diff --git a/lib/utils/common.js b/lib/utils/common.js
index 17f9d42..408f154 100644
--- a/lib/utils/common.js
+++ b/lib/utils/common.js
@@ -28,6 +28,22 @@ utils.common = {
   quote: function (obj) {
     return JSON.stringify(obj)
   },
+  b64encode: function (str) {
+    // Unicode safe b64 encoding
+    // https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem
+    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
+      function toSolidBytes (match, p1) {
+        // noinspection JSCheckFunctionSignatures
+        return String.fromCharCode('0x' + p1)
+      }))
+  },
+  b64decode: function (str) {
+    // Unicode safe b64 decoding
+    // https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem
+    return decodeURIComponent(atob(str).split('').map(function (c) {
+      return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
+    }).join(''))
+  },
   uniqueList: function (list) {
     let tmp = {}
     let r = []
diff --git a/package.json b/package.json
index 2f8cc9f..608f610 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "test": "grunt test --verbose"
   },
   "standard": {
-    "globals": ["random", "make", "utils", "logger", "MersenneTwister", "o"],
+    "globals": ["random", "make", "utils", "logger", "MersenneTwister", "o", "btoa", "atob"],
     "envs": ["browser"]
   }
 }