A Class 3 Digital Signature Certificate (DSC) is the highest security-level digital signature in India. It\'s primarily issued on FIPS certified USB tokens secured with 2048-bit encryption and SHA-2 algorithms, ensuring robust security for high-value online transactions. Who is it for? • Individual users (Class 3A): Personal use, such as e-filing and e-tendering. • Organizations (Class 3B): Authorized signatories submitting bids and company documents. Common Use Cases Class 3 DSCs are essential for: • e Tendering / e Procurement — mandatory for government jobs, high value bids. • e Filing & compliance: GST, Income Tax, ROC/MCA, EPFO, etc.. • DGFT trading, trademark/patent filing, secure email, domain ownership, SSL/TLS, and code signing . Technical Specs • Classes: 3A (Individual), 3B (Organization) • Type: Signing only (combo with encryption optional) • Validity: 1–2 years (sometimes up to 3 years)