A recent data breach study commissioned by the state of Maine sheds light on the losses banks experienced as a result of the data breaches at TJX and Hannaford Brother’s supermarkets. The state’s banks said they incurred $2.1 million in expenses related to data breaches since January 1, 2007. The Hannaford breach had the largest impact, affecting 71 financial institutions and incurring $1.6 million in expenses according to the Maine Data Breach Study. Adam Shostack, blogger and author of The New School of Information Security, said the expenses turn out to be about $450 for each breached account, which is inline with the estimated figures on for sales of pilfered account data on the black market.