Question

what is the concept of inscriptions description where it is commonly used

Answer 1

Inscription is a "the worfing on a medal, note or tomb". Also it means "words inscribed, as on a monument or in a book".

Description is a label attached to the item or a brochure or a any textual representation of something.

Though please refer to you question as the tern encryption and decryption are more commonly used in computer science. And they are used in cryptography.