DDoS attack: what is it and why does it matter for public-sector websites?
DDoS (from English Distributed Denial of Service) attack is a cyber attack in which a very large number of requests are sent to a website, system or service at the same time from many different devices. The aim is to overload the server or network infrastructure so that real users can no longer access the website, electronic services or self-service functions.
Simply put, the system is not being “hacked” in the literal sense — it is just being flooded with artificial traffic. As a result, residents may be unable to access important information, registration forms, document submission systems or other digital services. In the public sector, this can have a direct impact on service accessibility and the organisation’s reputation.
Why are DDoS attacks dangerous for municipalities, schools and cultural institutions?
Public-sector organisations in the EU – municipalities, schools, libraries, museums, public bodies – often provide information that residents need every day. If a municipality website becomes unavailable, residents may not be able to find up-to-date notices, council decisions, service registration or civil protection information.
In the case of schools and education organisations, disruptions can affect admissions information, teaching schedules, news for parents or online forms. For museums and libraries, a DDoS attack can mean a broken event registration system, disruption to digital catalogues or unavailability of ticketing systems. Even if the attack is short-lived, its impact on user trust can be significant.
How can you recognise a possible DDoS attack?
One of the most common signs is a website that suddenly becomes very slow or completely unavailable. Sometimes only certain functions stop working, for example search, form submissions or self-service login. At technical level, an unusually high level of traffic from many different IP addresses or regions is often visible.
It is important to understand that not every slowdown means an attack. For example, increased traffic after an important municipality announcement or during admissions season on a school website can also overload the system. That is why it is necessary to have monitoring tools that help distinguish normal traffic from malicious traffic.
Main protection measures
- CDN and traffic distribution. A content delivery network (CDN) helps distribute the load and serve users faster from different locations. For public-sector websites, this is especially useful because it helps not only improve performance but also reduce the risk that one server becomes an easy target.
- Firewalls and protection rules. A properly configured web application firewall (WAF) can filter suspicious traffic, block repeated malicious requests and protect the most important pages of the website. This is especially relevant for organisations that use forms, search, document systems or public registrations.
- Traffic limiting. Limiting the number of requests from one source over a certain period can reduce the impact of automated attacks. This measure helps protect login, search and form submission functions, which are often targeted in attacks.
- Specialised anti-DDoS services. Services such as Cloudflare or other similar solutions can automatically detect unusual traffic and filter it before it reaches the website server. For public bodies, this is often a practical way to strengthen protection without complex internal infrastructure expansion.
- Monitoring and response plan. Technical measures alone are not enough if the organisation does not have a clear action plan. It is important to know who is responsible for the response, how service providers are informed, where information for residents is published and how services are restored.
Accessibility and service continuity
For public-sector websites, security is important, but so is accessibility. If a website stops working because of a DDoS attack, residents may lose access to information that matters to them, including notices about services, deadlines or emergencies. Protection against such attacks is therefore also a question of digital accessibility and service continuity.
It is worth planning alternative communication channels: a backup information page, social media notices or other ways to inform residents about disruptions. This is especially relevant for municipalities, education organisations and cultural organisations that need to provide clear and timely information to different audiences.
GDPR and other compliance aspects
Although a DDoS attack is usually associated with service disruption rather than data theft, it can still affect an organisation’s compliance processes. If the attack disrupts system operation, the continuity of personal data processing, residents’ submission of requests or access to important services may be affected.
It is important for organisations to ensure that their IT providers, hosting partners and website maintenance teams have clearly defined responsibilities. This includes incident management, log retention, access control and response procedures. Such practice helps not only improve security, but also responsibly meet the GDPR and other requirements relevant to the public sector.
How to prepare in advance?
The most effective protection against DDoS attacks starts before an incident occurs. The website platform should be updated regularly, server configuration reviewed, the security of installed plugins assessed and the system tested to see how it behaves under increased traffic. It is also useful to have a clear contact list: the hosting provider, website developer, security partner and responsible staff members.
Public bodies should periodically review which website functions are critical. For example, for a municipality this may be residents’ request forms, for a school — admissions information, for a library — the catalogue, for a museum — event registration. Knowing the priorities makes it easier to plan protection and restore services faster.
A DDoS attack is not just a technical problem — it is a risk to the continuity of an organisation’s operations, communication and residents’ trust. That is why public-sector websites need a combination of technical protection measures, clear processes and reliable partners so that digital services remain available even when threats increase.