Blog

Strong customer authentication solutions: the cornerstone of modern digital trust

In the fast-evolving landscape of digital finance, the importance of robust customer authentication cannot be overstated. As cybercrime continues to surge and regulations tighten, financial institutions and merchants are compelled to seek Strong Customer Authentication (SCA) solutions that secure transactions, comply with global mandates, and deliver seamless experiences. This blog explores the meaning of SCA, its regulatory implications, evolving technologies, and best practices.
What is Strong Customer Authentication (SCA) and why does it matter?
Strong customer authentication is a regulatory standard under the EU's Payment Services Directive 2 (PSD2) that aims to reduce fraud by enhancing the security of electronic payments. SCA requires users to verify their identity using two out of three authentication factors: something they know (like a password), something they have (a phone or card), and something they are (biometric data).

  • Knowledge: Pin, password, secret question
  • Possession: Smartphone, security token
  • Inherence: Fingerprint, facial recognition, voice

This layered approach addresses a simple challenge: single-factor authentication methods are no longer effective against modern fraud techniques such as phishing, credential stuffing, and account takeover (ATO) attacks.

While SCA emerged as a core component of the European Union’s Payment Services Directive 2 (PSD2), its principles now shape global expectations around secure digital transactions.
Regulatory drivers: PSD2 and beyond
SCA is a core component in the EU’s PSD2, which mandates multi-factor authentication for online payments and certain account access activities. For those operating in, or serving customers from, the European Economic Area (EEA), compliance is non-negotiable. Regulations across other global markets increasingly follow similar standards as digital banking and e-commerce become universal.

  • Key milestones: Implemented in 2021
  • Primary use case: Card-not-present (CNP) transactions. Plus, additional security for online banking and sensitive account changes
  • Regulatory impact: Businesses failing to comply risk legal action, reputational damage, and financial loss

It is crucial to recognize that SCA compliance is not merely a checkbox exercise but a foundation for building customer trust in the digital age
Learn more about PSD3 in our blog, ‘PSD3 news: Beyond compliance, how banks can gain competitive wins’

The evolution of banking and payment authentication
Legacy authentication systems, which often rely on SMS one-time passwords (OTPs) or static credentials, are continuously outpaced by more sophisticated criminal tactics. Modern Strong Customer Authentication solutions often incorporate advanced tools, such as:

  • Biometric authentication: Fingerprint scans, voice, and facial recognition technologies deliver added security and convenience.
  • Device intelligence: Leveraging customers’ trusted devices, like their smartphones, as a secure possession factor.
  • Context-aware and risk-based authentication: Utilizing behavioral analytics and real-time risk assessment to adapt authentication requirements to the level of risk.
Learn how to deliver a proactive approach to payment fraud prevention in our ebook: ‘Preventing emerging payment scams: A strategic guide for issuers’

Best practices for implementing Strong Customer Authentication
Successful SCA deployment requires more than the right technology. To maximize the impact for your organization, consider a holistic strategy that includes:

Seamless user experience

While compliance is non-negotiable, customer satisfaction remains a competitive differentiator. Streamlining customer journeys, integrating biometrics, and deploying frictionless step-up authentication minimizes drop-off and transaction abandonment rates. In addition, customer familiarity with one intuitive authentication method across all channels enhances both security and trust.

Layered authentication

Adopting layered authentication methods, such as combining device-based verification with thumbprint or face recognition, strikes a balance between robust security and effortless usability.

Regulatory vigilance

Staying up to date with standards, such as EMV 3-D Secure, FIDO, and the latest PSD2 guidelines is critical. Partnering with an innovative technology provider, like Entersekt, can help reduce the heavy lifting by ensuring continuous compliance.

Flexible integration and scalability

Solutions should offer straightforward integration with existing banking platforms and scale to support billions of secure transactions — all while reducing call center volumes and operational costs. Pre-built SDKs and APIs can streamline implementation, helping organizations achieve rapid time-to-value.
Frequently asked questions about Strong Customer Authentication
Q: What types of transactions require Strong Customer Authentication?

A: Any electronic payment or account access that could result in financial loss typically demands SCA compliance, especially within the EU. Exemptions may apply for low-risk or recurring payments.

Q: Is biometrics alone sufficient for SCA?

A: No. Biometrics can fulfill the “inherence” requirement, but another factor — either knowledge or possession — must also be included for true compliance.

Q: How do consumers benefit from advanced SCA?

A: SCA reduces exposure to fraud, makes unauthorized account access significantly harder, and builds greater confidence in digital services.
Towards a secure and seamless payment future
Banking and payment fraud is relentless, but so is innovation. Navigating the complexity of regulations like Strong Customer Authentication requires solutions that balance regulatory rigor with frictionless customer journeys — delivering security, trust, and business growth.

As new threats and requirements emerge, trusted technology providers, like Entersekt, can protect customers and maintain compliance through a multi-layered, context-based security approach. Our solutions enable banks to uniquely identify customers and secure every transaction, keeping friction to a minimum and aligning with regulatory requirements like SCA.