If you are truly concerned go with a reputable VPN... not a free one. Honestly as a Network Security engineer you will be fine as long as you dont keep that ledger and the computer side by side. Lock the ledger in your safe when you are not using it. You can in fact use software to encrypt your entire computer (I do this) that way even if your lappy is stolen your data is still difficult to retrieve.... not impossible but it takes a lot of skill, time and persistence to break down encryption. Most common thieves wouldnt even bother. Add to that the level of skill and equipment needed to sniff out your traffic... someone would have to basically target you. I can tell you that a little paranoia is good but the reality is you are in no further danger of cyber crime than you are at home. A slightly safer solution... use telephone banking. Being a frequent traveler to negril who also needs access to sensitive data while away Ive never felt my information was in danger. I run many types of security software on my laptop from intrusion detection to a custom firewall that I wrote. Ive never tracked any malicious traffic while there.... which is no fun for me cause I like a challenge