just so folks don't go rebuilding their systems in a panic, this "assistantd" message relates to the Dictation functionality - enabled on a laptop by hitting the "fn" key twice - that allows one to speak into an app like TextEdit and have it
, your Mac might ask you to update your keychain password or enter the password of your login keychain. It might also tell you that the system was unable to unlock your login keychain. That's because your login keychain is still using your old
on Mac OS X is related to the new dictation functionality. Dictation on Mac OS X 10.8 uses Contacts and other personal information to improve accuracy; gaining access to this information would explain the need for Keychain access.
assistantd is associated with the Siri agent on your Mac. I assume Facebook or some plugin is requesting it so that Siri can manage it; I’ve never had it do that for me. It could also be malware in your browser. It’s likely trying to access