Arlo the auditing tool may play a key role in securing next year’s elections. The open source tool, created by VotingWorks in partnership with the Cybersecurity and Infrastructure Security Agency (CISA) and departments from a number of states, is intended to provide an easy way to perform the calculations needed for the audit: determine how many ballots to audit, randomly select which ballots will be audited, compare audited votes to tabulated votes, and tell officials when the audit is complete.