How a #Google Headhunter’s E-Mail Unraveled a Massive Net Security Hole | Threat Level | Wired.com
►http://www.wired.com/threatlevel/2012/10/dkim-vulnerability-widespread
For security reasons, the #DKIM standard calls for using keys that are at least 1,024 bits in length. But Google was using a 512-bit key – which could be easily cracked with a little cloud-computing help.