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.

'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 or reliable. 'sicher' is more general: a road can be safe, a person can feel safe, or a piece of information can seem reliable. 'gesichert' puts more emphasis on something having been actively protected, locked, or confirmed. Data, doors, or evidence, for example, can be 'gesichert'. Learners may confuse the words because both have to do with protection and certainty. As a simple guide: 'sicher' often describes the state, while 'gesichert' often describes the result of securing or checking something.

Die wichtigen Dateien sind auf einer zweiten Festplatte gesichert.
The important files are backed up on a second hard drive.
Der Kunde fühlt sich mit dem neuen Passwort sicher.
The customer feels safe with the new password.