diff --git a/CHANGELOG.md b/CHANGELOG.md
index cadca14..6bfc9f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,3 @@
-1.0.1
------
-
-## Security Notes
-
-- Fix Session replay secure issue that when Rails application use CookieStore.
-
 1.0.0
 -----
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 93492ae..ec66969 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rucaptcha (1.0.1)
+    rucaptcha (1.0.0)
       railties (>= 3.2)
 
 GEM
diff --git a/lib/rucaptcha/configuration.rb b/lib/rucaptcha/configuration.rb
index d4d31c4..7a87cf7 100644
--- a/lib/rucaptcha/configuration.rb
+++ b/lib/rucaptcha/configuration.rb
@@ -11,7 +11,7 @@ module RuCaptcha
     attr_accessor :cache_limit
     # Color style, default: :colorful, allows: [:colorful, :black_white]
     attr_accessor :style
-    # rucaptcha expire time, default 2 minutes
+    # session[:_rucaptcha] expire time, default 2 minutes
     attr_accessor :expires_in
   end
 end
diff --git a/lib/rucaptcha/controller_helpers.rb b/lib/rucaptcha/controller_helpers.rb
index 1f67a7c..ceb9c76 100644
--- a/lib/rucaptcha/controller_helpers.rb
+++ b/lib/rucaptcha/controller_helpers.rb
@@ -6,55 +6,28 @@ module RuCaptcha
       helper_method :verify_rucaptcha?
     end
 
-    def rucaptcha_sesion_key_key
-      ['rucaptcha-session', session.id].join(':')
-    end
-
     def generate_rucaptcha
-      code = RuCaptcha::Captcha.random_chars
-      Rails.cache.write(rucaptcha_sesion_key_key, {
-        code: code,
-        time: Time.now.to_i
-      })
+      session[:_rucaptcha]    = RuCaptcha::Captcha.random_chars
+      session[:_rucaptcha_at] = Time.now.to_i
 
-      RuCaptcha::Captcha.create(code)
+      RuCaptcha::Captcha.create(session[:_rucaptcha])
     end
 
     def verify_rucaptcha?(resource = nil)
-      store_info = Rails.cache.read(rucaptcha_sesion_key_key)
-      # make sure move used key
-      Rails.cache.delete(rucaptcha_sesion_key_key)
-
-      # Make sure session exist
-      if store_info.blank?
-        return add_rucaptcha_validation_error
-      end
-
-      # Make sure not expire
-      if (Time.now.to_i - store_info[:time]) > RuCaptcha.config.expires_in
-        return add_rucaptcha_validation_error
-      end
-
-      # Make sure parama have captcha
+      rucaptcha_at = session[:_rucaptcha_at].to_i
       captcha = (params[:_rucaptcha] || '').downcase.strip
-      if captcha.blank?
-        return add_rucaptcha_validation_error
+
+      # Captcha chars in Session expire in 2 minutes
+      valid = false
+      if (Time.now.to_i - rucaptcha_at) <= RuCaptcha.config.expires_in
+        valid = captcha.present? && captcha == session.delete(:_rucaptcha)
       end
 
-      if captcha != store_info[:code]
-        return add_rucaptcha_validation_error
+      if resource && resource.respond_to?(:errors)
+        resource.errors.add(:base, t('rucaptcha.invalid')) unless valid
       end
 
-      true
-    end
-
-    private
-
-    def add_rucaptcha_validation_error
-      if defined?(resource) && resource && resource.respond_to?(:errors)
-        resource.errors.add(:base, t('rucaptcha.invalid'))
-      end
-      false
+      valid
     end
   end
 end
diff --git a/lib/rucaptcha/version.rb b/lib/rucaptcha/version.rb
index 96b3a67..12a51a3 100644
--- a/lib/rucaptcha/version.rb
+++ b/lib/rucaptcha/version.rb
@@ -1,3 +1,3 @@
 module RuCaptcha
-  VERSION = '1.0.1'
+  VERSION = '1.0.0'
 end
diff --git a/spec/controller_helpers_spec.rb b/spec/controller_helpers_spec.rb
index bddf38c..f1db008 100644
--- a/spec/controller_helpers_spec.rb
+++ b/spec/controller_helpers_spec.rb
@@ -1,45 +1,23 @@
 require 'spec_helper'
-require 'securerandom'
 
 describe RuCaptcha do
-  class CustomSession
-    attr_accessor :id
-
-    def initialize
-      self.id = SecureRandom.hex
-    end
-  end
   class Simple < ActionController::Base
     def session
-      @session ||= CustomSession.new
+      @session ||= {}
     end
 
     def params
       @params ||= {}
     end
-
-    def custom_session
-      Rails.cache.read(self.rucaptcha_sesion_key_key)
-    end
-
-    def clean_custom_session
-      Rails.cache.delete(self.rucaptcha_sesion_key_key)
-    end
   end
 
   let(:simple) { Simple.new }
 
-  describe '.rucaptcha_sesion_key_key' do
-    it 'should work' do
-      expect(simple.rucaptcha_sesion_key_key).to eq ['rucaptcha-session', simple.session.id].join(':')
-    end
-  end
-
   describe '.generate_rucaptcha' do
     it 'should work' do
       expect(RuCaptcha::Captcha).to receive(:random_chars).and_return('abcd')
       expect(simple.generate_rucaptcha).not_to be_nil
-      expect(simple.custom_session[:code]).to eq('abcd')
+      expect(simple.session[:_rucaptcha]).to eq('abcd')
     end
   end
 
@@ -51,7 +29,7 @@ describe RuCaptcha do
       end
 
       it 'should work when session[:_rucaptcha] is nil' do
-        simple.clean_custom_session
+        simple.session[:_rucaptcha] = nil
         simple.params[:_rucaptcha] = 'Abcd'
         expect(simple.verify_rucaptcha?).to eq(false)
       end
@@ -59,18 +37,11 @@ describe RuCaptcha do
 
     context 'Correct chars in params' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
-          time: Time.now.to_i,
-          code: 'abcd'
-        })
+        simple.session[:_rucaptcha_at] = Time.now.to_i
+        simple.session[:_rucaptcha] = 'abcd'
         simple.params[:_rucaptcha] = 'Abcd'
         expect(simple.verify_rucaptcha?).to eq(true)
-        expect(simple.custom_session).to eq nil
-
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
-          time: Time.now.to_i,
-          code: 'abcd'
-        })
+        simple.session[:_rucaptcha] = 'abcd'
         simple.params[:_rucaptcha] = 'AbcD'
         expect(simple.verify_rucaptcha?).to eq(true)
       end
@@ -78,22 +49,17 @@ describe RuCaptcha do
 
     describe 'Incorrect chars' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
-          time: Time.now.to_i - 60,
-          code: 'abcd'
-        })
+        simple.session[:_rucaptcha_at] = Time.now.to_i - 60
+        simple.session[:_rucaptcha] = 'abcd'
         simple.params[:_rucaptcha] = 'd123'
         expect(simple.verify_rucaptcha?).to eq(false)
-        expect(simple.custom_session).to eq nil
       end
     end
 
     describe 'Expires Session key' do
       it 'should work' do
-        Rails.cache.write(simple.rucaptcha_sesion_key_key, {
-          time: Time.now.to_i - 121,
-          code: 'abcd'
-        })
+        simple.session[:_rucaptcha_at] = Time.now.to_i - 121
+        simple.session[:_rucaptcha] = 'abcd'
         simple.params[:_rucaptcha] = 'abcd'
         expect(simple.verify_rucaptcha?).to eq(false)
       end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7549506..75c1ef6 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -13,10 +13,6 @@ module Rails
     def root
       Pathname.new(File.join(File.dirname(__FILE__), '..'))
     end
-
-    def cache
-      @cache ||= ActiveSupport::Cache::MemoryStore.new
-    end
   end
 end