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Account Takeover: The Defense in Depth Strategy

Published: December 22, 2020 by Guest Contributor

Preventing account takeover (ATO) fraud is paramount in today’s increasingly digital world. In this two-part series, we’ll explore the benefits and considerations of a Defense in Depth strategy for stopping ATO.

The challenges with preventing account takeover

Historically, managing fraud and identity risk in online banking has been a trade-off between customer experience and the effectiveness of fraud controls. The basic control structure relies on a lock on the front door of online banking front door—login—as the primary authentication control to defend against ATO.

Within this structure, there are two choices. The first is tightening the lock, which equals a higher rate of step-up authentication challenges and lower fraud losses. The second is loosening the lock, which results in a lower challenge rate and higher fraud loses. Businesses can layer in more controls to reduce the false positives, but that only allows marginal efficiency increases and usually represents a significant expense in both time and budget to add in new controls.

Now is the perfect time for businesses reassess their online banking authentication strategy for a multitude of reasons:

  • ATO is on the rise: According to Javelin Strategy & Research, ATO increased 72% in 2019.1
  • Users’ identities and credentials are at more risk than ever before: Spear phishing and data breaches are now a fact of life leading to reduced effectiveness of traditional authentication controls.
  • Online banking enrollments are on the rise: According to BioCatch, in the months following initial shelter-in-place orders across the country, banks have seen a massive spike in first time online banking access.
  • Users expect security in online banking: Half of consumers continue to cite security as the most important factor in their online experience.

Businesses who reassess the control structure for their online banking will increase the effectiveness of their tools and reduce the number of customers challenged at the same time – giving them Defense in Depth.

What is Defense in Depth?

Defense in Depth refers to a strategy in which a series of defense mechanisms are layered in order to protect data and information.

The basic assumptions underlying the value of a Defense in Depth strategy are:

  • Different types of transactions within online banking have different levels of inherent risk (e.g., external money movement is considerably higher risk compared to viewing recent credit card transactions)
  • At login, the overall transaction risk associated with the session risk is unknown
  • The risk associated with online banking is concentrated in relatively small populations – the vast majority of digital transactions are low risk

This is the Pareto principle at play – i.e., about 80% of online banking risk is concentrated within about 20% of sessions. Experian research shows that risk is even more concentrated – closer to >90% of the risk is concentrated in <10% of transactions. This is relatively intuitive, as the most common activities within online banking consist of users checking their balance or reviewing recent transactions. It is much less common for customers to engage in higher risk transaction. The challenge is that businesses cannot know the session risk at the time of challenge, thus their efficiency is destined to be sub-optimal.

The benefits of Defense in Depth

A Defense in Depth strategy can really change the economics of an online banking security program. Adopting a strategy that continuously assesses the overall session risk as a user navigates through their session allows more efficient risk decisions at moments that matter most to the user. With that increased efficiency, businesses are better set up to prevent fraud without frustrating legitimate users.

Defense in Depth allows businesses to intelligently layer security protocols to protect against vulnerability – helping to prevent theft and reputational losses and minimize end-user frustration. In addition to these benefits, a continuous risk-based approach can have lower overall operational costs than a traditional security approach.

The second part of this series will explore the cost considerations associated with the Defense in Depth strategy explored above. In the meantime, feel free to reach out to discuss options.

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1Identity Fraud in the Digital Age, Javelin Strategy & Research, September 2020

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As data breaches become an ever-growing threat to businesses, the role of employees in maintaining cybersecurity has never been more critical. Did you know that 82% of data breaches involve the human element1 , such as phishing, stolen credentials, or social engineering tactics? These statistics reveal a direct connection between employee identity theft and business vulnerabilities. In this blog, we’ll explore why protecting your employees’ identities is essential to reducing data breach risk, how employee-focused identity protection programs, and specifically employee identity protection, improve both cybersecurity and employee engagement, and how businesses can implement comprehensive solutions to safeguard sensitive data and enhance overall workforce well-being. The Rising Challenge: Data Breaches and Employee Identity Theft The past few years have seen an exponential rise in data breaches. According to the Identity Theft Resource Center, there were 1,571 data compromises in the first half of 2024, impacting more than 1.1 billion individuals – a 490% increase year over year2. A staggering proportion of these breaches originated from compromised employee credentials or phishing attacks. Explore Experian's Employee Benefits Solutions The Link Between Employee Identity Theft and Cybersecurity Risks Phishing and Social EngineeringPhishing attacks remain one of the top strategies used by cybercriminals. These attacks often target employees by exploiting personal information stolen through identity theft. For example, a cybercriminal who gains access to an employee's compromised email or social accounts can use this information to craft realistic phishing messages, tricking them into divulging sensitive company credentials. Compromised Credentials as Entry PointsCompromised employee credentials were responsible for 16% of breaches and were the costliest attack vector, averaging $4.5 million per breach3. When an employee’s identity is stolen, it can give hackers a direct line to your company’s network, jeopardizing sensitive data and infrastructure. The Cost of DowntimeBeyond the financial impact, data breaches disrupt operations, erode customer trust, and harm your brand. For businesses, the average downtime from a breach can last several weeks – time that could otherwise be spent growing revenue and serving clients. Why Businesses Need to Prioritize Employee Identity Protection Protecting employee identities isn’t just a personal benefit – it’s a strategic business decision. Here are three reasons why identity protection for employees is essential to your cybersecurity strategy: 1. Mitigate Human Risk in Cybersecurity Employee mistakes, often resulting from phishing scams or misuse of credentials, are a leading cause of breaches. By equipping employees with identity protection services, businesses can significantly reduce the likelihood of stolen information being exploited by fraudsters and cybercriminals. 2. Boost Employee Engagement and Financial Wellness Providing identity protection as part of an employee benefits package signals that you value your workforce’s security and well-being. Beyond cybersecurity, offering such protections can enhance employee loyalty, reduce stress, and improve productivity. Employers who pair identity protection with financial wellness tools can empower employees to monitor their credit, secure their finances, and protect against fraud, all of which contribute to a more engaged workforce. 3. Enhance Your Brand Reputation A company’s cybersecurity practices are increasingly scrutinized by customers, stakeholders, and regulators. When you demonstrate that you prioritize not just protecting your business, but also safeguarding your employees’ identities, you position your brand as a leader in security and trustworthiness. Practical Strategies to Protect Employee Identities and Reduce Data Breach Risk How can businesses take actionable steps to mitigate risks and protect their employees? Here are some best practices: Offer Comprehensive Identity Protection Solutions A robust identity protection program should include: Real-time monitoring for identity theft Alerts for suspicious activity on personal accounts Data and device protection to protect personal information and devices from identity theft, hacking and other online threats Fraud resolution services for affected employees Credit monitoring and financial wellness tools Leading providers like Experian offer customizable employee benefits packages that provide proactive identity protection, empowering employees to detect and resolve potential risks before they escalate. Invest in Employee Education and Training Cybersecurity is only as strong as your least-informed employee. Provide regular training sessions and provide resources to help employees recognize phishing scams, understand the importance of password hygiene, and learn how to avoid oversharing personal data online. 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