Ca lock is a small tool similar to U disk needed by electronic bidding system. Ca lock is essential in electronic bidding system. You can encrypt and upload payments by inserting the payment lock into your computer. Bidding ca lock is essential in electronic bidding system and must be handled. Without this, you can't bid. For details, please contact the contact information of the tender announcement. The bidding ca lock is provided by the local public resource trading platform or the bidding management department. The bidding ca lock not only makes bidding documents through tool software, but also directly carries out CA authentication and digital signature on electronic bidding documents through tools after the bidding documents are made, which reproduces the process of making and printing paper bidding documents, and then manually signs and signs where signatures are needed in the documents, which reduces the workload of bidders in preparing bidding documents, and generates complete and legally effective electronic bidding documents through preparing tool keys.