An anonymous reader writes "Security firm RSA has revealed that it believes two groups, working on behalf of a single nation state, hacked into its servers and stole information related to the company's SecurID two-factor authentication products. Speaking at the RSA Security Conference in London, RSA executive chairman Art Coviello described the high profile attack thus: 'There were two individual groups from one nation state, one supporting the other. One was very visible and one less so. We've not attributed it to a particular nation state although we're very confident that with the skill, sophistication and resources involved it could only have been a nation state.' Sophos security researcher Graham Cluley questions how RSA has concluded that a country was responsible for the attack — when RSA is unwilling to name who it suspects. Could it be that the firm is simply applying spin, describing the attack as a 'highly sophisticated Advanced Persistent Threat' to protect its image?"