Turkish student team builds a blockchain layer to harden DNS and DHCP
Four Turkish engineers designed a distributed security layer that prevents stealthy DNS/DHCP attacks by decentralizing critical name and address records. The team—Ediz Ural, Özgür Pirli, Atahan Düryaz and Ahmet Atakan Okutan—spent about a year developing the prototype at Yeditepe University Teknokent and placed second in the TEKNOFEST 2026 Blockchain Competition out of roughly 17,600 people.
What problem does the system solve and why it matters
DNS and DHCP act as the internet’s address book and automatic IP allocator respectively. When attackers corrupt DNS records or hijack DHCP assignments, entire services can become unreachable; In 2016 a major DNS-based attack caused hours-long outages for platforms like Netflix and Facebook. The project replaces the single-point-of-failure model with a tamper-resistant, multi-node architecture so that a localized compromise cannot collapse resolution across the network.
How the blockchain layer works — architecture and steps
The team integrated DNS and DHCP record handling with a blockchain-backed registry. Key elements and process steps:
1. Record publication: When a device or administrator publishes a DNS or DHCP entry, the record is written to multiple geographically distributed nodes rather than a centralized server.
2. Consensus and immutability: Nodes reach consensus on valid records; once committed the blockchain provides immutable audit logs so changes require coordinated validation and unauthorized alterations stand out in the ledger.
3. Resolution flow: A resolver queries local nodes first, then falls back to other nodes; a validation layer cross-checks signatures and timestamps before returning an address to the client.
4. Failover and healing: If a node shows inconsistent state, other nodes provide authoritative data and a reconciliation routine patches the corrupted node while recording the event on-chain for forensic analysis.
Practical benefits with concrete examples
Decentralizing DNS/DHCP delivers measurable resilience: for example, if a regional node serving 20% of clients is attacked and taken offline, decentralized lookup reduces service loss to under 1% because clients can resolve addresses from alternate nodes. The blockchain’s immutable history shortens incident response time: teams can identify the exact block/time a change occurred and isolate the vector within minutes rather than hours. For enterprises with multiple sites, the architecture allows each branch to act as an authoritative mirror, simplifying maintenance and reducing dependency on single datacenter SLAs.
Security trade-offs and mitigation strategies
Introducing blockchain increases storage and verification overhead. The team mitigated these trade-offs by:
• Lightweight block headers: Storing compact headers and cryptographic proofs instead of full payloads on every node to reduce disk usage.
• Selective on-chain commitments: Only cryptographic hashes of DHCP leases and DNS zone changes are committed on-chain; the full records remain in encrypted off-chain stores accessible to authorized nodes.
• Rate-limiting and reputation: Nodes apply rate limits and maintain a reputation score to prevent flooding attacks and to preferentially trust historically consistent nodes during transient network partitions.
Step-by-step deployment checklist for organizations
To deploy a similar blockchain-backed DNS/DHCP system, follow these steps:
1. Baseline and inventory: Document current DNS/DHCP topology, zone files, lease patterns and client distribution.
2. Node placement planning: Choose geographically diverse nodes—at least three independent sites—for initial consensus quorum.
3. Cryptographic key management: Issue and distribute signing keys to administrators and automated processes; rotate keys on a scheduled cadence.
4. Integration layer: Implement a middleware that intercepts DNS/DHCP updates, computes a hash, pushes the hash to the blockchain, and writes the authoritative record to local stores.
5. Validation controls: Enforce signature checks, timestamp skew tolerance, and cross-node consistency checks on every client query.
6. Monitoring and incident playbooks: Log discrepancies on-chain, set alert thresholds for node divergence, and create automated reconciliation scripts.
Team insights and development process
The team developed the idea after encountering stealthy attacks during internships. They worked evenings and weekends for months to prototype integration between DNS/DHCP services and a permissioned blockchain. Their approach focused on practical, incremental changes—publishing only proofs on-chain and leaving full records encrypted off-chain—to keep latency low while retaining forensic integrity.
How this design affects end users and administrators
End users experience the benefit indirectly: faster recovery and fewer service outages. Administrators gain a clear audit trail and stronger verification tools for changes—reducing time spent chasing intermittent faults. Onboarding requires modest operational changes: adding a validation layer and key management, plus training for handling reconciliation events and interpreting blockchain audit entries.
Common questions and concise answers
Q: Will blockchain slow DNS lookups? A: No—lookups use local caches and nodes; blockchain commits occur asynchronously as compact proofs, so client latency remains comparable to traditional setups.
Q: Can attackers flood the blockchain? A: Rate-limiting, permissioned node networks, and reputation scoring prevent trivial flooding; critical records can require multi-signer approval to change.
Q: Is this compatible with existing DNS software? A: Yes—middleware adapts current DNS/DHCP servers to publish proofs and validate responses without replacing the stack.
Lessons learned and recommendations
Key lessons from the project include prioritizing minimal on-chain state to preserve performance, placing nodes to match client topology for resilience, and automating reconciliation to reduce human response times. Organizations should pilot with non-critical zones first, measure latency and storage impacts, then expand toward full production once performance is validated.
Why this approach stands out
By combining immutable audit trails, geographic distribution and selective on-chain commitments, the design defends against covert DNS/DHCP manipulations while keeping operational overhead manageable. The TEKNOFEST result validates the idea in a competitive field and demonstrates that practical blockchain applications can secure legacy internet infrastructure without wholesale replacement.
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