someone splicing into your connection outside of your home shouldn't freak you out too much, because you will not be transmitting anything ...


1

End to end encryption? If they grab your encrypted traffic it isn't very useful to them. Except knowing packet destinations I guess. Other than that brick & mortar security. Padlocks & access control. CCTV. It's plain old physical access control. If the adversary has control over your physical hardware it makes his life much easier.


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I wrote a partial solution to your need which I share. I only want to enable USB on exceptionnal occasion. I'm running a computer on which the use of an USB key can't be allowed. I wrote a shell script usb which is only switching on the required extensions to enable visibility of USB mass storage when I need it. Here is the man: Usage: usb [on|off|] To ...


4

Sure, Powerline adapters have done this for years. For example the Belkin Surf POWERLINE NETWORKING ADAPTER employs 128-bit AES encryption.


2

If you choose to implement encryption at the physical layer, it might be because: Either you need for some reason to support anything which could compose the link layer 2, you want your encryption scheme to be independent and transparent to potentially unsecured upper layers. Some requirement make it unavoidable to work as close to the physical as ...


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You could think of Quantum Cryptography as a form of cryptography at the physical level. Quantum Cryptography uses the properties of quantum mechanics to send messages that can't be intercepted by a 3rd party. It's not cryptography in the strictest sense, but it serves the same purpose of preventing 3rd parties from intercepting data. Of course, it ...


3

The job of physical layer is to transmit the data over some channel(cable or wireless medium). If encryption was done at the physical layer, then all the data, including the application data, the destination IP address, port number, different headers, etc. will be encrypted as well. When this encrypted data will be transmitted, the next node(router,switch, ...


1

The data link layer is the lowest layer where actual data is exchanged, the physical layer immediately below that is the mechanism for passing that data. You could insert an encryption layer in between your physical layer and your data link layer that flips bits on the wire in a manner that a device at the other end would be able to decode, but really all ...



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