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The spoofer (reffered to as the "lockpick" in the game files) is used by the UNSC forces to force open doors and override certain pieces of equipment by sending in an electrical current that stabalizes the door that may be locked, damaged, or otherwise unable to function.
They are standard equipment to Marine fire teams when deployed into ground engagements. One was used to open the door in the containment facility where the Flood were released from.[1]
In 2552, Private Kappus used one to open the door to the Flood Containment Facilities. He was ordered by Captain Keyes to open the door that happened to be the only thing holding back the Flood. Unwillingly and unknowingly, Kappus unleashed the Flood on Installation 04, dooming him and the rest of his squad,[2] save for Johnson.
The only Spoofer ever seen is in Halo:CE on the level 343 Guilty Spark.