Protocol for connection between Arduino ETH and Windows VB.NET controler app

hello all

i need to make an windows forms application (in VB.NET) that communicate with an arduino with ethernet shield.
i will have some signals in the arduino that must be sent to the VB.NET app, and will have some data, such as servo and signals, that must also be sent from the VB.NET app to the arduino.

for what i've read, UDP and TELNET protocol are not secure, because UDP will not have the security that all data transfered between the 2 systems will be delivered and in TELNET, is not secure because some 'sniffers' can be installed in the network and 'steal' the commands, because is an text and not encrypted protocol.
is this true?

any sugestions?
best regards

for what i've read, UDP and TELNET protocol are not secure, because UDP will not have the security that all data transfered between the 2 systems will be delivered and in TELNET, is not secure because some 'sniffers' can be installed in the network and 'steal' the commands, because is an text and not encrypted protocol.
is this true?

Secure and reliable are two different attributes.

UDP is considered unreliable, since there is no guarantee that packets will be delivered, or that they will be delivered in a specific order.

Even if the data was encrypted, there is no guarantee that it won't be sniffed.

i will have some signals in the arduino that must be sent to the VB.NET app, and will have some data, such as servo and signals, that must also be sent from the VB.NET app to the arduino.

What data here really needs securing?

If you really need security, don't put your Arduino on the internet.