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CFCA Security Application Development Kit This extension is customized for 南方电网互联网服务有限公司 and uses the latest Chrome mechanisms for CFCA certificate applications. After installing the extension, users can use a CFCA U-key in the company's 南网e链 system for multifactor authentication with a U-key certificate and user password, meeting security requirements for business data submission. It can also be used to sign and seal business contracts, making contract attachments legally valid and traceable.