FULL TUTORIAL AVAILABLE HERE: hottipscentral.com/how-to-install-siri-on-iphone-4-and-3gs-running-ios-5-1-1-jailbreak-required/
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UPDATE #1: Siriport has received an update in Cydia, and they’ve expressed that the certification isn’t working at this time. They are developing a fix for the situation, and will be responding shortly. If this process isn’t working for you, please wait for further feedback from the Siriport team as they work tirelessly to amend things on their end.
UPDATE #2: The certificate is now found at a different address than what’s displayed above. Please use the new address found in the tutorial. The top link above will help you.