The voting systems maker currently has nine separate components under state review for certification, including technology that's part of its AccuVote TSX touch-screen voting machine and the AccuVote OS optical scan device. The latter product was scheduled this month for a hacking test by a security expert to determine if its memory card was vulnerable to tampering.

On Tuesday, McPherson issued a statement saying his office needed "additional federal evaluation" before it would proceed with Diebold's application.

The news comes as California, along with every other state, faces the deadline for satisfying the requirements of the Help America Vote Act. The act requires that in 2006 every polling location will have a handicapped-accessible, e-voting or other device installed.

"I have consistently stated that I will not certify any system for use in California unless it meets the most stringent voting system requirements," McPherson said in a statement. "We are at a critical crossroads for voting system technology; therefore, we must take every available step to ensure the security and integrity of every vote cast in this new electronic age." McPherson also said office will work with California counties on state and federal voting compliance.

In a letter (download PDF) to Diebold on Tuesday, Caren Daniels-Meade, chief of the elections division under McPherson, noted there were "unresolved significant security concerns" around the memory cards used in the AccuVote OS and AccuVote TSX. The card wasn't subjected to federal source-code review and evaluated by independent testing authorities (ITA), Daniels-Meade said. McPherson's office wants both the AccuBasic code on the card, as well as the AccuBasic interpreter, which reads the code, submitted for independent review.