Explain the relationship between testability and security. 1. List several countermeasures against JTAG hacks and explain any one of them in detail. 2. Optical microscopy can be used to produce...

Explain the relationship between testability and security.

1. List several countermeasures against JTAG hacks and explain any one of them in detail.

2. Optical microscopy can be used to produce transistor images in latest technology node.

3. If each metal layer has the same wire width and space, internal layer is better than top layer to build active shield to prevent bypass attack.

4. Different doping profiles of a transistor are not easily detectable via optical microscopy.