diff --git a/index.js b/index.js
index c38b444..5bfe865 100644
--- a/index.js
+++ b/index.js
@@ -21,5 +21,3 @@ export {
   getPublicKey,
   getBlankEvent
 }
-export * from './nip04'
-export * from './nip05'
diff --git a/nip04.js b/nip04.js
index 1485ed8..cd3c4cb 100644
--- a/nip04.js
+++ b/nip04.js
@@ -1,11 +1,12 @@
 import {Buffer} from 'buffer'
+import randomBytes from 'randombytes'
 import * as secp256k1 from '@noble/secp256k1'
 
 export function encrypt(privkey, pubkey, text) {
   const key = secp256k1.getSharedSecret(privkey, '02' + pubkey)
   const normalizedKey = getOnlyXFromFullSharedSecret(key)
 
-  let iv = crypto.randomFillSync(new Uint8Array(16))
+  let iv = Uint8Array.from(randomBytes(16))
   var cipher = crypto.createCipheriv(
     'aes-256-cbc',
     Buffer.from(normalizedKey, 'hex'),
diff --git a/nip06.js b/nip06.js
new file mode 100644
index 0000000..93f788f
--- /dev/null
+++ b/nip06.js
@@ -0,0 +1,16 @@
+import createHmac from 'create-hmac'
+import * as bip39 from 'bip39'
+
+export function privateKeyFromSeed(seed) {
+  let hmac = createHmac('sha512', Buffer.from('Nostr seed', 'utf8'))
+  hmac.update(seed)
+  return hmac.digest().slice(0, 32).toString('hex')
+}
+
+export function seedFromWords(mnemonic) {
+  return bip39.mnemonicToSeedSync(mnemonic)
+}
+
+export function generateSeedWords() {
+  return bip39.entropyToMnemonic(randomBytes(16).toString('hex'))
+}
diff --git a/package.json b/package.json
index ed31294..0b1b025 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.6.5",
+  "version": "0.7.0",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",
@@ -8,8 +8,11 @@
   },
   "dependencies": {
     "@noble/secp256k1": "^1.3.0",
+    "bip39": "^3.0.4",
     "buffer": "^6.0.3",
+    "create-hmac": "^1.1.7",
     "dns-packet": "^5.2.4",
+    "randombytes": "^2.1.0",
     "websocket-polyfill": "^0.0.3"
   },
   "keywords": [