diff --git a/package-lock.json b/package-lock.json
index 48d06c8..72ccdd9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,8 @@
       "version": "1.5.0",
       "license": "MIT",
       "dependencies": {
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         "node-datachannel": "^0.29.0",
         "ws": "^8.18.3"
       },
@@ -27,6 +29,8 @@
     },
     "node_modules/@biomejs/biome": {
       "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@biomejs/biome/-/biome-2.2.0.tgz",
+      "integrity": "sha512-3On3RSYLsX+n9KnoSgfoYlckYBoU6VRM22cw1gB4Y0OuUVSYd/O/2saOJMrA4HFfA1Ff0eacOvMN1yAAvHtzIw==",
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       "license": "MIT OR Apache-2.0",
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@@ -50,7 +54,24 @@
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       }
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-    "node_modules/@biomejs/biome/node_modules/@biomejs/cli-darwin-x64": {
+    "node_modules/@biomejs/cli-darwin-arm64": {
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+      "resolved": "https://registry.npmjs.org/@biomejs/cli-darwin-arm64/-/cli-darwin-arm64-2.2.0.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT OR Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
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@@ -67,7 +88,7 @@
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-    "node_modules/@biomejs/biome/node_modules/@biomejs/cli-linux-arm64": {
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@@ -101,7 +122,7 @@
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@@ -118,7 +139,7 @@
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-    "node_modules/@biomejs/biome/node_modules/@biomejs/cli-linux-x64-musl": {
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@@ -169,23 +190,31 @@
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-      ],
-      "dev": true,
-      "license": "MIT OR Apache-2.0",
-      "optional": true,
-      "os": [
-        "darwin"
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+      "resolved": "https://registry.npmjs.org/@noble/ed25519/-/ed25519-2.3.0.tgz",
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+      "license": "MIT",
+      "funding": {
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+      }
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+    "node_modules/@noble/hashes": {
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+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "license": "MIT",
       "engines": {
-        "node": ">=14.21.3"
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
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+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.3.0.tgz",
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@@ -194,6 +223,8 @@
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+      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
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@@ -202,6 +233,8 @@
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+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
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@@ -220,6 +253,8 @@
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@@ -229,6 +264,8 @@
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@@ -251,10 +288,14 @@
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       "license": "ISC"
     },
     "node_modules/decompress-response": {
       "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-6.0.0.tgz",
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@@ -268,6 +309,8 @@
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+      "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
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@@ -275,6 +318,8 @@
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       "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.0.4.tgz",
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@@ -282,6 +327,8 @@
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+      "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.5.tgz",
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@@ -289,6 +336,8 @@
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@@ -296,14 +345,20 @@
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     "node_modules/napi-build-utils": {
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@@ -509,6 +598,8 @@
     },
     "node_modules/string_decoder": {
       "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
       "license": "MIT",
       "dependencies": {
         "safe-buffer": "~5.2.0"
@@ -516,6 +607,8 @@
     },
     "node_modules/strip-json-comments": {
       "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
       "license": "MIT",
       "engines": {
         "node": ">=0.10.0"
@@ -523,6 +616,8 @@
     },
     "node_modules/tar-fs": {
       "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.3.tgz",
+      "integrity": "sha512-090nwYJDmlhwFwEW3QQl+vaNnxsO2yVsd45eTKRBzSzu+hlb1w2K9inVq5b0ngXuLVqQ4ApvsUHHnu/zQNkWAg==",
       "license": "MIT",
       "dependencies": {
         "chownr": "^1.1.1",
@@ -533,6 +628,8 @@
     },
     "node_modules/tar-stream": {
       "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
       "license": "MIT",
       "dependencies": {
         "bl": "^4.0.3",
@@ -547,6 +644,8 @@
     },
     "node_modules/tunnel-agent": {
       "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
       "license": "Apache-2.0",
       "dependencies": {
         "safe-buffer": "^5.0.1"
@@ -557,6 +656,8 @@
     },
     "node_modules/typescript": {
       "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.2.tgz",
+      "integrity": "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
@@ -569,19 +670,27 @@
     },
     "node_modules/undici-types": {
       "version": "7.10.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.10.0.tgz",
+      "integrity": "sha512-t5Fy/nfn+14LuOc2KNYg75vZqClpAiqscVvMygNnlsHBFpSXdJaYtXMcdNLpl/Qvc3P2cB3s6lOV51nqsFq4ag==",
       "dev": true,
       "license": "MIT"
     },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "license": "MIT"
     },
     "node_modules/wrappy": {
       "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "license": "ISC"
     },
     "node_modules/ws": {
       "version": "8.18.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"
diff --git a/package.json b/package.json
index 2e8b677..c5d4561 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,8 @@
     "tidy": "biome check --write . && biome lint --write ."
   },
   "dependencies": {
+    "@noble/ed25519": "^2.3.0",
+    "@noble/hashes": "^1.8.0",
     "node-datachannel": "^0.29.0",
     "ws": "^8.18.3"
   },
diff --git a/src/types.ts b/src/types.ts
index 7f7547a..0a0c9cb 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -157,11 +157,16 @@ export interface WebSocketMessage {
     | 'log';
   role?: 'appender' | 'reader';
   // Zero-knowledge auth fields
+  // v1 (HMAC)
   proof?: string;
+  // v2 (Ed25519)
+  pubkey?: string;
+  sig?: string;
+  // challenge + metadata
   nonce?: string;
   timestamp?: number;
-  algo?: 'hmac-sha256';
-  version?: 'v1';
+  algo?: 'hmac-sha256' | 'ed25519';
+  version?: 'v1' | 'v2';
   /** Default fields included with all logs for this session. */
   defaultFields?: Record<string, unknown>;
   /** Optional log payload when using log-level signaling. */
diff --git a/src/webrtc-connection.ts b/src/webrtc-connection.ts
index 92187bd..eef27c2 100644
--- a/src/webrtc-connection.ts
+++ b/src/webrtc-connection.ts
@@ -10,6 +10,14 @@
 
 import * as nodeDataChannel from 'node-datachannel';
 import { createHmac } from 'crypto';
+import * as ed from '@noble/ed25519';
+import { sha512 } from '@noble/hashes/sha512';
+// Ensure noble-ed25519 hashing is configured
+// @ts-ignore
+if (!ed.etc.sha512Sync) {
+  // @ts-ignore
+  ed.etc.sha512Sync = (...m: Uint8Array[]) => sha512(ed.etc.concatBytes(...m));
+}
 import { WebSocket } from 'ws';
 import type {
   ConnectionInfo,
@@ -513,26 +521,45 @@ export function WebRTCManager(): WebRTCManager {
 
 // Helper functions for message handling
 /** Dispatch signaling messages from the server. @internal */
-function handleMessage(
+async function handleMessage(
   state: WebRTCManagerState,
   message: WebSocketMessage,
   resolve?: (value: undefined) => void,
   reject?: (reason: Error) => void
-): void {
+): Promise<void> {
   switch (message.type) {
     case 'auth_challenge': {
-      const { nonce, timestamp } = message as unknown as { nonce: string; timestamp: number };
+      const { nonce, timestamp, version, algo } = message as unknown as {
+        nonce: string;
+        timestamp: number;
+        version?: 'v1' | 'v2';
+        algo?: 'hmac-sha256' | 'ed25519';
+      };
       if (!state.myRole || !state.myPublicToken || !state.myKeyHex) {
         console.error('Missing connection details for auth proof');
         return;
       }
-      const payload = `openpull-auth|v1|${state.myPublicToken}|${state.myRole}|${nonce}|${timestamp}`;
-      const proof = createHmac('sha256', Buffer.from(state.myKeyHex, 'hex')).update(payload).digest('hex');
-      const authMessage: WebSocketMessage = {
-        type: 'auth',
-        role: state.myRole,
-        proof,
-      };
+      const v: 'v1' | 'v2' = version || (algo === 'ed25519' ? 'v2' : 'v1');
+      const payload = `openpull-auth|${v}|${state.myPublicToken}|${state.myRole}|${nonce}|${timestamp}`;
+
+      let authMessage: WebSocketMessage;
+      if (v === 'v2' || algo === 'ed25519') {
+        try {
+          const enc = new TextEncoder();
+          const pub = await ed.getPublicKey(state.myKeyHex);
+          const sig = await ed.sign(enc.encode(payload), state.myKeyHex);
+          const toHex = (u8: Uint8Array) => Buffer.from(u8).toString('hex');
+          authMessage = { type: 'auth', role: state.myRole, version: 'v2', pubkey: toHex(pub), sig: toHex(sig) };
+        } catch (e) {
+          console.error('Failed to sign v2 auth payload:', e);
+          return;
+        }
+      } else {
+        const proof = createHmac('sha256', Buffer.from(state.myKeyHex, 'hex'))
+          .update(payload)
+          .digest('hex');
+        authMessage = { type: 'auth', role: state.myRole, proof, version: 'v1', algo: 'hmac-sha256' };
+      }
       if (state.defaultFields && Object.keys(state.defaultFields).length > 0) {
         authMessage.defaultFields = state.defaultFields;
       }