TL;DR: Banks are layering digital certificates, two-factor authentication, and out-of-band approval to secure online transactions and reduce fraud while supporting compliance, according to IdenTrust. The hard part is not adding more prompts, but proving identity reliably across channels and transaction steps.
At a glance
What this is: IdenTrust argues that online banking security now depends on identity-based authentication, digital certificates, and out-of-band approval rather than passwords alone.
Why it matters: For identity and security teams, the key issue is aligning authentication strength, transaction verification, and encrypted communications without creating gaps between channels.
Context
Online banking security is increasingly a question of identity assurance rather than simple login strength. Passwords can be reused, phished, or intercepted, while transaction approval often happens on a different device or channel than the initial sign-in, creating a governance gap between authentication and authorisation.
In financial services, the practical problem is not just proving that a customer is known once, but proving that the same verified identity is present across login, transaction approval, and encrypted communication. That makes identity-based authentication a banking control issue, an IAM issue, and a fraud-reduction issue at the same time.
Key questions
Q: How should banks reduce fraud without making online banking unusable?
A: Use layered authentication that combines verified identity, device trust, and transaction-specific approval. The goal is to reduce reliance on passwords alone while keeping the approval step tied to the actual banking action. That balance matters because effective fraud control in banking is about proving the right person is present at the right moment, not just making every login harder.
Q: Why do digital certificates matter in online banking security?
A: Digital certificates matter because they strengthen trust in both communication and identity validation. They help encrypt traffic, reduce interception risk, and support confidence that a session or endpoint is legitimate. Their value depends on lifecycle governance, including issuance, renewal, and revocation, so expired or unmanaged certificates do not become hidden weak points.
Q: What breaks when transaction approval is not separate from login?
A: When approval is not separated from login, a stolen session can become enough to authorise high-risk actions. Out-of-band authentication reduces that exposure only if the second channel is genuinely independent and transaction-specific. If the approval step is only a replay of the login step, the control adds friction without materially improving assurance.
Q: How can identity teams and fraud teams work together on gig risk?
A: They should share risk thresholds, escalation rules, and review triggers. IAM teams usually own the identity proofing flow, while fraud teams see patterns of abuse over time. If those groups do not coordinate, the platform ends up with separate partial views instead of one defensible trust model.
Technical breakdown
Why passwords are too weak for banking trust
Passwords establish a shared secret, not a durable identity assertion. In online banking, that is fragile because phishers, credential stuffing, and reused credentials can all bypass the first gate without proving the user is the real account holder. Identity-based authentication shifts the control from memorised secrets to stronger identity signals, often combining possession factors, verified devices, and cryptographic trust. That matters because the bank is not only authenticating a person, but also binding the session to a trusted identity posture across the transaction lifecycle.
Practical implication: treat password replacement as an identity assurance decision, not just an authentication UX change.
How digital certificates support authentication and encrypted communications
Digital certificates give online banking two functions at once: they help authenticate the user or device, and they secure traffic in transit. The certificate binds a public key to a verified identity, which allows the bank to validate who is connecting while also encrypting the session. In practice, that reduces reliance on static credentials and helps protect sensitive data as it moves between channels and platforms. For banks, certificate governance is therefore part of both access control and communications security, not a separate PKI exercise.
Practical implication: manage certificates as identity assets with lifecycle, revocation, and trust-chain controls.
Why out-of-band approval changes transaction risk
Out-of-band authentication adds a second, separate channel for approving access or transactions, usually through a mobile device or push prompt. The security value is that the approval path is detached from the primary session, so a compromised browser session alone is not enough to authorise payment activity. This control is especially relevant for higher-risk banking transactions because it creates a check on session hijack, phishing, and account takeover. The governance question is whether the second channel is genuinely independent and tightly scoped to the transaction being approved.
Practical implication: ensure transaction approvals are bound to the specific action and not treated as generic login confirmations.
Threat narrative
Attacker objective: The attacker wants to impersonate a legitimate customer well enough to authorise banking activity and move money or access sensitive account data.
- Entry begins with credential theft or reuse against a customer login path that still depends on passwords or weak reuse-prone factors.
- Credential abuse continues when the attacker can access the banking session without proving possession of the verified identity channel used for transaction approval.
- Impact occurs when the bank lacks separate approval and certificate-backed identity checks, allowing fraudulent transactions or sensitive-data exposure.
Breaches seen in the wild
- Zacks breach claim 2025: A hacker leaked 12 million Zacks accounts in 2025, claiming domain admin access in 2024; HIBP verified the data, Zacks has not confirmed.
Read and download The State of NHI & AI Agent Breach Report 2026, covering 200+ breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Identity assurance is becoming the real control plane for online banking. The article shows that banks are no longer trying to secure transactions with authentication alone. They are trying to prove identity across login, approval, and transport, which means the control boundary now spans IAM, fraud, and secure communications. For practitioners, the lesson is that banking security fails when those layers are governed separately.
Digital certificates are not just encryption plumbing, they are identity governance assets. Once certificates are used to validate users or devices, they become part of the trust fabric that determines who can transact and under what conditions. That puts lifecycle management, revocation, and trust-chain integrity into the same risk conversation as access policy. Practitioners should manage certificates as governed identity evidence, not infrastructure detail.
Out-of-band approval is only useful when the second channel is genuinely independent. If the approval path is too closely coupled to the primary session, the bank may only have the appearance of step-up control. The article’s layered approach reflects a broader shift toward transaction-specific assurance, which is especially important when the same actor can log in from one device and approve from another. Practitioners should test channel separation as rigorously as they test authentication strength.
Online banking now exposes a verification trust gap that conventional login controls do not close. The trust problem is not only whether a customer can sign in, but whether the bank can keep trust intact through the full transaction lifecycle. That makes the identity model more dynamic and more operationally demanding. Practitioners should map where verification ends and transaction authority begins, then close the gap with policy, device trust, and approval binding.
From our research library:
- 43% of security professionals are concerned about AI systems learning and reproducing sensitive information patterns from codebases, according to the State of Secrets in AppSec.
- Read next: Machine Identity, PKI and Certificate Lifecycle Guide
What this signals
Verification trust gap: banks increasingly need a control model that proves identity through the full transaction path, not just at sign-in. That changes how IAM, fraud monitoring, and encrypted communications should be governed together rather than as separate programmes.
The practical implication for financial institutions is that certificate lifecycle, device trust, and transaction approval now belong in the same risk review. If any one of those steps is weak, the bank may still have authentication, but it will not have durable identity assurance.
For practitioners
- Replace password-only banking access Move customer access toward identity-based authentication that combines verified possession factors, trusted devices, and stronger transaction assurance.
- Bind approvals to the transaction Require out-of-band approval that is specific to the payment or sensitive action being authorised, not a generic confirm button.
- Govern certificates as identity assets Track issuance, renewal, revocation, and trust-chain validation for any certificate used to authenticate users or secure banking communications.
- Test session and channel separation Validate that the login path, approval path, and encrypted communication layer are not sharing a single point of compromise.
Key takeaways
- The article points to a broader shift away from password-centred banking controls toward layered identity assurance.
- Digital certificates and out-of-band approval matter because they extend trust beyond the initial login event.
- Banks need governance that connects authentication, transaction authorisation, and encrypted communications across the full customer journey.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while NIST SP 800-63, NIST SP 800-53 Rev 5 and CSA Cloud Controls Matrix set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | SP 800-63B — Authentication | The article centres on stronger authentication for banking users and verified identities. |
| Recommendation — Apply SP 800-63B to strengthen authentication assurance and reduce dependence on passwords. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Certificate and factor lifecycle management are central to the banking controls described. |
| IA-8 — Identification and Authentication (Non-Organizational Users) | The article is about customer-facing banking identity assurance, not internal workforce access. | |
| Recommendation — Use IA-5 to govern authenticators, rotation, and revocation across banking identity flows. Apply IA-8 when external users must prove identity before accessing financial services. | ||
| CSA Cloud Controls Matrix | IAM — Identity and Access Management | The banking use case depends on governed identity controls across cloud-delivered transaction services. |
| Recommendation — Map banking identity controls to IAM and enforce consistent assurance across access paths. | ||
| MITRE ATT&CK | TA0006 — Credential Access | The threat model includes password theft and session abuse leading to account takeover. |
| Recommendation — Track credential theft patterns under TA0006 and prioritise controls that break reuse-based access. | ||
Key terms
- Identity-Based Authentication: Identity-based authentication verifies a specific person or subject rather than a pooled credential. In shared environments, it preserves accountability by keeping access tied to the individual even when the resource, workstation, or application is used by many people.
- Out-of-Band Authentication: Out-of-band authentication is a verification step completed through a separate channel such as SMS, email, or a mobile app. It can improve assurance, but it also introduces delay and failure risk. For identity governance, it matters because channel friction often causes users or operators to bypass stronger controls.
- Digital certificate: A cryptographic credential issued for a defined period that can be used to prove identity during authentication. It supports stronger, time-bound access control, but only when issuance, renewal, and revocation are managed as part of the identity lifecycle.
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Published by the NHIMG editorial team on July 11, 2026.
Updated on October 11, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org