diff --git a/apps/mana/apps/web/src/lib/data/crypto/aes.test.ts b/apps/mana/apps/web/src/lib/data/crypto/aes.test.ts
new file mode 100644
index 000000000..c6e826ca6
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/data/crypto/aes.test.ts
@@ -0,0 +1,285 @@
+/**
+ * AES-GCM wrap/unwrap primitive tests.
+ *
+ * Runs against the native Web Crypto API exposed on `globalThis.crypto`
+ * by Node 20+. No Dexie or fake-indexeddb needed — these are pure
+ * functions over the standard subtle crypto interface.
+ */
+
+import { describe, it, expect, beforeAll } from 'vitest';
+import {
+	wrapValue,
+	unwrapValue,
+	isEncrypted,
+	generateMasterKey,
+	importMasterKey,
+	exportMasterKey,
+	ENC_PREFIX,
+} from './aes';
+import { MemoryKeyProvider, setKeyProvider, getActiveKey, isVaultUnlocked } from './key-provider';
+import {
+	getEncryptedFields,
+	hasAnyEncryption,
+	getRegisteredTables,
+	ENCRYPTION_REGISTRY,
+} from './registry';
+
+let key: CryptoKey;
+let otherKey: CryptoKey;
+
+beforeAll(async () => {
+	key = await generateMasterKey();
+	otherKey = await generateMasterKey();
+});
+
+describe('isEncrypted', () => {
+	it('detects the encryption prefix', () => {
+		expect(isEncrypted('enc:1:abc.def')).toBe(true);
+	});
+
+	it('rejects non-string values', () => {
+		expect(isEncrypted(null)).toBe(false);
+		expect(isEncrypted(undefined)).toBe(false);
+		expect(isEncrypted(42)).toBe(false);
+		expect(isEncrypted({})).toBe(false);
+		expect(isEncrypted([])).toBe(false);
+	});
+
+	it('rejects strings without the prefix', () => {
+		expect(isEncrypted('hello world')).toBe(false);
+		expect(isEncrypted('')).toBe(false);
+		expect(isEncrypted('enc:')).toBe(false);
+		expect(isEncrypted('enc:2:abc.def')).toBe(false); // wrong version
+	});
+});
+
+describe('wrapValue / unwrapValue roundtrip', () => {
+	it('roundtrips a plain string', async () => {
+		const blob = await wrapValue('Buy milk', key);
+		expect(typeof blob).toBe('string');
+		expect((blob as string).startsWith(ENC_PREFIX)).toBe(true);
+		expect(await unwrapValue(blob, key)).toBe('Buy milk');
+	});
+
+	it('roundtrips an empty string', async () => {
+		const blob = await wrapValue('', key);
+		expect(await unwrapValue(blob, key)).toBe('');
+	});
+
+	it('roundtrips a unicode string', async () => {
+		const original = 'Schlüssel — 日本語 — 🔐 — ☃';
+		const blob = await wrapValue(original, key);
+		expect(await unwrapValue(blob, key)).toBe(original);
+	});
+
+	it('roundtrips an object', async () => {
+		const original = { title: 'Meeting', attendees: ['Alice', 'Bob'], priority: 2 };
+		const blob = await wrapValue(original, key);
+		expect(await unwrapValue(blob, key)).toEqual(original);
+	});
+
+	it('roundtrips an array', async () => {
+		const original = [1, 'two', { three: true }, null];
+		const blob = await wrapValue(original, key);
+		expect(await unwrapValue(blob, key)).toEqual(original);
+	});
+
+	it('roundtrips a number', async () => {
+		const blob = await wrapValue(42, key);
+		expect(await unwrapValue(blob, key)).toBe(42);
+	});
+
+	it('roundtrips a boolean', async () => {
+		const trueBlob = await wrapValue(true, key);
+		const falseBlob = await wrapValue(false, key);
+		expect(await unwrapValue(trueBlob, key)).toBe(true);
+		expect(await unwrapValue(falseBlob, key)).toBe(false);
+	});
+
+	it('roundtrips a large string (10KB)', async () => {
+		const large = 'x'.repeat(10_000);
+		const blob = await wrapValue(large, key);
+		expect(await unwrapValue(blob, key)).toBe(large);
+	});
+
+	it('passes null through unchanged on wrap', async () => {
+		expect(await wrapValue(null, key)).toBe(null);
+	});
+
+	it('passes undefined through unchanged on wrap', async () => {
+		expect(await wrapValue(undefined, key)).toBe(undefined);
+	});
+
+	it('passes plaintext strings through unchanged on unwrap', async () => {
+		expect(await unwrapValue('not encrypted', key)).toBe('not encrypted');
+	});
+
+	it('passes null/undefined through unchanged on unwrap', async () => {
+		expect(await unwrapValue(null, key)).toBe(null);
+		expect(await unwrapValue(undefined, key)).toBe(undefined);
+	});
+});
+
+describe('IV uniqueness', () => {
+	it('produces a different ciphertext for the same plaintext on each call', async () => {
+		const a = await wrapValue('same input', key);
+		const b = await wrapValue('same input', key);
+		const c = await wrapValue('same input', key);
+		expect(a).not.toBe(b);
+		expect(b).not.toBe(c);
+		expect(a).not.toBe(c);
+		// All three still decrypt to the same value
+		expect(await unwrapValue(a, key)).toBe('same input');
+		expect(await unwrapValue(b, key)).toBe('same input');
+		expect(await unwrapValue(c, key)).toBe('same input');
+	});
+});
+
+describe('wrong key rejection', () => {
+	it('throws when the wrong key tries to decrypt', async () => {
+		const blob = await wrapValue('secret', key);
+		await expect(unwrapValue(blob, otherKey)).rejects.toThrow();
+	});
+});
+
+describe('tampered ciphertext rejection', () => {
+	it('throws when the ciphertext bytes are flipped', async () => {
+		const blob = (await wrapValue('secret', key)) as string;
+		// Flip the last character to corrupt the auth tag
+		const lastChar = blob.charAt(blob.length - 1);
+		const swapChar = lastChar === 'A' ? 'B' : 'A';
+		const tampered = blob.slice(0, -1) + swapChar;
+		await expect(unwrapValue(tampered, key)).rejects.toThrow();
+	});
+});
+
+describe('malformed blob handling', () => {
+	it('throws when the iv/ct separator is missing', async () => {
+		await expect(unwrapValue('enc:1:noSeparatorHere', key)).rejects.toThrow(
+			/missing iv\/ct separator/
+		);
+	});
+});
+
+describe('importMasterKey / exportMasterKey', () => {
+	it('roundtrips a key through raw bytes', async () => {
+		const exported = await exportMasterKey(key);
+		expect(exported.length).toBe(32);
+
+		const reimported = await importMasterKey(exported);
+		// Use the reimported key to decrypt something the original encrypted
+		const blob = await wrapValue('roundtrip via raw bytes', key);
+		expect(await unwrapValue(blob, reimported)).toBe('roundtrip via raw bytes');
+	});
+
+	it('rejects raw input that is not 32 bytes', async () => {
+		await expect(importMasterKey(new Uint8Array(16))).rejects.toThrow(/32-byte/);
+		await expect(importMasterKey(new Uint8Array(64))).rejects.toThrow(/32-byte/);
+	});
+});
+
+describe('KeyProvider', () => {
+	it('NullKeyProvider is the default and reports locked', () => {
+		// Re-set to default explicitly in case a previous test left state
+		setKeyProvider(
+			new (class {
+				getKey() {
+					return null;
+				}
+				isUnlocked() {
+					return false;
+				}
+				onChange() {
+					return () => {};
+				}
+			})()
+		);
+		expect(getActiveKey()).toBe(null);
+		expect(isVaultUnlocked()).toBe(false);
+	});
+
+	it('MemoryKeyProvider holds a key and reports unlocked', async () => {
+		const provider = new MemoryKeyProvider();
+		expect(provider.isUnlocked()).toBe(false);
+		expect(provider.getKey()).toBe(null);
+
+		provider.setKey(key);
+		expect(provider.isUnlocked()).toBe(true);
+		expect(provider.getKey()).toBe(key);
+
+		provider.setKey(null);
+		expect(provider.isUnlocked()).toBe(false);
+	});
+
+	it('MemoryKeyProvider notifies listeners on lock/unlock transitions', () => {
+		const provider = new MemoryKeyProvider();
+		const events: boolean[] = [];
+		const dispose = provider.onChange((unlocked) => events.push(unlocked));
+
+		provider.setKey(key);
+		provider.setKey(key); // no transition — should not fire
+		provider.setKey(null);
+		provider.setKey(null); // no transition — should not fire
+		provider.setKey(key);
+
+		expect(events).toEqual([true, false, true]);
+		dispose();
+
+		// After dispose, no more notifications
+		provider.setKey(null);
+		expect(events).toEqual([true, false, true]);
+	});
+
+	it('setKeyProvider swaps the active provider', async () => {
+		const provider = new MemoryKeyProvider();
+		provider.setKey(key);
+		setKeyProvider(provider);
+
+		expect(isVaultUnlocked()).toBe(true);
+		expect(getActiveKey()).toBe(key);
+
+		// Reset for next tests
+		provider.setKey(null);
+		expect(isVaultUnlocked()).toBe(false);
+	});
+});
+
+describe('encryption registry', () => {
+	it('returns null for tables not in the registry', () => {
+		expect(getEncryptedFields('not_a_real_table')).toBe(null);
+	});
+
+	it('returns null for registered tables that are disabled', () => {
+		// Phase 1: every entry is enabled:false
+		expect(getEncryptedFields('messages')).toBe(null);
+		expect(getEncryptedFields('notes')).toBe(null);
+		expect(getEncryptedFields('contacts')).toBe(null);
+	});
+
+	it('hasAnyEncryption returns false in Phase 1', () => {
+		expect(hasAnyEncryption()).toBe(false);
+	});
+
+	it('getRegisteredTables lists every table in the registry', () => {
+		const tables = getRegisteredTables();
+		// Spot-check the most sensitive ones
+		expect(tables).toContain('messages');
+		expect(tables).toContain('notes');
+		expect(tables).toContain('memos');
+		expect(tables).toContain('contacts');
+		expect(tables).toContain('cycleDayLogs');
+	});
+
+	it('every registry entry has a non-empty fields list', () => {
+		for (const [table, config] of Object.entries(ENCRYPTION_REGISTRY)) {
+			expect(config.fields.length, `${table} has empty fields list`).toBeGreaterThan(0);
+		}
+	});
+
+	it('field lists contain no duplicates', () => {
+		for (const [table, config] of Object.entries(ENCRYPTION_REGISTRY)) {
+			const unique = new Set(config.fields);
+			expect(unique.size, `${table} has duplicate field names`).toBe(config.fields.length);
+		}
+	});
+});
diff --git a/apps/mana/apps/web/src/lib/data/crypto/aes.ts b/apps/mana/apps/web/src/lib/data/crypto/aes.ts
new file mode 100644
index 000000000..031ff9a3f
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/data/crypto/aes.ts
@@ -0,0 +1,186 @@
+/**
+ * AES-GCM-256 wrap/unwrap primitives.
+ *
+ * Pure crypto layer with no state and no Dexie dependency. The higher-level
+ * registry/key-provider modules use these to encrypt configured fields on
+ * the way into IndexedDB and decrypt them on the way out.
+ *
+ * Wire format
+ *   `enc:${VERSION}:${base64(iv)}.${base64(ct)}`
+ *
+ * The string-prefix format (rather than a JSON envelope) is deliberate:
+ *   - One scan to detect "is this encrypted?" — `value.startsWith('enc:1:')`
+ *   - Survives JSON.stringify when records flow through the sync wire
+ *   - Compact: ~1.4× the original byte length, vs ~2× for a JSON envelope
+ *   - Trivial to bump VERSION for future format migrations
+ *
+ * Authenticated encryption: AES-GCM provides both confidentiality and
+ * tamper-detection. A modified ciphertext fails decryption with an
+ * OperationError instead of returning silent garbage — `unwrapValue`
+ * surfaces that as a thrown error so callers can react.
+ *
+ * Value types: anything JSON-serialisable. The plaintext is JSON.stringified
+ * before encryption, JSON.parsed after decryption. `null` and `undefined`
+ * pass through unchanged so callers can blindly wrap optional fields
+ * without checking each one first.
+ */
+
+/** Bumped if the wire format ever changes. Old blobs stay readable as long
+ * as `unwrapValue` knows how to handle their version prefix. */
+export const ENCRYPTION_VERSION = 1;
+
+/** All encrypted blobs start with this exact prefix — used by `isEncrypted`. */
+export const ENC_PREFIX = `enc:${ENCRYPTION_VERSION}:`;
+
+/** AES-GCM standard IV length is 96 bits (12 bytes). Larger IVs are not
+ * recommended by NIST and would only burn entropy. */
+const IV_LENGTH = 12;
+
+// ─── Base64 helpers ───────────────────────────────────────────
+//
+// We avoid `btoa(String.fromCharCode(...bytes))` because the spread operator
+// hits the JS argument limit (~65k) for large records. The manual loop is
+// O(n) and works for any size.
+
+function bytesToBase64(bytes: Uint8Array): string {
+	let bin = '';
+	for (let i = 0; i < bytes.length; i++) bin += String.fromCharCode(bytes[i]);
+	return btoa(bin);
+}
+
+function base64ToBytes(b64: string): Uint8Array {
+	const bin = atob(b64);
+	const out = new Uint8Array(bin.length);
+	for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
+	return out;
+}
+
+/**
+ * TypeScript 5.7+ parameterised Uint8Array with the underlying buffer
+ * type, which now includes SharedArrayBuffer. Web Crypto's `BufferSource`
+ * type still expects a plain ArrayBuffer-backed view, so we need to copy
+ * the bytes through a fresh ArrayBuffer to satisfy the strict type check.
+ *
+ * This is a TypeScript-only annoyance — at runtime the call would have
+ * worked fine with the original Uint8Array. The copy is O(n) and
+ * negligible for the field sizes we encrypt (< 100 KB typical).
+ */
+function toBufferSource(bytes: Uint8Array): ArrayBuffer {
+	const buf = new ArrayBuffer(bytes.length);
+	new Uint8Array(buf).set(bytes);
+	return buf;
+}
+
+// ─── Public API ───────────────────────────────────────────────
+
+/**
+ * Returns true iff `value` is a string carrying the encryption prefix.
+ *
+ * Cheap synchronous detection — no decryption attempted. Use this to
+ * decide whether a field needs to be unwrapped on read, or whether a
+ * value coming back from a backend pull is already encrypted.
+ */
+export function isEncrypted(value: unknown): boolean {
+	return typeof value === 'string' && value.startsWith(ENC_PREFIX);
+}
+
+/**
+ * Encrypts `value` with `key` and returns the wire-format string. Pass-
+ * through for `null` / `undefined` so optional-field call sites stay
+ * concise:
+ *
+ *   record.title = await wrapValue(record.title, key);
+ *   record.notes = await wrapValue(record.notes, key); // safe even if null
+ *
+ * Throws if `key` is unusable (wrong algorithm, wrong usages). Each call
+ * generates a fresh random IV — never reuse one for the same key.
+ */
+export async function wrapValue(value: unknown, key: CryptoKey): Promise<unknown> {
+	if (value === null || value === undefined) return value;
+
+	const json = JSON.stringify(value);
+	const plaintext = new TextEncoder().encode(json);
+	const iv = crypto.getRandomValues(new Uint8Array(IV_LENGTH));
+
+	const ct = await crypto.subtle.encrypt(
+		{ name: 'AES-GCM', iv: toBufferSource(iv) },
+		key,
+		toBufferSource(plaintext)
+	);
+
+	return ENC_PREFIX + bytesToBase64(iv) + '.' + bytesToBase64(new Uint8Array(ct));
+}
+
+/**
+ * Decrypts a wire-format string back to its original JS value. Pass-
+ * through for non-strings, `null`/`undefined`, and any string that
+ * doesn't carry the encryption prefix — that way `unwrapValue` is safe
+ * to apply unconditionally to mixed records.
+ *
+ * Throws on tampered ciphertext (AES-GCM auth tag mismatch), malformed
+ * blobs, or wrong key. Callers should treat the throw as data corruption
+ * — there's no soft-recovery path.
+ */
+export async function unwrapValue(blob: unknown, key: CryptoKey): Promise<unknown> {
+	if (!isEncrypted(blob)) return blob;
+
+	const body = (blob as string).slice(ENC_PREFIX.length);
+	const dotIndex = body.indexOf('.');
+	if (dotIndex === -1) {
+		throw new Error('mana-crypto: malformed encrypted blob (missing iv/ct separator)');
+	}
+
+	const iv = base64ToBytes(body.slice(0, dotIndex));
+	const ct = base64ToBytes(body.slice(dotIndex + 1));
+
+	const plaintext = await crypto.subtle.decrypt(
+		{ name: 'AES-GCM', iv: toBufferSource(iv) },
+		key,
+		toBufferSource(ct)
+	);
+
+	const json = new TextDecoder().decode(plaintext);
+	return JSON.parse(json);
+}
+
+/**
+ * Generates a fresh AES-GCM-256 key. Used at vault initialisation time
+ * (Phase 2: server-side; tests: in-memory) to mint the per-user master
+ * key. The key is `extractable: true` so the server can wrap it with
+ * the KEK before storing — set to `false` for client-side derived keys
+ * that should never leave the browser.
+ */
+export async function generateMasterKey(extractable = true): Promise<CryptoKey> {
+	return crypto.subtle.generateKey({ name: 'AES-GCM', length: 256 }, extractable, [
+		'encrypt',
+		'decrypt',
+	]);
+}
+
+/**
+ * Imports a raw 32-byte buffer as an AES-GCM-256 key. Used by the
+ * Phase 3 client to take the bytes the vault endpoint returns and turn
+ * them into a non-extractable CryptoKey instance for runtime use.
+ */
+export async function importMasterKey(rawBytes: Uint8Array): Promise<CryptoKey> {
+	if (rawBytes.length !== 32) {
+		throw new Error(`mana-crypto: expected 32-byte master key, got ${rawBytes.length}`);
+	}
+	return crypto.subtle.importKey(
+		'raw',
+		toBufferSource(rawBytes),
+		{ name: 'AES-GCM', length: 256 },
+		false, // non-extractable: once it's in the browser, it stays there
+		['encrypt', 'decrypt']
+	);
+}
+
+/**
+ * Exports a key back to its raw 32 bytes. Only works on extractable
+ * keys; non-extractable keys throw. Used by tests and the Phase 2
+ * server-side wrap path.
+ */
+export async function exportMasterKey(key: CryptoKey): Promise<Uint8Array> {
+	const raw = await crypto.subtle.exportKey('raw', key);
+	return new Uint8Array(raw);
+}
diff --git a/apps/mana/apps/web/src/lib/data/crypto/index.ts b/apps/mana/apps/web/src/lib/data/crypto/index.ts
new file mode 100644
index 000000000..1c6e9ace4
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/data/crypto/index.ts
@@ -0,0 +1,45 @@
+/**
+ * Public surface of the data-layer encryption module.
+ *
+ * Phase 1 (this commit) ships the foundation only:
+ *   - AES-GCM-256 wrap/unwrap primitives
+ *   - KeyProvider interface with NullKeyProvider as the default
+ *   - Strict allowlist registry of fields-to-encrypt (all `enabled: false`)
+ *
+ * No table is actually encrypted yet. Phase 2 wires up the mana-auth
+ * server vault that mints + serves the per-user master key. Phase 3
+ * flips the registry entries to `enabled: true` table by table and
+ * teaches the Dexie hooks to call wrapValue/unwrapValue on the right
+ * fields. Phase 4 polishes the UX (settings page, lock state UI).
+ *
+ * Importers should pull from this barrel rather than reaching into the
+ * sub-files directly, so future internal refactors stay invisible.
+ */
+
+export {
+	ENCRYPTION_VERSION,
+	ENC_PREFIX,
+	isEncrypted,
+	wrapValue,
+	unwrapValue,
+	generateMasterKey,
+	importMasterKey,
+	exportMasterKey,
+} from './aes';
+
+export {
+	type KeyProvider,
+	MemoryKeyProvider,
+	setKeyProvider,
+	getKeyProvider,
+	getActiveKey,
+	isVaultUnlocked,
+} from './key-provider';
+
+export {
+	type EncryptionConfig,
+	ENCRYPTION_REGISTRY,
+	getEncryptedFields,
+	hasAnyEncryption,
+	getRegisteredTables,
+} from './registry';
diff --git a/apps/mana/apps/web/src/lib/data/crypto/key-provider.ts b/apps/mana/apps/web/src/lib/data/crypto/key-provider.ts
new file mode 100644
index 000000000..00cc2d4c4
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/data/crypto/key-provider.ts
@@ -0,0 +1,134 @@
+/**
+ * Pluggable master-key provider.
+ *
+ * The encryption pipeline (Dexie hooks, liveQuery wrapper) reads the active
+ * master key through `getActiveKey()` rather than holding a reference itself.
+ * That indirection lets us swap implementations without touching call sites:
+ *
+ *   - NullKeyProvider     — default. No key available → encryption is a
+ *                           no-op. Used during the gradual rollout while
+ *                           individual tables are still `enabled: false`,
+ *                           and in tests that don't care about crypto.
+ *   - MemoryKeyProvider   — holds an unwrapped CryptoKey in memory only.
+ *                           Wired up in Phase 3 with the bytes returned by
+ *                           the mana-auth `/me/encryption-key` endpoint.
+ *
+ * Why an interface and not a global variable?
+ *   - Tests can swap in fixed keys without monkey-patching imports
+ *   - Future PasskeyKeyProvider can replace the in-memory one without
+ *     touching the rest of the data layer
+ *   - Lock/unlock state changes are observable via `onChange`, so the
+ *     UI can react (show "vault locked" overlay, refetch encrypted lists)
+ */
+
+export interface KeyProvider {
+	/** Returns the active master key, or `null` if the vault is locked
+	 *  or no key has been provided yet. Synchronous on purpose so the
+	 *  Dexie hooks can call it inline without async overhead. */
+	getKey(): CryptoKey | null;
+
+	/** True iff a key is currently available. Cheaper to check than
+	 *  `getKey() !== null` if the caller doesn't need the key itself. */
+	isUnlocked(): boolean;
+
+	/** Subscribe to lock/unlock transitions. Returns a dispose function.
+	 *  Listeners fire only on STATE CHANGES, not on every getKey call. */
+	onChange(listener: (unlocked: boolean) => void): () => void;
+}
+
+// ─── NullKeyProvider — default ─────────────────────────────────
+
+/**
+ * Always-locked provider. Encryption call sites silently skip when this
+ * is active, so the app keeps running with plaintext data even though
+ * the encryption code paths are technically wired up. This is the safe
+ * default during Phase 1 (no tables flipped to `enabled: true` yet).
+ */
+class NullKeyProvider implements KeyProvider {
+	getKey(): null {
+		return null;
+	}
+	isUnlocked(): boolean {
+		return false;
+	}
+	onChange(): () => void {
+		return () => {};
+	}
+}
+
+// ─── MemoryKeyProvider — Phase 3 production path ───────────────
+
+/**
+ * Holds a CryptoKey in process memory. The key never touches localStorage,
+ * IndexedDB, or any other persistent surface — only sessionStorage gets a
+ * one-bit "is unlocked" sentinel for the UI to read on hard reload (so it
+ * knows whether to immediately show the locked overlay or wait for the
+ * vault fetch).
+ */
+export class MemoryKeyProvider implements KeyProvider {
+	private key: CryptoKey | null = null;
+	private listeners = new Set<(unlocked: boolean) => void>();
+
+	/** Set or clear the active key. `null` locks the vault. */
+	setKey(key: CryptoKey | null): void {
+		const wasUnlocked = this.key !== null;
+		this.key = key;
+		const nowUnlocked = key !== null;
+
+		if (typeof window !== 'undefined') {
+			if (nowUnlocked) sessionStorage.setItem('mana-vault-unlocked', '1');
+			else sessionStorage.removeItem('mana-vault-unlocked');
+		}
+
+		if (wasUnlocked !== nowUnlocked) {
+			for (const fn of this.listeners) {
+				try {
+					fn(nowUnlocked);
+				} catch (err) {
+					// Listeners are UI subscribers — never let one bad listener
+					// break the lock/unlock cycle.
+					console.error('[mana-crypto] vault listener threw:', err);
+				}
+			}
+		}
+	}
+
+	getKey(): CryptoKey | null {
+		return this.key;
+	}
+
+	isUnlocked(): boolean {
+		return this.key !== null;
+	}
+
+	onChange(listener: (unlocked: boolean) => void): () => void {
+		this.listeners.add(listener);
+		return () => {
+			this.listeners.delete(listener);
+		};
+	}
+}
+
+// ─── Module-level active provider ──────────────────────────────
+
+let _activeProvider: KeyProvider = new NullKeyProvider();
+
+/** Replace the active provider. Called once at app boot in Phase 3. */
+export function setKeyProvider(provider: KeyProvider): void {
+	_activeProvider = provider;
+}
+
+/** Returns the currently-installed provider. */
+export function getKeyProvider(): KeyProvider {
+	return _activeProvider;
+}
+
+/** Convenience: returns the active key or `null` if locked. */
+export function getActiveKey(): CryptoKey | null {
+	return _activeProvider.getKey();
+}
+
+/** Convenience: synchronous lock check. */
+export function isVaultUnlocked(): boolean {
+	return _activeProvider.isUnlocked();
+}
diff --git a/apps/mana/apps/web/src/lib/data/crypto/registry.ts b/apps/mana/apps/web/src/lib/data/crypto/registry.ts
new file mode 100644
index 000000000..1309fae2b
--- /dev/null
+++ b/apps/mana/apps/web/src/lib/data/crypto/registry.ts
@@ -0,0 +1,166 @@
+/**
+ * Encryption registry — single source of truth for which fields on which
+ * tables get encrypted.
+ *
+ * Strict allowlist semantics: anything not listed here stays plaintext.
+ * Adding a new module = adding an entry here. Forgetting to add a field
+ * means it ships in plaintext, which is the safer failure mode than the
+ * inverse (a typo'd field name silently failing to decrypt).
+ *
+ * Why a central registry instead of per-module config?
+ *   - One pull request to audit ahead of a release: "what is encrypted?"
+ *   - The Dexie hook in database.ts iterates this map once at startup
+ *     instead of looking up per-module config files at write time
+ *   - Keeps the encryption surface visible to security review without
+ *     hunting through 27 module directories
+ *
+ * Phasing:
+ *   `enabled: false` is the safe default for Phase 1. The actual flip
+ *   to `true` happens in Phase 3, table by table, after the server-side
+ *   vault is wired up and the key provider is no longer NullKeyProvider.
+ *   This means Phase 1 can land on main without changing app behaviour.
+ *
+ * Field selection rules:
+ *   - Encrypt: user-typed text, transcripts, PII, free-form notes,
+ *     anything that would embarrass or harm the user if it leaked
+ *   - Plaintext: IDs, foreign keys, timestamps, status flags, sort keys,
+ *     enum discriminators, anything indexed for queries
+ *   - When in doubt about a free-form field, encrypt it
+ *   - When in doubt about a structural field, leave it plaintext (the
+ *     query layer needs it)
+ */
+
+export interface EncryptionConfig {
+	/** Field names that get encrypted on write, decrypted on read. */
+	readonly fields: readonly string[];
+	/** Phase 1 hard-default: false. Flipped table by table in Phase 3. */
+	readonly enabled: boolean;
+}
+
+export const ENCRYPTION_REGISTRY: Record<string, EncryptionConfig> = {
+	// ─── Chat ────────────────────────────────────────────────
+	messages: { enabled: false, fields: ['messageText'] },
+	conversations: { enabled: false, fields: ['title'] },
+	chatTemplates: {
+		enabled: false,
+		fields: ['name', 'description', 'systemPrompt', 'initialQuestion'],
+	},
+
+	// ─── Notes ───────────────────────────────────────────────
+	notes: { enabled: false, fields: ['title', 'body', 'content'] },
+
+	// ─── Dreams ──────────────────────────────────────────────
+	dreams: { enabled: false, fields: ['title', 'content', 'notes'] },
+	dreamSymbols: { enabled: false, fields: ['name', 'meaning'] },
+
+	// ─── Memoro ──────────────────────────────────────────────
+	memos: { enabled: false, fields: ['title', 'intro', 'transcript'] },
+	memories: { enabled: false, fields: ['title', 'content'] },
+
+	// ─── Contacts ────────────────────────────────────────────
+	contacts: {
+		enabled: false,
+		fields: [
+			'firstName',
+			'lastName',
+			'email',
+			'phone',
+			'mobile',
+			'birthday',
+			'street',
+			'city',
+			'postalCode',
+			'country',
+			'notes',
+			'website',
+			'linkedin',
+			'twitter',
+			'instagram',
+			'github',
+		],
+	},
+
+	// ─── Tasks ───────────────────────────────────────────────
+	tasks: { enabled: false, fields: ['title', 'description', 'subtasks', 'metadata'] },
+
+	// ─── Calendar ────────────────────────────────────────────
+	events: { enabled: false, fields: ['title', 'description', 'location'] },
+
+	// ─── Cycles ──────────────────────────────────────────────
+	cycles: { enabled: false, fields: ['notes'] },
+	cycleDayLogs: { enabled: false, fields: ['notes', 'symptoms', 'mood'] },
+
+	// ─── NutriPhi ────────────────────────────────────────────
+	meals: { enabled: false, fields: ['description', 'notes', 'aiAnalysis'] },
+
+	// ─── Planta ──────────────────────────────────────────────
+	plants: { enabled: false, fields: ['name', 'notes', 'careNotes'] },
+
+	// ─── Cards ───────────────────────────────────────────────
+	cards: { enabled: false, fields: ['front', 'back', 'notes'] },
+	cardDecks: { enabled: false, fields: ['title', 'description'] },
+
+	// ─── Presi ───────────────────────────────────────────────
+	presiDecks: { enabled: false, fields: ['title', 'description'] },
+	slides: { enabled: false, fields: ['content', 'notes'] },
+
+	// ─── Context ─────────────────────────────────────────────
+	documents: { enabled: false, fields: ['title', 'content', 'body'] },
+
+	// ─── Storage ─────────────────────────────────────────────
+	files: { enabled: false, fields: ['name', 'originalName', 'notes'] },
+
+	// ─── Picture ─────────────────────────────────────────────
+	images: { enabled: false, fields: ['prompt', 'negativePrompt', 'revisedPrompt', 'notes'] },
+
+	// ─── Music ───────────────────────────────────────────────
+	songs: { enabled: false, fields: ['title', 'artist', 'album', 'lyrics', 'notes'] },
+	mukkePlaylists: { enabled: false, fields: ['name', 'description'] },
+
+	// ─── Questions ───────────────────────────────────────────
+	questions: { enabled: false, fields: ['title', 'body', 'notes'] },
+	answers: { enabled: false, fields: ['body'] },
+
+	// ─── Events (social gatherings) ──────────────────────────
+	socialEvents: { enabled: false, fields: ['title', 'description', 'notes'] },
+	eventGuests: { enabled: false, fields: ['name', 'email', 'phone', 'notes'] },
+
+	// ─── Finance ─────────────────────────────────────────────
+	transactions: { enabled: false, fields: ['description', 'notes', 'merchant'] },
+
+	// ─── uLoad ───────────────────────────────────────────────
+	links: { enabled: false, fields: ['title', 'description', 'targetUrl'] },
+	manaLinks: { enabled: false, fields: ['label', 'url', 'notes'] },
+
+	// ─── Inventar ────────────────────────────────────────────
+	invItems: { enabled: false, fields: ['name', 'description', 'notes'] },
+};
+
+/**
+ * Returns the field allowlist for `tableName`, or `null` if the table is
+ * either not registered, currently disabled, or has an empty field list.
+ * Hot-path helper used by the Dexie hooks — must stay synchronous and
+ * allocation-free for the common (non-encrypted) case.
+ */
+export function getEncryptedFields(tableName: string): readonly string[] | null {
+	const config = ENCRYPTION_REGISTRY[tableName];
+	if (!config || !config.enabled || config.fields.length === 0) return null;
+	return config.fields;
+}
+
+/** True if at least one table is currently flipped to encrypted. Used by
+ *  the Phase 3 boot path to decide whether to fetch the master key at
+ *  all — no point asking the server for a key when nothing uses it. */
+export function hasAnyEncryption(): boolean {
+	for (const config of Object.values(ENCRYPTION_REGISTRY)) {
+		if (config.enabled) return true;
+	}
+	return false;
+}
+
+/** All table names that have an encryption entry, regardless of whether
+ *  they're currently enabled. Used by the rollout audit and the
+ *  DATA_LAYER_AUDIT.md doc to confirm coverage. */
+export function getRegisteredTables(): string[] {
+	return Object.keys(ENCRYPTION_REGISTRY);
+}