Logo for notary business

I have a "signing" company that explains documents and witnesses signatures for title and mortgage companies. The name of the company is "Secured Closing Connections". I'm looking for a simple design, probably in simple colors like blue and black. I don't want too much detail but also want the logo to be strong and meaningful. My company deals with very personal and sensitive information and I want the message of "secure" to come across without being too obvious (like no locks and such.)