Someone who's able to intercept the message as it's transmitted could inject some data, and then the person who verifies the signature would be told it's a valid, unaltered message.

The data indicates that the virus is being transmitted efficiently from dog to dog, and this indicates that the equine virus was transmitted to dogs and is now well established in the dog population.

The data indicate the virus is being transmitted efficiently from dog to dog. It is now well established in the dog population.

What's the difference between measuring the gas pumped through a pipeline or the data transmitted through a voice line?

We aren't aware of any systems that have been compromised yet, but it's likely to happen since there's exploit code out.

Vendors can take months to create patches, and sometimes users grumble about that, ... But the alternative is to have patches that can be circumvented or aren't appropriate for the vulnerability. It's a difficult balance.