January 24th, 2013 at 22:41 UTC by Joseph Bonneau
Today the UK Information Commissioner’s Office levied a record £250k fine against Sony over their 2011 Playstation Network breach in which 77 million passwords were stolen. Sony stated that they hashed the passwords, but provided no details. I was hoping that investigators would reveal what hash algorithm Sony used, and in particular if they salted and iterated the hash. Unfortunately, the ICO’s report failed to provide any such details:
The Commissioner is aware that the data controller made some efforts to protect account passwords, however the data controller failed to ensure that the Network Platform service provider kept up with technical developments. Therefore the means used would not, at the time of the attack, be deemed appropriate, given the technical resources available to the data controller.
Given how often I see password implementations use a single iteration of MD5 with no salt, I’d consider that to be the most likely interpretation. It’s inexcusable though for a 12-page report written at public expense to omit such basic technical details. As I said at the time of the Sony Breach, it’s important to update breach notification laws to require that password hashing details be disclosed in full. It makes a difference for users affected by the breach, and it might help motivate companies to get these basic security mechanics right.