Vocabulary!

Pseudorandom number generation (PRNG)

use for probability and statistics application to generate large scale random number.

Retrofitted : later added component, not considered necessary at the time of manufacture.

Perspecta: never stop solving:

Perseverance: steadfastness in doing something despite the difficulty and the delay in achieving.   

Seldom: rarely, not often

Vulnerability: state of being exposed to the possibility of being attacked or harmed, either physically or emotionally.