How secure is the Audi A5's keyless entry system?

I have heard concerns about keyless entry systems being vulnerable to hacking and theft. I am considering purchasing an Audi A5 and want to know if its keyless entry system is secure.

According to multiple security tests and experts, the Audi A5's keyless entry system is relatively secure. However, no keyless entry system is completely immune to hacking or theft, especially if proper precautions are not taken.