
gesichert
secured
Protected from danger, loss, or unauthorized access.
Das Gelände ist durch einen hohen Zaun und Kameras gesichert.
The site is secured by a high fence and cameras.
secured / confirmed
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secured
Protected from danger, loss, or unauthorized access.
Das Gelände ist durch einen hohen Zaun und Kameras gesichert.
The site is secured by a high fence and cameras.

confirmed
Confirmed as true, reliable, or certain; no longer doubtful.
Es gilt als gesichert, dass der Täter den Tatort kannte.
It is considered confirmed that the perpetrator knew the crime scene.

on safe
Refers to a firearm whose safety mechanism is activated so that it cannot fire unintentionally.
Prüfen Sie immer, ob die Waffe gesichert ist, bevor Sie sie ablegen.
Always check whether the weapon is on safe before you put it down.
'Gesichert' (secured/confirmed) is the past participle of the verb 'sichern' (to secure). It can stand before a noun like a normal adjective or be used as part of the predicate.
Der Kletterer war mit einem Seil gesichert.
The climber was secured with a rope.
The context makes the meaning clear: If it is about buildings or data, it means 'geschützt' (protected). If people are talking about information or knowledge, it means 'bestätigt' (confirmed). In connection with weapons, it means that the safety is activated.
Die Verbindung zu Ihrem Bankkonto ist gesichert.
The connection to your bank account is secured.
In the meaning 'geschützt' (protected), the preposition 'gegen' (against) is often used to name the danger. With 'durch' (by/through), the means of securing something is described.
Das Haus ist gegen Einbruch gesichert.
The house is secured against burglary.
To express that a piece of information is considered certain, the fixed phrase 'es gilt als gesichert, dass ...' (it is considered confirmed that ...) is often used. It is followed by a subordinate clause.
Es gilt als gesichert, dass regelmäßiger Sport die Gesundheit fördert.
It is considered confirmed that regular exercise promotes health.
sure / safe
Sicher and gesichert can both express that something is protected from danger or loss. Sicher describes this state directly. Gesichert additionally draws attention to the fact that the protection was created through a measure, such as a barrier or fastening. Use „gesichert“ when this protective measure is important.

Die wichtigen Unterlagen sind durch ein Passwort gesichert und vor unbefugtem Zugriff geschützt.
The important documents are secured with a password and protected from unauthorized access.
Die wichtigen Unterlagen liegen an einem sicheren Ort und sind vor Verlust geschützt.
The important documents are kept in a safe place and protected from loss.