Bitcoins can be used in a host of legitimate transactions for example, website Reddit allows users to upgrade services using bitcoins and blog service Wordpress.com's store accepts them as a form of payment.

WSJ: Bitcoin Virtual Cash Gets Money-Laundering Rule

"Spear-phishing" typically works by sending fake e-mails that look like legitimate correspondence, but which link to a malicious website or file attachment.

BBC: The White House as seen on 17 March 2010

"When (people) go shopping, they want the legitimate experience of the brand, " he told style website Business of Fashion recently.

CNN: SHARE THIS

Complicating matters is that the legitimate Evernote e-mail pushes users first to a website with the domain name "mkt5371" before taking them to Evernote itself.

CNN: 50 million compromised in Evernote hack