Several people have commented that scanning your signature is a bad idea because if someone got a hold of the file they could sign away everything you own. Obviously you should keep the file private. I wouldn’t recommend attaching it to each of your emails or putting it on a web page or anything like that, but it is probably no more risky than anything else you do on a regular basis.
Consider the following:
- If you ever write a check or sign a credit card receipt at a store, you are essentially handing a stranger a copy of your signature already. They could easily digitize it using the process I’ve just shown and use to sign things as you.
- Most of the time when you sign something, does anyone verify that it is indeed your signature? Most stores don’t even verify that your signature matches the back of a credit card. Someone could just as easily sign something as you using their own handwriting and it would probably slip through just fine. If you apply for a credit card, they aren’t verifying your signature against anything. If someone wants to get a credit card in your name, they aren’t going to need your signature to do it.
- Anything important is going to require more than just a signature. If you buy a house or something like that, they are going to require a notarized signature. That means that someone verified you are who you say before sign the document.
I’m not saying that someone getting your signature couldn’t prove to be inconvenient, but I can’t think of much someone could do that they couldn’t do already. Especially because most people’s signatures are widely distributed already and it wouldn’t take much effort to get a copy.