What’s wrong with the fox? I like their logo. A lot of big, mainstream brands have fun-looking mascots. They may have to redesign and improve it as they grow, like everybody does, but I don’t see it necessary to replace it completely.
I agree that the logo insinuates that you're probably sneaking around doing nefarious things, if you're interested in encrypting your messages.
I actually feel a bit bad saying it and sad this is the top comment right now since it's a fairly minor point and way less important than what they are doing. I just think you have one chance to make a first impression about what your company stands for and the logo is a big part of that. In fact it's one of the parts that is most likely to end up representing your brand on other sites. Looking at their site, I think they care about that a lot and put a lot of effort into it so I hope this comes off in the best possible way.