diff --git a/CHANGELOG.md b/CHANGELOG.md
index 129033b..13a2149 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## CHANGE LOG
 
+### v6.5.0
+
+- 为 Qiniu::Auth 添加一个异常处理逻辑，在 Access Key 和 Secret Key 未正常设置（nil 值）的情况下给出正确提示。[https://github.com/qiniu/ruby-sdk/pull/124](https://github.com/qiniu/ruby-sdk/pull/124)
+
 ### v6.4.2
 
 - gem 兼容性调整 。 [https://github.com/qiniu/ruby-sdk/pull/122](https://github.com/qiniu/ruby-sdk/pull/122)
diff --git a/Gemfile.lock b/Gemfile.lock
index 1397204..fba0c60 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    qiniu (6.4.1)
+    qiniu (6.5.0)
       json (~> 1.8)
       mime-types (~> 1.19)
       rest-client (~> 1.7.3)
diff --git a/lib/qiniu/auth.rb b/lib/qiniu/auth.rb
index 210c6fa..f261701 100755
--- a/lib/qiniu/auth.rb
+++ b/lib/qiniu/auth.rb
@@ -25,6 +25,18 @@ module Qiniu
           # 默认授权期1小时
           return Time.now.to_i + DEFAULT_AUTH_SECONDS
         end # calculate_deadline
+
+        def calculate_hmac_sha1_digest(sk, str)
+          begin
+            sign = HMAC::SHA1.new(sk).update(str).digest
+          rescue RuntimeError => e
+            raise RuntimeError, "Please set Qiniu's access_key and secret_key before authorize any tokens."
+          rescue
+            raise
+          else
+            return sign
+          end
+        end
       end # class << self
 
       class PutPolicy
@@ -169,7 +181,7 @@ module Qiniu
           end
 
           ### 生成数字签名
-          sign = HMAC::SHA1.new(secret_key).update(download_url).digest
+          sign = calculate_hmac_sha1_digest(secret_key, download_url)
           encoded_sign = Utils.urlsafe_base64_encode(sign)
 
           ### 生成下载授权凭证
@@ -219,7 +231,7 @@ module Qiniu
           end
 
           ### 生成数字签名
-          sign = HMAC::SHA1.new(secret_key).update(signing_str).digest
+          sign = calculate_hmac_sha1_digest(secret_key, signing_str)
           encoded_sign = Utils.urlsafe_base64_encode(sign)
 
           ### 生成管理授权凭证
@@ -238,7 +250,7 @@ module Qiniu
           encoded_put_policy = Utils.urlsafe_base64_encode(put_policy.to_json)
 
           ### 生成数字签名
-          sign = HMAC::SHA1.new(secret_key).update(encoded_put_policy).digest
+          sign = calculate_hmac_sha1_digest(secret_key, encoded_put_policy)
           encoded_sign = Utils.urlsafe_base64_encode(sign)
 
           ### 生成上传授权凭证
diff --git a/lib/qiniu/version.rb b/lib/qiniu/version.rb
index 3a5f348..58d7d89 100755
--- a/lib/qiniu/version.rb
+++ b/lib/qiniu/version.rb
@@ -3,8 +3,8 @@
 module Qiniu
     module Version
       MAJOR = 6
-      MINOR = 4
-      PATCH = 2
+      MINOR = 5
+      PATCH = 0
       # Returns a version string by joining <tt>MAJOR</tt>, <tt>MINOR</tt>, and <tt>PATCH</tt> with <tt>'.'</tt>
       #
       # Example
diff --git a/spec/qiniu/auth_spec.rb b/spec/qiniu/auth_spec.rb
index 5648846..cf4fa88 100755
--- a/spec/qiniu/auth_spec.rb
+++ b/spec/qiniu/auth_spec.rb
@@ -68,7 +68,41 @@ module Qiniu
           puts data.inspect
         end
       end
-
     end
-  end # module Storage
+  end # module Auth
+
+  module Exception_Auth
+    describe Exception_Auth, :not_set_ak_sk => true do
+      ### 测试未设置 ak/sk 的异常抛出情况
+      context ".not_set_ak_sk" do
+        it "should works" do
+          puts Qiniu::Config.instance_variable_get("@settings").inspect
+
+          begin
+            uptoken = Qiniu::Auth.generate_uptoken({})
+          rescue => e
+            e.message.should == "Please set Qiniu's access_key and secret_key before authorize any tokens."
+          else
+            fail "Not raise any exception."
+          end
+
+          begin
+            download_url = Qiniu::Auth.authorize_download_url("http://test.qiniudn.com/a_private_file")
+          rescue => e
+            e.message.should == "Please set Qiniu's access_key and secret_key before authorize any tokens."
+          else
+            fail "Not raise any exception."
+          end
+
+          begin
+            acctoken = Qiniu::Auth.generate_acctoken("http://rsf.qbox.me/list")
+          rescue => e
+            e.message.should == "Please set Qiniu's access_key and secret_key before authorize any tokens."
+          else
+            fail "Not raise any exception."
+          end
+        end
+      end
+    end
+  end # module Exception_Auth
 end # module Qiniu
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index b5ec3ee..54eefd7 100755
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,6 +8,9 @@ RSpec.configure do |config|
   config.before :all do
     Qiniu.establish_connection! :access_key => ENV["QINIU_ACCESS_KEY"], :secret_key => ENV["QINIU_SECRET_KEY"]
   end
+  config.before :each, :not_set_ak_sk => true do
+    Qiniu.establish_connection! :access_key => nil, :secret_key => nil
+  end
 end
 
 def make_unique_bucket (bucket)