15,000 Employees. Millions of Cardholders. A US Bank’s Path to PCI DSS 4.0 Compliance.

[cs_hero title_colored = "15,000 Employees. Millions of Cardholders." title_after = "A US Bank's Path to PCI DSS 4.0 Compliance." industry = "Financial Services: Retail Banking" engagement_type = "PCI DSS 4.0 Encryption Assessment & Compliance Remediation Roadmap" download_url = "https://preview.encryptionconsulting.com/wp-content/downloads/case-studies/A-US-Bank-Path-to-PCI-DSS-4-Compliance.pdf" ] [cs_excerpt] How Encryption Consulting assessed a leading US retail bank's cryptographic infrastructure, uncovered critical compliance gaps, and delivered a remediation roadmap that reduced data breach risk by 58%, achieving PCI DSS 4.0 alignment. [/cs_excerpt] [cs_profile_desc] A prominent US retail bank with 15,000+ employees, a nationwide network of branches and ATMs, and millions of customers. It offers personal banking, credit cards, loans, and wealth management, with a decade of rapid growth driven by digital innovation including mobile banking, 24/7 support, and automated loan processing. [/cs_profile_desc] [cs_at_a_glance stat1="58%" label1="Data breach risk reduced" stat2="PCI 4.0" label2="Compliance alignment delivered" stat3="TLS 1.2+" label3="Minimum protocol enforced" stat4="HMAC" label4="Keyed hashing + tokenization" ] [/cs_hero] [cs_challenges desc=”With a high volume of daily transactions and sensitive cardholder data across multi-cloud and on-premises environments, the bank needed a thorough assessment of its cryptographic infrastructure. PCI DSS 4.0’s stricter requirements exposed gaps the existing setup couldn’t address; three were the most material.”] [cs_challenge icon=”0″ title=”Outdated hashing without keying or salting” tag=”Cryptography”] Cardholder data was stored using plain one-way hashing with no keying or salting, leaving it open to brute-force and precomputed attacks and short of PCI DSS 4.0’s cryptographic requirements. [/cs_challenge] [cs_challenge icon=”1″ title=”Obsolete encryption protocols in active use” tag=”Encryption”] Systems still relied on SSL and older TLS (1.0 and 1.1) with weak algorithms (MD5, RC4, SHA-1), exposing data in transit to man-in-the-middle interception and breach. [/cs_challenge] [cs_challenge icon=”2″ title=”Encryption keys stored alongside protected data” tag=”Key Management”] Keys were stored in the same database or server as the data they protected, so a single compromise handed attackers both the keys and the cardholder data, violating PCI DSS key management requirements. [/cs_challenge] [/cs_challenges]

[cs_quote author=”Encryption Consulting” role=”Engagement Summary · Encryption Consulting · Compliance Services”] The gaps weren’t theoretical: outdated hashing, obsolete protocols, co-located keys, and non-compliant vendors created a compounding risk profile that PCI DSS 4.0 was specifically designed to eliminate. [/cs_quote]

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[cs_solutions desc=”Four workstreams addressed the full scope of the bank’s PCI DSS gaps including assessment and data-flow mapping, cryptographic controls uplift, authentication and access hardening, and vendor and data-retention remediation. Every recommendation was compiled into a remediation roadmap, with tactical and strategic options for each use case in scope.”] [cs_solution title=”Assessment, Data Flow Mapping & Gap Analysis” image_url=”https://ecwebsitedata.blob.core.windows.net/encryption-consulting-website-data/2026/07/A-US-Bank-Path-to-PCI-DSS-4-Compliance-solution-banner-1.jpg”] Reviewed cryptographic policies and procedures through stakeholder workshops, mapped sensitive data flows ingress to egress, and scoped use cases. A PCI DSS 4.0 gap analysis produced a report of risks and a remediation roadmap. [/cs_solution] [cs_solution title=”Cryptographic Controls Uplift” image_url=”https://ecwebsitedata.blob.core.windows.net/encryption-consulting-website-data/2026/07/A-US-Bank-Path-to-PCI-DSS-4-Compliance-solution-banner-2.jpg”] HMAC keyed hashing replaced plain one-way hashing, TLS 1.2+ replaced SSL and older TLS, and vault-based tokenization substituted cardholder data with tokens. A dedicated KMS with HSMs isolates keys from protected data, with regular rotation. [/cs_solution] [cs_solution title=”Authentication, Access & Password Hardening” image_url=”https://ecwebsitedata.blob.core.windows.net/encryption-consulting-website-data/2026/07/A-US-Bank-Path-to-PCI-DSS-4-Compliance-solution-banner-3.jpg”] Updated PCI DSS 4.0 password policies and required MFA across all CDE access, with double authentication at remote login and the CDE entry point. RBAC was strengthened and FIDO biometric / smart-card auth added at higher-risk points. [/cs_solution] [cs_solution title=”Vendor Compliance & Data Retention Remediation” image_url=”https://ecwebsitedata.blob.core.windows.net/encryption-consulting-website-data/2026/07/A-US-Bank-Path-to-PCI-DSS-4-Compliance-solution-banner-4.jpg”] Reviewed third-party vendors and required risk assessments, audits, contractual PCI DSS adherence, and continuous monitoring. SAD (CVV, PIN, PIN blocks, magnetic stripe) is now automatically deleted or masked after authorization. [/cs_solution] [/cs_solutions]

[cs_quote direction=”rtl” author=”Encryption Consulting” role=”Engagement Summary · Encryption Consulting · Compliance Services”] The result is a cryptographic environment aligned to PCI DSS 4.0 including modern hashing, upgraded protocols, isolated key management, hardened authentication, compliant vendors, and automated data-retention enforcement across the entire banking infrastructure. [/cs_quote]

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[cs_outcomes desc=”The remediation roadmap gave the bank a clear path to PCI DSS 4.0 compliance, strengthening cardholder data protection, reducing breach risk by 58%, and establishing governance to maintain compliance as standards evolve.”] [cs_outcome title=”Data protection transformed”] TLS 1.2+, HMAC hashing, vault-based tokenization, and isolated KMS with HSM key storage replaced outdated protocols, sharply strengthening cardholder data protection at rest and in transit and cutting brute-force and man-in-the-middle exposure. [/cs_outcome] [cs_outcome title=”Breach risk cut 58%”] Automated SAD deletion, account lockout, vendor compliance enforcement, and streamlined audits cut breach likelihood by 58%, replacing manual intervention with a repeatable, efficient compliance cycle. [/cs_outcome] [cs_outcome title=”Trust and future-readiness reinforced”] PCI DSS 4.0 compliance reinforced the bank’s commitment to protecting customer data (a key factor in retention and acquisition) and laid the foundation for a future-ready infrastructure as requirements evolve. [/cs_outcome] [/cs_outcomes]

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