This is the 4588th most frequent German word.
sicheres
"Safe" or "secure."
In this context, "sicheres" is used as an attributive adjective (safe or secure) describing the noun "Passwort" (password).
Ich suche ein sicheres Passwort für meinen Laptop.
I am looking for a secure password for my laptop.
Here, "sicheres" describes "Auto" (car), emphasizing the safety and reliability aspect as an attributive adjective.
Ein sicheres Auto kann Leben retten.
A safe car can save lives.
In this case, "sichere" acts as an attributive adjective describing "Verbindung" (connection), indicating security in terms of protected communication.