What is required to make a one$-$time pad encryption system truly unbreakable?

Question $6$ Answer

a$.$

Use an obscure, published book, with a secret way of choosing the key from words, lines, or phrases in that book; this secret must be known only to sender and recipient. This simplifies the key distribution and management process.

b$.$

Generate the one$-$time pad key using a cryptographically strong pseudorandom number generator, with a very large random number as seed. Ensure that no portion of it is ever reused, and ensure that only one sender and one recipient have copies of it$.$ Destroy sections of the pad as they are used. Protect the one$-$time pads at both sender and recipient from loss, theft, or compromise. Provide secure$,$ immediate means to signal both parties of any loss or compromise or change in identity of sender or recipient.

c$.$

Generate the one$-$time pad key in a truly random fashion, ensure that no portion of it is ever reused, and ensure that only one sender and one recipient have copies of it$.$ Destroy sections of the pad as they are used. Protect the one$-$time pads at both sender and recipient from loss, theft, or compromise. Provide secure$,$ immediate means to signal both parties of any loss or compromise or change in identity of sender or recipient.

d$.$

Combine it with asymmetric encryption systems to create a hybrid architecture, using peer$-$to$-$peer certificate authority mechanisms that mask the real identity of the CA$,$ sender$,$ and recipient. This keeps the public keys very private $($rather than published$)$ for improved reliability.