The invention provides a method of verifiable generation of public keys. A trench is formed in an isolation film in a Self-Aligned Floating Gate scheme. The received response documents are then utilized in the central site to determine which object to retransmit to the receiver. If the variance of per-connection bandwidths exceeds a threshold, more connections are added until either variance does not exceed the threshold or a maximum number of connections are established. Borescopes and catheters capable of scanning multiple sections or areas of materials and tissues using these sensors are described.