diff --git a/CHANGELOG.md b/CHANGELOG.md
index d277998..280cb98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## CHANGE LOG
 
+### V6.5.1
+
+- 为 Qiniu::Auth 添加验证七牛回调请求签名合法性的函数。[https://github.com/qiniu/ruby-sdk/pull/133](https://github.com/qiniu/ruby-sdk/pull/133)
+
 ### 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/126](https://github.com/qiniu/ruby-sdk/pull/126)
diff --git a/Gemfile.lock b/Gemfile.lock
index fba0c60..2abe055 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    qiniu (6.5.0)
+    qiniu (6.5.1)
       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 f261701..9e3213f 100755
--- a/lib/qiniu/auth.rb
+++ b/lib/qiniu/auth.rb
@@ -206,11 +206,7 @@ module Qiniu
           return authorize_download_url(download_url, args)
         end # authorize_download_url_2
 
-        def generate_acctoken(url, body = '')
-          ### 提取AK/SK信息
-          access_key = Config.settings[:access_key]
-          secret_key = Config.settings[:secret_key]
-
+        def generate_acctoken_sign_with_mac(access_key, secret_key, url, body)
           ### 解析URL，生成待签名字符串
           uri = URI.parse(url)
           signing_str = uri.path
@@ -232,13 +228,12 @@ module Qiniu
 
           ### 生成数字签名
           sign = calculate_hmac_sha1_digest(secret_key, signing_str)
-          encoded_sign = Utils.urlsafe_base64_encode(sign)
+          return Utils.urlsafe_base64_encode(sign)
+        end # generate_acctoken_sign_with_mac
 
-          ### 生成管理授权凭证
-          acctoken = "#{access_key}:#{encoded_sign}"
-
-          ### 返回管理授权凭证
-          return acctoken
+        def generate_acctoken(url, body = '')
+          encoded_sign = generate_acctoken_sign_with_mac(Config.settings[:access_key], Config.settings[:secret_key], url, body)
+          return "#{Config.settings[:access_key]}:#{encoded_sign}"
         end # generate_acctoken
 
         def generate_uptoken(put_policy)
@@ -259,6 +254,31 @@ module Qiniu
           ### 返回上传授权凭证
           return uptoken
         end # generate_uptoken
+
+        def authenticate_callback_request(auth_str, url, body = '')
+          ### 提取AK/SK信息
+          access_key = Config.settings[:access_key]
+          secret_key = Config.settings[:secret_key]
+
+          ### 检查签名格式
+          ak_pos = auth_str.index(access_key)
+          if ak_pos.nil? then
+            return false
+          end
+
+          colon_pos = auth_str.index(':', ak_pos + 1)
+          if colon_pos.nil? || ((ak_pos + access_key.length) != colon_pos) then
+            return false
+          end
+
+          encoded_sign = generate_acctoken_sign_with_mac(access_key, secret_key, url, body)
+          sign_pos = auth_str.index(encoded_sign, colon_pos + 1)
+          if sign_pos.nil? || ((sign_pos + encoded_sign.length) != auth_str.length) then
+            return false
+          end
+
+          return true
+        end # authenticate_callback_request
       end # class << self
 
     end # module Auth
diff --git a/lib/qiniu/version.rb b/lib/qiniu/version.rb
index 58d7d89..8393b82 100755
--- a/lib/qiniu/version.rb
+++ b/lib/qiniu/version.rb
@@ -4,7 +4,7 @@ module Qiniu
     module Version
       MAJOR = 6
       MINOR = 5
-      PATCH = 0
+      PATCH = 1
       # 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 cf4fa88..62cb503 100755
--- a/spec/qiniu/auth_spec.rb
+++ b/spec/qiniu/auth_spec.rb
@@ -3,6 +3,7 @@
 
 require 'spec_helper'
 require 'qiniu/auth'
+require 'qiniu/config'
 require 'qiniu/storage'
 require 'digest/sha1'
 
@@ -69,6 +70,25 @@ module Qiniu
         end
       end
     end
+
+    ### 测试回调签名
+    context ".authenticate_callback_request" do
+      it "should works" do
+        url = '/test.php'
+        body = 'name=xxx&size=1234'
+        false.should == Qiniu::Auth.authenticate_callback_request('ABCD', url, body)
+        false.should == Qiniu::Auth.authenticate_callback_request(Config.settings[:access_key], url, body)
+        false.should == Qiniu::Auth.authenticate_callback_request('QBox ' + Config.settings[:access_key] + ':', url, body)
+        false.should == Qiniu::Auth.authenticate_callback_request('QBox ' + Config.settings[:access_key] + ':????', url, body)
+
+        acctoken = Qiniu::Auth.generate_acctoken(url, body)
+        auth_str = 'QBox ' + acctoken
+
+        false.should == Qiniu::Auth.authenticate_callback_request(auth_str + '  ', url, body)
+        true.should == Qiniu::Auth.authenticate_callback_request(auth_str, url, body)
+        true.should == Qiniu::Auth.authenticate_callback_request(acctoken, url, body)
+      end
+    end
   end # module Auth
 
   module Exception_Auth