With data breaches on the rise, cybersecurity stocks have become a major growth niche in the tech sector over the past few years. But over the past year, concerns about slower enterprise spending, lack of profitability at many companies, and lofty valuations have weighed down the entire sector. The PureFunds ISE Cyber Security ETF (NYSEMKT: HACK), which contains a basket of top cybersecurity stocks, has fallen more than 25% over the past 12 months.