olemus
Wiktionary:
2. something that envelops; a wrapping

Merriam-Webster:
envelop, transitive verb
1: to enclose or enfold completely with or as if with a covering

enveloped, adjective:
enclosing, surrounding, concealing, encompassing, shrouding, encircling, all-embracing, enfolding

näiteid
avaliku võtmega ümbriskrüpteerimine