In a letter sent to shareholders, JPMorgan Chase Chairman and Chief Executive Officer Jamie Dimon has noted some interesting things about the cybersecurity challenges faced by the bank, and its plans for addressing the issues. It turns out that, last year, the financial institution earned around $23 billion (16.5 billion). Some of the companys revenue has been used for cybersecurity. In 2012, JPMorgan Chase spent $200 million (144 million) to protect its IT infrastructure…