diff --git a/src/app/api/crypto/public-keys/all/route.js b/src/app/api/crypto/public-keys/all/route.js
index 5cb98470..cbede1ee 100644
--- a/src/app/api/crypto/public-keys/all/route.js
+++ b/src/app/api/crypto/public-keys/all/route.js
@@ -23,7 +23,9 @@ async function authenticateUser(request) {
 
 		const cookies = Object.fromEntries(
 			cookieHeader.split(/;\s*/).map((cookie) => {
-				const [name, value] = cookie.split('=');
+				const separator = cookie.indexOf('=');
+				const name = separator === -1 ? cookie : cookie.slice(0, separator);
+				const value = separator === -1 ? '' : cookie.slice(separator + 1);
 				return [name, decodeURIComponent(value)];
 			})
 		);
diff --git a/src/app/api/crypto/public-keys/all/route.test.js b/src/app/api/crypto/public-keys/all/route.test.js
new file mode 100644
index 00000000..93de6c82
--- /dev/null
+++ b/src/app/api/crypto/public-keys/all/route.test.js
@@ -0,0 +1,44 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+const mocks = vi.hoisted(() => ({
+	 authGetUser: vi.fn(),
+	 from: vi.fn(),
+}));
+
+vi.mock('@supabase/supabase-js', () => ({
+	createClient: vi.fn(() => ({
+		auth: { getUser: mocks.authGetUser },
+		from: mocks.from,
+	})),
+}));
+
+describe('all public keys cookie authentication', () => {
+	beforeEach(() => {
+		vi.resetModules();
+		vi.clearAllMocks();
+		process.env.NEXT_PUBLIC_SUPABASE_URL = 'https://example.supabase.co';
+		process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY = 'anon-key';
+		process.env.SUPABASE_SERVICE_ROLE_KEY = 'service-key';
+		mocks.authGetUser.mockResolvedValue({ data: { user: { id: 'auth-user-id' } }, error: null });
+		mocks.from.mockReturnValue({
+			select: vi.fn(() => ({
+				not: vi.fn(() => Promise.resolve({ data: [{ user_id: 'user-1', public_key: 'key-1' }], error: null })),
+			})),
+		});
+	});
+
+	it('preserves equals padding in base64 auth cookies', async () => {
+		const { GET } = await import('./route.js');
+		const response = await GET(
+			new Request('https://qrypt.chat/api/crypto/public-keys/all', {
+				headers: {
+					cookie: 'sb-xydzwxwsbgmznthiiscl-auth-token=base64-eyJhY2Nlc3NfdG9rZW4iOiJhYmMiLCJwYWRkaW5nIjoieCJ9==',
+				},
+			}),
+		);
+
+		expect(response.status).toBe(200);
+		expect(await response.json()).toEqual([{ user_id: 'user-1', public_key: 'key-1' }]);
+		expect(mocks.authGetUser).toHaveBeenCalledWith('abc');
+	});
+});
diff --git a/src/app/api/crypto/public-keys/route.js b/src/app/api/crypto/public-keys/route.js
index 29166cbe..adc35c8b 100644
--- a/src/app/api/crypto/public-keys/route.js
+++ b/src/app/api/crypto/public-keys/route.js
@@ -33,7 +33,9 @@ async function authenticateUser(request) {
 		// Parse cookies to find auth token
 		const cookies = Object.fromEntries(
 			cookieHeader.split(/;\s*/).map(cookie => {
-				const [name, value] = cookie.split('=');
+				const separator = cookie.indexOf('=');
+				const name = separator === -1 ? cookie : cookie.slice(0, separator);
+				const value = separator === -1 ? '' : cookie.slice(separator + 1);
 				return [name, decodeURIComponent(value)];
 			})
 		);
diff --git a/src/app/api/crypto/public-keys/route.test.js b/src/app/api/crypto/public-keys/route.test.js
index 9e021418..74987a85 100644
--- a/src/app/api/crypto/public-keys/route.test.js
+++ b/src/app/api/crypto/public-keys/route.test.js
@@ -25,6 +25,10 @@ function cookieValue(token) {
 	return `base64-${Buffer.from(JSON.stringify({ access_token: token })).toString('base64')}`;
 }
 
+function paddedCookieValue() {
+	return 'base64-eyJhY2Nlc3NfdG9rZW4iOiJhYmMiLCJwYWRkaW5nIjoieCJ9==';
+}
+
 function createUsersQuery() {
 	let selected = '';
 	const query = {
@@ -83,6 +87,20 @@ describe('public key cookie authentication', () => {
 		expect(mocks.authGetUser).toHaveBeenCalledWith('access-token');
 	});
 
+	it('preserves equals padding in base64 auth cookies', async () => {
+		const { GET } = await import('./route.js');
+		const response = await GET(
+			new Request('https://qrypt.chat/api/crypto/public-keys?user_id=target-user-id', {
+				headers: {
+					cookie: `sb-xydzwxwsbgmznthiiscl-auth-token=${paddedCookieValue()}`
+				}
+			})
+		);
+
+		expect(response.status).toBe(200);
+		expect(mocks.authGetUser).toHaveBeenCalledWith('abc');
+	});
+
 	it('rejects non-string public keys before upsert RPC work', async () => {
 		const { PUT } = await import('./route.js');
 		const response = await PUT(