yeah, "secret key" and "profile" are the words that i think will prevail eventually... a profile is like an icon of a person, one might be able to have many but usually each profile also represents one person... here's what the dictionary says about profile:
profile
[ proh-fahyl ]
Phonetic (Standard)
IPA
noun
the outline or contour of the human face, especially the face viewed from one side.
Synonyms: silhouette
a picture or representation of the side view of a head.
an outlined view, as of a city or mountain.
an outline of an object, as a molding, formed on a vertical plane passed through the object at right angles to one of its principal horizontal dimensions.
a drawing or the like representing this.
Surveying. a vertical section of the ground surface taken parallel to a survey line. Compare cross section ( def 6 ).
a verbal, arithmetical, or graphic summary or analysis of the history, status, etc., of a process, activity, relationship, or set of characteristics:
a biochemical profile of a patient's blood;
a profile of national consumer spending.
an informal biography or a concisely presented sketch of the life and character of a person.
Digital Technology. the personal details, images, user statistics, social media timeline, etc., that an individual creates and associates with a username or online account.
a set of characteristics or qualities that identify a type or category of person or thing:
a profile of a typical allergy sufferer.
the look, configuration, or lines of something:
cars with a modern profile.
degree of noticeability; visibility.
Psychology. a description of behavioral and personality traits of a person compared with accepted norms or standards.
Theater. a flat stage property or scenic piece cut from a firm, thin material, as of beaverboard or plywood, and having an irregular edge resembling the silhouette of a natural object.
(in a gear) the outline of either end of a tooth.
Naval Architecture. a longitudinal elevation or section of a vessel. Compare outboard profile.