Here’s a concise paragraph summarizing the news article:

DigiCert is implementing changes to TLS/SSL certificate lifespans, primarily driven by a recommendation from the CA/B Forum that shorter lifetimes – initially 47, then 100 days – are necessary due to declining certificate trustworthiness and the unreliability of existing revocation methods like CRL and OCSP. To facilitate this, DigiCert advocates for widespread automation of certificate lifecycle management, offering solutions like Trust Lifecycle Manager and CertCentral, and assures customers that costs won’t increase due to more frequent replacements. The shift is intended to address growing concerns about certificate validity and streamline the process through automation, with the ultimate goal of making manual revalidation obsolete by 2029.