Madhushri Shanmugam

PKI-focused Cybersecurity Engineer with ~2 years of experience in enterprise security operations and hands-on exposure to Public Key Infrastructure (PKI) using Microsoft ADCS. Experienced in certificate lifecycle management including CSR generation, certificate issuance, revocation, and validation for digital signature use cases. Strong understanding of X.509 certificates, TLS/SSL, CRL, and OCSP, with working knowledge of certificate lifecycle management tools like Venafi.

Skilled in incident handling, monitoring, and operating within 24×7 managed services environments, with a focus on improving certificate hygiene, reducing risk from expired/misconfigured certificates, and supporting secure cryptographic operations.

Cybersecurity Analyst - Tata Consultancy Services (TCS)

(2024-04)

• Administered certificate lifecycle activities using Microsoft ADCS, including CSR generation, certificate issuance, revocation, and validation
• Issued digital signature certificates and supported secure certificate deployment across enterprise use cases
• Performed certificate-related request handling and troubleshooting within enterprise environments
• Supported certificate lifecycle operations, ensuring timely renewal and minimizing service disruptions
• Monitored and handled certificate-related incidents, ensuring SLA-driven resolution
• Basic exposure to Venafi for certificate lifecycle and machine identity concepts
• Strong understanding of X.509 certificates, TLS/SSL protocols, CRL, and OCSP
• Familiar with enterprise PKI architecture including Root CA and Subordinate CA concepts
• Basic understanding of Hardware Security Module (HSM) for secure key storage and cryptographic operations
• Investigated phishing, spoofing, and impersonation attacks across enterprise environments
• Analyzed email headers and authentication mechanisms (SPF, DKIM, DMARC) to identify threats
• Configured and managed security policies in Microsoft Defender for Office 365
• Performed vulnerability scanning using Rapid7 and generated reports based on CVSS scoring
• Managed security incidents using ticketing systems, ensuring timely resolution and proper documentation
• Collaborated with cross-functional teams for remediation and security improvements

BTech - Bioinformatics - Sastra Deemed University (2023)