Add open problems page (#72)

open-problems.md

@@ -1,5 +1,38 @@
-# Open research problems
+---
+title: Open Research Problems
+---
 
-This page is a stub. It will be filled out with open research problems.
+# Open Research Problems
 
-For now, please take a look at our open issues. For example in the [vacp2p/research repo](https://github.com/vacp2p/research/issues).
+We are seeking to collaborate with researchers in the following topic areas.
+Feel free to join our [Discord](https://discord.gg/PQFdubGt6d) for discussion.
+
+### DHT (distributed hash table) security / privacy / anonymity
+
+Compared to unstructured P2P overlay networks, DHTs offer efficient and (theoretically) reliable discovery.
+However, they are prone to eclipse attacks and [typically offer weak privacy properties](https://github.com/gpestana/notes/issues/8).
+This topic comprises researching novel techniques mitigating or even thwarting [eclipse attacks](https://www.gemini.com/cryptopedia/eclipse-attacks-defense-bitcoin#section-what-is-an-eclipse-attack) against DHTs.
+A focus on [Node Discovery Protocol v5 (discv5)](https://github.com/ethereum/devp2p/blob/master/discv5/discv5.md) is of special interest to the Vac team.
+
+Further background on the usage of discv5 in Waku can be found in our [research log](https://vac.dev/wakuv2-apd).
+A new version of discv5 that is both efficient and provides eclipse mitigation is [currently being researched](https://github.com/harnen/service-discovery-paper).
+
+
+### Privacy-Preserving Incentivizations of waku protocols
+
+* Incentivise relay
+
+### Devising novel applications of the Waku protocol stack
+
+examples comprise
+
+* p2p social network
+* evoting system
+
+### Waku simulator
+
+### Halo2 in a browser
+
+### Meshnet transports and libp2p
+
+### Applied ZK