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Many mistakes are made even by large organizations and experienced developers. Don't add backdoors to access software. It’s best to avoid putting backdoor access into the system sooner or later someone else may find it. Make sure to Require User Authentication on every page. Follow proper testing practices before publishing any software. Use a Code Signing Certificate from a trusted Certificate Authority to increase the reputation of your software. Follow regular updates and patches for your software to keep it free from any vulnerabilities.