diff --git a/ticc.js b/ticc.js
index 41d796d..4318b0e 100644
--- a/ticc.js
+++ b/ticc.js
@@ -184,7 +184,7 @@ class TicCrypto {
    * @return {String}
    * @memberof TicCrypto
    */
-  static hash (data, { hasher = my.HASHER, salt, input = my.INPUT, output = my.OUTPUT } = {}) {
+  static hash_easy (data, { hasher = my.HASHER, salt, input = my.INPUT, output = my.OUTPUT } = {}) {
     // data can be anything, but converts to string or remains be Buffer/TypedArray/DataView
     if (this.is_hashable({ data })) {
       if (typeof data !== 'string' && !(data instanceof Buffer) && !(data instanceof DataView)) data = JSON.stringify(data)
@@ -208,7 +208,7 @@ class TicCrypto {
    * @return {String}
    * @memberof TicCrypto
    */
-  static async encrypt ({ data, tool = 'crypto', keytype = 'pwd', key, input, output, cipher } = {}) {
+  static async encrypt_easy ({ data, tool = 'crypto', keytype = 'pwd', key, input, output, cipher } = {}) {
     if (tool === 'eccrypto') {
       // data 应当是 utf8 的字符串。key 必须是 pubkey
       // eccrypto 能用 Uint8Array 和 Buffer
@@ -248,7 +248,7 @@ class TicCrypto {
    * @return {String}
    * @memberof TicCrypto
    */
-  static async decrypt ({ data = {}, tool = 'crypto', keytype = 'pwd', key, input, output, cipher } = {}) {
+  static async decrypt_easy ({ data = {}, tool = 'crypto', keytype = 'pwd', key, input, output, cipher } = {}) {
     // data 应当是 encrypt 输出的数据类型
     if (tool === 'eccrypto') {
       try {
@@ -297,7 +297,7 @@ class TicCrypto {
    * @return {String}
    * @memberof TicCrypto
    */
-  static async sign ({ data, seckey, tool = 'crypto', hasher }) {
+  static async sign_easy ({ data, seckey, tool = 'crypto', hasher }) {
     // data can be string or buffer or object, results are the same
     if (this.is_hashable({ data }) && this.is_seckey(seckey)) {
       if (tool === 'nacl' && seckey.length === 128) {
@@ -334,7 +334,7 @@ class TicCrypto {
    * @return {Boolean}
    * @memberof TicCrypto
    */
-  static async verify ({ data, signature, pubkey, tool = 'crypto', hasher }) {
+  static async verify_easy ({ data, signature, pubkey, tool = 'crypto', hasher }) {
     // data could be anything, but converts to string or remains be Buffer/TypedArray/DataView
     if (this.is_hashable({ data }) && this.is_signature(signature) && this.is_pubkey({ pubkey })) {
       if ('nacl' === tool && signature.length === 128) {
@@ -905,10 +905,10 @@ class TicCrypto {
    * @return {*}
    * @memberof TicCrypto
    */
-  static randomize_keypair ({ tool, purpose } = {}) {
+  static randomize_keypair ({ tool, purpose = 'sign' } = {}) {
     let kp
     if (tool === 'nacl') {
-      if (purpose === 'encrypt') {
+      if (purpose === 'secret') {
         kp = nacl.box.keyPair()
       } else {
         kp = nacl.sign.keyPair()