Dsc registeration

Director is resigning and needs to submit the details in DIR 11 to the ROC. But he don't know the details filled during the application of DIN. While registering his DSC on ROC, we don't the his mother maiden name. When we use his mother name as on records, it shows details not matched with the details provided at the time of DIN application. My Queries are: 1. Can we file resignation without of Director without registering his DSC on Mca site. 2. How can we know his mother maiden name, filled at the time of DIN application. Please help,