Why is a Virtual Private Network considered to be a secure connection?

Hi,

Many experts and sensitive customers like banks consider VPN is not enough secure as it uses the public network (internet) for communication, they may use any other solution to provide security like dial up with enough speed.

VPN is used to connect clients to subnet or subnet to subnet by creating a virtual tunnel on internet, the VPN is considered secure as it is asks for authentication for clients who will connect and provide encryption and integrity.

Regards,

vpn making authentication , encryption  for data transfer , , stronger than MD5 in data encryption 

VPN is secured because it use Encryption which means before a data is sent through VPN it has to be encrypted even if someone is intercepted the data while it is transmitted they will never get the message unless they have encryption key