The brief has been issued by Privax, a tech security firm, which launched Hide My Ass in 2005, used by seven million people to encrypt their internet connection.
Privax provides users with access to secure proxy servers that hide personal details from potential hackers and online identity thieves.
The agency will develop an on- and offline media relations strategy to expand Hide My Ass' user base while educating internet users of the risks and importance of online security.
The amount of money stolen via online banking fraud leapt to £22m between January and June this year – a rise of 28% on the same period last year. 12 million pieces of personal information were fraudulently traded online between January and April this year, a threefold increase on 2010 levels, according to Experian.
Danvers Baillieu, COO of Hide My Ass, commented: ‘The business has grown exponentially over the years and it has reached a stage where we need reliable, expert help to develop the brand and what it stands for.
'Brazil was always on our radar as we know their experience in the sector is extremely strong, so we’re delighted to be working with them at such an exciting time for the business.’
Joshua Van Raalte, chief executive at Brazil, said: ‘Privax is at the forefront of online security so it's great to be working with them to help shape how consumers use the internet in a secure way. It’s a market we know very well so we’re looking forward to combining our expertise with the innovation offered by Privax.’