vac acz roadmap update

Signed-off-by: ksr <kaiserd@users.noreply.github.com>

content/roadmap/vac/acz/overview.md

@@ -3,8 +3,8 @@ title: Applied Cryptography and Zero-knowledge Service Unit
 tags:
 - acz
 - vac
-date: 2023-08-25
-lastmod: 2023-09-06
+date: 2023-09-12
+lastmod: 2023-09-12
 ---
 
 ## `vac:acz:`
@@ -21,3 +21,6 @@ lastmod: 2023-09-06
 ### `zerokit:vac:`
 * [[roadmap/vac/acz/zerokit/vac/zerokit-v0-4 | zerokit-v0.4]]
 * [[roadmap/vac/acz/zerokit/vac/maintenance | maintenance]]
+
+### `secure-channels:waku:`
+* [[roadmap/vac/acz/secure-channels/waku/ethereum-chat | ethereum-chat]]

content/roadmap/vac/acz/secure-channels/waku/ethereum-chat.md

@@ -0,0 +1,56 @@
+---
+title: "Ethereum Chat"
+---
+## `vac:acz:secure-channels:waku:ethereum-chat`
+---
+
+```mermaid
+%%{ 
+  init: { 
+    'theme': 'base', 
+    'themeVariables': { 
+      'primaryColor': '#BB2528', 
+      'primaryTextColor': '#fff', 
+      'primaryBorderColor': '#7C0000', 
+      'lineColor': '#F8B229', 
+      'secondaryColor': '#006100', 
+      'tertiaryColor': '#fff' 
+    } 
+  } 
+}%%
+gantt
+  tickInterval 1month
+  dateFormat YYYY-MM-DD 
+  section Status
+    Ethereum Chat: 2023-09-12, 2023-11-31
+```
+
+- status: 0%
+- CC: Ramses
+
+### Description
+
+The goal of this milestone is having 
+
+* using the [noise](http://noiseprotocol.org/noise.html) framework
+* Ethereum Wallet address used to derive authentication key for noise
+* expand this https://rfc.vac.dev/spec/20/
+* Design an Ethereum address-based 1:1 chat
+  - should be transport agnostic
+  - toy eth chat: https://rfc.vac.dev/spec/20/
+    - this milestone requires forward secrecy
+* Naive Groupchat functionality (using `n` 1:1 chat channels)
+* involve metamask here (metamask im team)
+
+* a follow up milestone will cover run Ethereum chat on top of Waku
+* follow up goal: develop this into an EIP
+
+
+### Justification
+
+
+### Deliverables
+
+* specification (RFC) of a secure Ethereum-based chat protocol
+
+