diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index be56851..5dcaae1 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,7 +2,10 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="639ae4d9-f724-4d12-8643-1809dde72798" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/tpke.go" beforeDir="false" afterPath="$PROJECT_DIR$/tpke.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/public_key.go" beforeDir="false" afterPath="$PROJECT_DIR$/public_key.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/tpke_test.go" beforeDir="false" afterPath="$PROJECT_DIR$/tpke_test.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/utils.go" beforeDir="false" afterPath="$PROJECT_DIR$/utils.go" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -60,12 +63,12 @@
       </usages-collector>
       <usages-collector id="statistics.file.extensions.edit">
         <counts>
-          <entry key="go" value="8458" />
+          <entry key="go" value="8482" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.types.edit">
         <counts>
-          <entry key="Go" value="8458" />
+          <entry key="Go" value="8482" />
         </counts>
       </usages-collector>
       <usages-collector id="statistics.file.extensions.open">
@@ -82,11 +85,11 @@
   </component>
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file pinned="false" current-in-tab="false">
+      <file pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/utils.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="136">
-              <caret line="71" column="5" selection-start-line="71" selection-start-column="5" selection-end-line="71" selection-end-column="5" />
+            <state relative-caret-position="299">
+              <caret line="78" column="44" selection-start-line="78" selection-start-column="44" selection-end-line="78" selection-end-column="44" />
             </state>
           </provider>
         </entry>
@@ -100,11 +103,11 @@
           </provider>
         </entry>
       </file>
-      <file pinned="false" current-in-tab="true">
+      <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/tpke.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="489">
-              <caret line="146" column="50" selection-start-line="146" selection-start-column="50" selection-end-line="146" selection-end-column="50" />
+            <state relative-caret-position="236">
+              <caret line="59" column="21" lean-forward="true" selection-start-line="59" selection-start-column="21" selection-end-line="59" selection-end-column="21" />
             </state>
           </provider>
         </entry>
@@ -139,8 +142,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/tpke_test.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="1200">
-              <caret line="340" column="37" lean-forward="true" selection-start-line="340" selection-start-column="37" selection-end-line="340" selection-end-column="37" />
+            <state relative-caret-position="121">
+              <caret line="81" selection-start-line="81" selection-end-line="81" />
             </state>
           </provider>
         </entry>
@@ -148,8 +151,8 @@
       <file pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/public_key.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="361">
-              <caret line="39" column="13" selection-start-line="39" selection-start-column="13" selection-end-line="39" selection-end-column="13" />
+            <state relative-caret-position="184">
+              <caret line="39" selection-start-line="39" selection-end-line="39" />
             </state>
           </provider>
         </entry>
@@ -197,7 +200,6 @@
       <find>frOne</find>
       <find>G2Projective</find>
       <find>hashg2</find>
-      <find>Encrypt</find>
       <find>marshal</find>
       <find>HashG2</find>
       <find>HashG1</find>
@@ -210,9 +212,10 @@
       <find>secr</find>
       <find>randomSecretKeySet</find>
       <find>Ma</find>
-      <find>encrypt</find>
       <find>print</find>
       <find>String</find>
+      <find>Encrypt</find>
+      <find>encrypt</find>
     </findStrings>
   </component>
   <component name="GOROOT" path="/usr/local/go" />
@@ -233,16 +236,16 @@
         <option value="$PROJECT_DIR$/../../phoreproject/bls/fq2.go" />
         <option value="$PROJECT_DIR$/../../phoreproject/bls/g2.go" />
         <option value="$PROJECT_DIR$/signature.go" />
-        <option value="$PROJECT_DIR$/utils.go" />
         <option value="$PROJECT_DIR$/poly_test.go" />
         <option value="$PROJECT_DIR$/../../bls/fr.go" />
         <option value="$PROJECT_DIR$/poly.go" />
-        <option value="$PROJECT_DIR$/public_key.go" />
         <option value="$PROJECT_DIR$/public_key_test.go" />
         <option value="$PROJECT_DIR$/secret_key_test.go" />
         <option value="$PROJECT_DIR$/secret_key.go" />
-        <option value="$PROJECT_DIR$/tpke_test.go" />
         <option value="$PROJECT_DIR$/tpke.go" />
+        <option value="$PROJECT_DIR$/public_key.go" />
+        <option value="$PROJECT_DIR$/tpke_test.go" />
+        <option value="$PROJECT_DIR$/utils.go" />
       </list>
     </option>
   </component>
@@ -312,7 +315,7 @@
       </list>
     </option>
   </component>
-  <component name="RunManager" selected="Go Test.TestCipherText_Serialize in github.com/boohyunsik/tpke">
+  <component name="RunManager" selected="Go Test.TestTPKE in github.com/boohyunsik/tpke">
     <configuration name="TestCipherText_Serialize in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
       <module name="tpke" />
       <working_directory value="$PROJECT_DIR$" />
@@ -335,7 +338,7 @@
       <pattern value="^TestPublicKeySet_Serialize$" />
       <method v="2" />
     </configuration>
-    <configuration name="TestPublicKey_Serialize in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
+    <configuration name="TestSecretKeySet in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
       <module name="tpke" />
       <working_directory value="$PROJECT_DIR$" />
       <framework value="gotest" />
@@ -343,10 +346,10 @@
       <package value="github.com/boohyunsik/tpke" />
       <directory value="$PROJECT_DIR$/" />
       <filePath value="$PROJECT_DIR$/" />
-      <pattern value="^TestPublicKey_Serialize$" />
+      <pattern value="^TestSecretKeySet$" />
       <method v="2" />
     </configuration>
-    <configuration name="TestSecretKeySet in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
+    <configuration name="TestSecretKey_Serialize in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
       <module name="tpke" />
       <working_directory value="$PROJECT_DIR$" />
       <framework value="gotest" />
@@ -354,10 +357,10 @@
       <package value="github.com/boohyunsik/tpke" />
       <directory value="$PROJECT_DIR$/" />
       <filePath value="$PROJECT_DIR$/" />
-      <pattern value="^TestSecretKeySet$" />
+      <pattern value="^TestSecretKey_Serialize$" />
       <method v="2" />
     </configuration>
-    <configuration name="TestSecretKey_Serialize in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
+    <configuration name="TestTPKE in github.com/boohyunsik/tpke" type="GoTestRunConfiguration" factoryName="Go Test" temporary="true" nameIsGenerated="true">
       <module name="tpke" />
       <working_directory value="$PROJECT_DIR$" />
       <framework value="gotest" />
@@ -365,36 +368,27 @@
       <package value="github.com/boohyunsik/tpke" />
       <directory value="$PROJECT_DIR$/" />
       <filePath value="$PROJECT_DIR$/" />
-      <pattern value="^TestSecretKey_Serialize$" />
+      <pattern value="^TestTPKE$" />
       <method v="2" />
     </configuration>
     <list>
-      <item itemvalue="Go Test.TestPublicKey_Serialize in github.com/boohyunsik/tpke" />
       <item itemvalue="Go Test.TestSecretKey_Serialize in github.com/boohyunsik/tpke" />
       <item itemvalue="Go Test.TestSecretKeySet in github.com/boohyunsik/tpke" />
       <item itemvalue="Go Test.TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" />
       <item itemvalue="Go Test.TestCipherText_Serialize in github.com/boohyunsik/tpke" />
+      <item itemvalue="Go Test.TestTPKE in github.com/boohyunsik/tpke" />
     </list>
     <recent_temporary>
       <list>
+        <item itemvalue="Go Test.TestTPKE in github.com/boohyunsik/tpke" />
         <item itemvalue="Go Test.TestCipherText_Serialize in github.com/boohyunsik/tpke" />
         <item itemvalue="Go Test.TestSecretKey_Serialize in github.com/boohyunsik/tpke" />
         <item itemvalue="Go Test.TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" />
         <item itemvalue="Go Test.TestSecretKeySet in github.com/boohyunsik/tpke" />
-        <item itemvalue="Go Test.TestPublicKey_Serialize in github.com/boohyunsik/tpke" />
       </list>
     </recent_temporary>
   </component>
   <component name="TestHistory">
-    <history-entry file="TestPublicKeySet_Serialize_in_github_com_boohyunsik_tpke - 2019.06.27 at 02h 04m 03s.xml">
-      <configuration name="TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
-    </history-entry>
-    <history-entry file="TestPublicKeySet_Serialize_in_github_com_boohyunsik_tpke - 2019.06.27 at 02h 04m 32s.xml">
-      <configuration name="TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
-    </history-entry>
-    <history-entry file="TestPublicKeySet_Serialize_in_github_com_boohyunsik_tpke - 2019.06.27 at 02h 04m 55s.xml">
-      <configuration name="TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
-    </history-entry>
     <history-entry file="TestPublicKeySet_Serialize_in_github_com_boohyunsik_tpke - 2019.06.27 at 02h 05m 21s.xml">
       <configuration name="TestPublicKeySet_Serialize in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
     </history-entry>
@@ -416,6 +410,15 @@
     <history-entry file="TestCipherText_Serialize_in_github_com_boohyunsik_tpke - 2019.06.29 at 16h 16m 12s.xml">
       <configuration name="TestCipherText_Serialize in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
     </history-entry>
+    <history-entry file="TestTPKE_in_github_com_boohyunsik_tpke - 2019.06.29 at 16h 55m 11s.xml">
+      <configuration name="TestTPKE in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="TestTPKE_in_github_com_boohyunsik_tpke - 2019.06.29 at 16h 55m 24s.xml">
+      <configuration name="TestTPKE in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
+    </history-entry>
+    <history-entry file="TestTPKE_in_github_com_boohyunsik_tpke - 2019.06.29 at 16h 55m 58s.xml">
+      <configuration name="TestTPKE in github.com/boohyunsik/tpke" configurationId="GoTestRunConfiguration" />
+    </history-entry>
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -430,32 +433,32 @@
     <frame x="0" y="0" width="1650" height="1050" extended-state="6" />
     <editor active="true" />
     <layout>
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.19216418" />
+      <window_info content_ui="combo" id="Project" order="0" weight="0.19216418" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Favorites" order="2" side_tool="true" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Find" order="1" />
       <window_info anchor="bottom" id="Run" order="2" weight="0.32883817" />
-      <window_info anchor="bottom" id="Debug" order="3" weight="0.39937758" />
+      <window_info active="true" anchor="bottom" id="Debug" order="3" visible="true" weight="0.39937758" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info anchor="bottom" id="TODO" order="6" weight="0.32987553" />
       <window_info anchor="bottom" id="Database Changes" order="7" show_stripe_button="false" />
       <window_info anchor="bottom" id="Version Control" order="8" show_stripe_button="false" />
       <window_info anchor="bottom" id="Event Log" order="9" side_tool="true" />
-      <window_info active="true" anchor="bottom" id="Terminal" order="10" visible="true" weight="0.32987553" />
+      <window_info anchor="bottom" id="Terminal" order="10" weight="0.32987553" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
       <window_info anchor="right" id="Database" order="3" />
     </layout>
     <layout-to-restore>
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.18681319" />
+      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.19216418" />
       <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
       <window_info id="Favorites" order="2" side_tool="true" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Find" order="1" />
-      <window_info active="true" anchor="bottom" id="Run" order="2" visible="true" weight="0.32987553" />
+      <window_info active="true" anchor="bottom" id="Run" order="2" visible="true" weight="0.32883817" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.39937758" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
@@ -636,6 +639,12 @@
           <properties />
           <option name="timeStamp" value="126" />
         </line-breakpoint>
+        <line-breakpoint enabled="true" type="DlvLineBreakpoint">
+          <url>file://$PROJECT_DIR$/utils.go</url>
+          <line>76</line>
+          <properties />
+          <option name="timeStamp" value="127" />
+        </line-breakpoint>
       </breakpoints>
     </breakpoint-manager>
     <watches-manager>
@@ -982,52 +991,52 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/public_key.go">
+    <entry file="file://$PROJECT_DIR$/../../bls/fqrepr.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="361">
-          <caret line="39" column="13" selection-start-line="39" selection-start-column="13" selection-end-line="39" selection-end-column="13" />
+        <state relative-caret-position="193">
+          <caret line="181" column="31" lean-forward="true" selection-start-line="181" selection-start-column="24" selection-end-line="181" selection-end-column="31" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/utils.go">
+    <entry file="file://$PROJECT_DIR$/../../bls/g2.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="136">
-          <caret line="71" column="5" selection-start-line="71" selection-start-column="5" selection-end-line="71" selection-end-column="5" />
+        <state relative-caret-position="285">
+          <caret line="176" column="39" lean-forward="true" selection-start-line="175" selection-start-column="4" selection-end-line="176" selection-end-column="39" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/../../bls/fqrepr.go">
+    <entry file="file:///usr/local/go/src/fmt/print.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="193">
-          <caret line="181" column="31" lean-forward="true" selection-start-line="181" selection-start-column="24" selection-end-line="181" selection-end-column="31" />
+        <state relative-caret-position="201">
+          <caret line="200" column="5" selection-start-line="200" selection-start-column="5" selection-end-line="200" selection-end-column="5" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/../../bls/g2.go">
+    <entry file="file://$PROJECT_DIR$/tpke.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="285">
-          <caret line="176" column="39" lean-forward="true" selection-start-line="175" selection-start-column="4" selection-end-line="176" selection-end-column="39" />
+        <state relative-caret-position="236">
+          <caret line="59" column="21" lean-forward="true" selection-start-line="59" selection-start-column="21" selection-end-line="59" selection-end-column="21" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/tpke_test.go">
+    <entry file="file://$PROJECT_DIR$/public_key.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1200">
-          <caret line="340" column="37" lean-forward="true" selection-start-line="340" selection-start-column="37" selection-end-line="340" selection-end-column="37" />
+        <state relative-caret-position="184">
+          <caret line="39" selection-start-line="39" selection-end-line="39" />
         </state>
       </provider>
     </entry>
-    <entry file="file:///usr/local/go/src/fmt/print.go">
+    <entry file="file://$PROJECT_DIR$/tpke_test.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="201">
-          <caret line="200" column="5" selection-start-line="200" selection-start-column="5" selection-end-line="200" selection-end-column="5" />
+        <state relative-caret-position="121">
+          <caret line="81" selection-start-line="81" selection-end-line="81" />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/tpke.go">
+    <entry file="file://$PROJECT_DIR$/utils.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="489">
-          <caret line="146" column="50" selection-start-line="146" selection-start-column="50" selection-end-line="146" selection-end-column="50" />
+        <state relative-caret-position="299">
+          <caret line="78" column="44" selection-start-line="78" selection-start-column="44" selection-end-line="78" selection-end-column="44" />
         </state>
       </provider>
     </entry>
diff --git a/public_key.go b/public_key.go
index 3043775..3e0e8ad 100644
--- a/public_key.go
+++ b/public_key.go
@@ -25,9 +25,9 @@ func (p *PublicKey) Verify(sig *Signature, msg []byte) bool {
 
 func (p *PublicKey) Encrypt(msg []byte) (*CipherText, error) {
 
-	if len(msg) > 32 {
-		return nil, nil
-	}
+	//if len(msg) > 32 {
+	//	return nil, nil
+	//}
 
 	r, err := bls.RandFR(rand.Reader)
 	if err != nil {
diff --git a/tpke_test.go b/tpke_test.go
index f817b1a..bbbffc4 100644
--- a/tpke_test.go
+++ b/tpke_test.go
@@ -88,7 +88,7 @@ func TestTPKE(t *testing.T) {
 	david := playGround.actors[3].id
 	eric := playGround.actors[4].id
 
-	msg := []byte("pizza pizza")
+	msg := []byte("pizza pizza pizza pizza pizza pizza pizza pizza pizza pizza pizza pizza pizza")
 	t.Logf("msg : %v", msg)
 	cipherText, err := pk.Encrypt(msg)
 
diff --git a/utils.go b/utils.go
index 2f84596..3e69220 100644
--- a/utils.go
+++ b/utils.go
@@ -76,7 +76,7 @@ func xorHash(g1 bls.G1Projective, msg []byte) []byte {
 	hashedG1 := hash.Sum(nil)
 	output := make([]byte, len(msg))
 	for i := range output {
-		output[i] = msg[i] ^ hashedG1[i]
+		output[i] = msg[i] ^ hashedG1[i % 32]
 	}
 	return output
 }