diff --git a/clientApp/GUI/css/bootstrapMaterial-dark-overwrite.css b/clientApp/GUI/css/bootstrapMaterial-dark-overwrite.css
index 447b35a..259f10a 100644
--- a/clientApp/GUI/css/bootstrapMaterial-dark-overwrite.css
+++ b/clientApp/GUI/css/bootstrapMaterial-dark-overwrite.css
@@ -1,9 +1,14 @@
 body {
+    /*background: #15191e!important;*/
     background: #000000!important;
     color: #ffffff!important;
 }
 .card {
+    /*background: #1f262d!important;*/
+    /*background: #15191e!important;
+    color: #ffffff!important;*/
+    /*border: 1px solid #ffffff!important;*/
+
     background: #000000!important;
     color: #ffffff!important;
-    border: 1px solid #ffffff!important;
 }
diff --git a/clientApp/GUI/css/own.css b/clientApp/GUI/css/own.css
index 8b13789..2a2678b 100644
--- a/clientApp/GUI/css/own.css
+++ b/clientApp/GUI/css/own.css
@@ -1 +1,5 @@
-
+.o_nav {
+    background: #000000!important;
+    color: #ffffff!important;
+    border-bottom: 2px solid #4DD0E1!important;
+}
diff --git a/clientApp/GUI/img/blockchainIDsystem-logo.xcf b/clientApp/GUI/img/blockchainIDsystem-logo.xcf
new file mode 100644
index 0000000..56a372d
Binary files /dev/null and b/clientApp/GUI/img/blockchainIDsystem-logo.xcf differ
diff --git a/clientApp/GUI/img/blockchainIDsystem-logo01.png b/clientApp/GUI/img/blockchainIDsystem-logo01.png
new file mode 100644
index 0000000..8165571
Binary files /dev/null and b/clientApp/GUI/img/blockchainIDsystem-logo01.png differ
diff --git a/clientApp/GUI/img/blockchainIDsystem-logo02.png b/clientApp/GUI/img/blockchainIDsystem-logo02.png
new file mode 100644
index 0000000..04fb61b
Binary files /dev/null and b/clientApp/GUI/img/blockchainIDsystem-logo02.png differ
diff --git a/clientApp/GUI/views/login/login.html b/clientApp/GUI/views/login/login.html
index 57773ec..19b90d2 100755
--- a/clientApp/GUI/views/login/login.html
+++ b/clientApp/GUI/views/login/login.html
@@ -5,16 +5,16 @@
         </div>
         <div class="col-sm-4">
             <div class="card">
+                <img src="img/blockchainIDsystem-logo01.png" class="img-responsive" />
                 <div class="card-body">
                     <h4 class="card-title">
                         blockchainIDsystem
                     </h4>
-
                     <input ng-model="user.email" class="form-control" placeholder="Email" type="text">
                     <input ng-model="user.password" class="form-control" placeholder="Password" type="password">
 
 
-                    <div ng-click="login()" class="btn btn-raised c_indigo300 pull-right">Login</div>
+                    <div ng-click="login()" class="btn btn-raised btn-block c_o_cyan300 pull-right">Login</div>
                 </div>
             </div>
         </div>
diff --git a/clientApp/GUI/views/main/main.html b/clientApp/GUI/views/main/main.html
index 1565504..1889245 100755
--- a/clientApp/GUI/views/main/main.html
+++ b/clientApp/GUI/views/main/main.html
@@ -1,29 +1,37 @@
 <div class="container">
     <div class="row">
-        <div class="col-sm-4">
+        <div class="col-sm-2">
 
         </div>
-        <div class="col-sm-4">
+        <div class="col-sm-8">
             <div class="card">
                 <div class="card-body">
                     <h4 class="card-title">
                         blockchainIDsystem
                     </h4>
-
-                    <div ng-click="newID()" class="btn btn-raised c_o_cyan300">Create new ID</div>
+                    <p>
+                        Generate new ID
+                        <div ng-click="newID()" class="btn btn-raised pull-right c_o_cyan300">Create new ID</div>
+                    </p>
                 </div>
-                <hr>
                 <div class="card-body">
                     <h4 class="card-title">
                         Current IDs
                     </h4>
-                    <p ng-repeat="id in ids">
-                        {{id}} <div ng-click="" class="btn btn-raised c_o_indigo300">Verify</div>
-                    </p>
+                    <div class="row" ng-repeat="id in ids">
+                        <div class="col-sm-6">
+                            Public Key: {{id.pubK}}
+                            <br> Private Key: {{id.privK}}
+                            <br> Date of creation: {{id.date}}
+                        </div>
+                        <div class="col-sm-6">
+                            <div ng-click="blindAndVerify(id.pubK)" class="btn btn-raised c_o_indigo300">Blind & Send to serverIDsigner</div>
+                        </div>
+                    </div>
                 </div>
             </div>
         </div>
-        <div class="col-sm-4">
+        <div class="col-sm-2">
 
         </div>
 
diff --git a/clientApp/GUI/views/main/main.js b/clientApp/GUI/views/main/main.js
index 63c3d2a..7591b0d 100755
--- a/clientApp/GUI/views/main/main.js
+++ b/clientApp/GUI/views/main/main.js
@@ -32,4 +32,16 @@ angular.module('app.main', ['ngRoute'])
                     console.log('data error');
                 });
         };
+
+        $scope.blindAndVerify = function(pubK) {
+            $http.get(clientapi + 'blindandverify/' + pubK)
+                .then(function(data) {
+                    console.log('data success');
+                    console.log(data);
+                    $scope.ids = data.data;
+
+                }, function(data) {
+                    console.log('data error');
+                });
+        };
     });
diff --git a/clientApp/GUI/views/navbar.html b/clientApp/GUI/views/navbar.html
index c350386..77da717 100755
--- a/clientApp/GUI/views/navbar.html
+++ b/clientApp/GUI/views/navbar.html
@@ -1,5 +1,5 @@
 <div ng-controller="NavbarCtrl" ng-show="user">
-    <nav class="navbar navbar-fixed-top c_cyanG500to300">
+    <nav class="navbar navbar-fixed-top o_nav">
         <div class="container-fluid">
             <div class="navbar-header">
                 <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-responsive-collapse">
diff --git a/clientApp/clientAppRESTFunctions.go b/clientApp/clientAppRESTFunctions.go
index 52d439a..f185390 100644
--- a/clientApp/clientAppRESTFunctions.go
+++ b/clientApp/clientAppRESTFunctions.go
@@ -1,11 +1,15 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"time"
 
 	ownrsa "./ownrsa"
+	"github.com/fatih/color"
+	"github.com/gorilla/mux"
 )
 
 //generate key pair
@@ -30,6 +34,7 @@ func NewID(w http.ResponseWriter, r *http.Request) {
 	newKey := ownrsa.GenerateKeyPair()
 
 	key := ownrsa.PackKey(newKey)
+	key.Date = time.Now()
 	fmt.Println(key)
 
 	keys := readKeys("keys.json")
@@ -40,3 +45,71 @@ func NewID(w http.ResponseWriter, r *http.Request) {
 	check(err)
 	fmt.Fprintln(w, string(jResp))
 }
+
+type AskBlindSign struct {
+	M string `json:"m"`
+}
+
+func BlindAndVerify(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	packPubK := vars["pubK"]
+	color.Green(packPubK)
+
+	//read the keys stored in /keys directory
+	keys := readKeys("keys.json")
+
+	var key ownrsa.RSA
+	//search for complete key
+	for _, k := range keys {
+		fmt.Println(k.PubK)
+		fmt.Println(packPubK)
+		fmt.Println("")
+		if k.PubK == packPubK {
+			key = ownrsa.UnpackKey(k)
+		}
+	}
+	//blind the key.PubK
+	var m []int
+	//convert packPubK to []bytes
+	mBytes := []byte(packPubK)
+	for _, byte := range mBytes {
+		m = append(m, int(byte))
+	}
+	rVal := 101
+	blinded := ownrsa.Blind(m, rVal, key.PubK, key.PrivK)
+	fmt.Println(blinded)
+
+	//convert blinded to string
+	var askBlindSign AskBlindSign
+	askBlindSign.M = ownrsa.ArrayIntToString(blinded, "_")
+
+	//send to the serverIDsigner the key.PubK blinded
+	color.Green(askBlindSign.M)
+	body := new(bytes.Buffer)
+	json.NewEncoder(body).Encode(askBlindSign)
+	res, err := http.Post("http://"+config.ServerIDSigner.IP+":"+config.ServerIDSigner.Port+"/blindsign", "application/json", body)
+	check(err)
+	fmt.Println(res)
+
+	decoder := json.NewDecoder(res.Body)
+	//var sigmaString string
+	err = decoder.Decode(&askBlindSign)
+	if err != nil {
+		panic(err)
+	}
+	defer r.Body.Close()
+
+	fmt.Println("sigmaString")
+	fmt.Println(askBlindSign)
+	sigma := ownrsa.StringToArrayInt(askBlindSign.M, "_")
+	fmt.Println(sigma)
+
+	//unblind the response
+	//TODO
+	//després de la blindsign response, demanar al serverIDsigner la pubK
+	//unblinded := ownrsa.Unblind(sigma, rVal, )
+
+	jResp, err := json.Marshal(keys)
+	check(err)
+	fmt.Fprintln(w, string(jResp))
+}
diff --git a/clientApp/config.json b/clientApp/config.json
index 911b302..1de1c09 100755
--- a/clientApp/config.json
+++ b/clientApp/config.json
@@ -1,4 +1,8 @@
 {
     "port": "4100",
-    "keysDirectory": "keys"
+    "keysDirectory": "keys",
+    "serverIDsigner": {
+        "ip": "127.0.0.1",
+        "port": "3130"
+    }
 }
diff --git a/clientApp/main.go b/clientApp/main.go
index 03a1233..77b6cd1 100644
--- a/clientApp/main.go
+++ b/clientApp/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"net/http"
 
@@ -12,6 +13,7 @@ func main() {
 	color.Blue("Starting blockchainIDsystem clientApp")
 
 	readConfig("config.json")
+	fmt.Println(config)
 
 	//run thw webserver
 	go GUI()
diff --git a/clientApp/ownrsa/rsa.go b/clientApp/ownrsa/rsa.go
index eff6848..86c28e5 100644
--- a/clientApp/ownrsa/rsa.go
+++ b/clientApp/ownrsa/rsa.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math/big"
 	"math/rand"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -27,6 +28,13 @@ type RSA struct {
 	PrivK RSAPrivateKey
 }
 
+type PackRSA struct {
+	PubK       string    `json:"pubK"`
+	PrivK      string    `json:"privK"`
+	Date       time.Time `json:"date"`
+	PubKSigned string    `json:"pubKSigned"`
+}
+
 const maxPrime = 500
 const minPrime = 100
 
@@ -113,11 +121,11 @@ func Blind(m []int, r int, pubK RSAPublicKey, privK RSAPrivateKey) []int {
 	return mBlinded
 }
 
-func BlindSign(m []int, pubK RSAPublicKey, privK RSAPrivateKey) []int {
+func BlindSign(m []int, privK RSAPrivateKey) []int {
 	var r []int
 	for i := 0; i < len(m); i++ {
 		mBigInt := big.NewInt(int64(m[i]))
-		sigma := new(big.Int).Exp(mBigInt, privK.D, pubK.N)
+		sigma := new(big.Int).Exp(mBigInt, privK.D, privK.N)
 		r = append(r, int(sigma.Int64()))
 	}
 	return r
@@ -183,11 +191,6 @@ func PubKStringToBigInt(kS RSAPublicKeyString) (RSAPublicKey, error) {
 	return k, nil
 }
 
-type PackRSA struct {
-	PubK  string `json:"pubK"`
-	PrivK string `json:"privK"`
-}
-
 func PackKey(k RSA) PackRSA {
 	var p PackRSA
 	p.PubK = k.PubK.E.String() + "," + k.PubK.N.String()
@@ -207,3 +210,19 @@ func UnpackKey(p PackRSA) RSA {
 	}
 	return k
 }
+
+func ArrayIntToString(a []int, delim string) string {
+	return strings.Trim(strings.Replace(fmt.Sprint(a), " ", delim, -1), "[]")
+}
+func StringToArrayInt(s string, delim string) []int {
+	var a []int
+	arrayString := strings.Split(s, delim)
+	for _, s := range arrayString {
+		i, err := strconv.Atoi(s)
+		if err != nil {
+			fmt.Println(err)
+		}
+		a = append(a, i)
+	}
+	return a
+}
diff --git a/clientApp/readConfig.go b/clientApp/readConfig.go
index 19c59b7..dd48e73 100755
--- a/clientApp/readConfig.go
+++ b/clientApp/readConfig.go
@@ -7,8 +7,13 @@ import (
 
 //Config reads the config
 type Config struct {
-	Port          string `json:"port"`
-	KeysDirectory string `json:"keysDirectory"`
+	Port           string `json:"port"`
+	KeysDirectory  string `json:"keysDirectory"`
+	ServerIDSigner Server `json:"serverIDsigner"`
+}
+type Server struct {
+	IP   string `json:"ip"`
+	Port string `json:"port"`
 }
 
 var config Config
diff --git a/clientApp/restRoutes.go b/clientApp/restRoutes.go
index 6419009..6cff6c7 100755
--- a/clientApp/restRoutes.go
+++ b/clientApp/restRoutes.go
@@ -21,4 +21,10 @@ var routes = Routes{
 		"/newid",
 		NewID,
 	},
+	Route{
+		"BlindAndVerify",
+		"GET",
+		"/blindandverify/{pubK}",
+		BlindAndVerify,
+	},
 }
diff --git a/serverIDsigner/ownrsa/rsa.go b/serverIDsigner/ownrsa/rsa.go
index eff6848..86c28e5 100644
--- a/serverIDsigner/ownrsa/rsa.go
+++ b/serverIDsigner/ownrsa/rsa.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math/big"
 	"math/rand"
+	"strconv"
 	"strings"
 	"time"
 )
@@ -27,6 +28,13 @@ type RSA struct {
 	PrivK RSAPrivateKey
 }
 
+type PackRSA struct {
+	PubK       string    `json:"pubK"`
+	PrivK      string    `json:"privK"`
+	Date       time.Time `json:"date"`
+	PubKSigned string    `json:"pubKSigned"`
+}
+
 const maxPrime = 500
 const minPrime = 100
 
@@ -113,11 +121,11 @@ func Blind(m []int, r int, pubK RSAPublicKey, privK RSAPrivateKey) []int {
 	return mBlinded
 }
 
-func BlindSign(m []int, pubK RSAPublicKey, privK RSAPrivateKey) []int {
+func BlindSign(m []int, privK RSAPrivateKey) []int {
 	var r []int
 	for i := 0; i < len(m); i++ {
 		mBigInt := big.NewInt(int64(m[i]))
-		sigma := new(big.Int).Exp(mBigInt, privK.D, pubK.N)
+		sigma := new(big.Int).Exp(mBigInt, privK.D, privK.N)
 		r = append(r, int(sigma.Int64()))
 	}
 	return r
@@ -183,11 +191,6 @@ func PubKStringToBigInt(kS RSAPublicKeyString) (RSAPublicKey, error) {
 	return k, nil
 }
 
-type PackRSA struct {
-	PubK  string `json:"pubK"`
-	PrivK string `json:"privK"`
-}
-
 func PackKey(k RSA) PackRSA {
 	var p PackRSA
 	p.PubK = k.PubK.E.String() + "," + k.PubK.N.String()
@@ -207,3 +210,19 @@ func UnpackKey(p PackRSA) RSA {
 	}
 	return k
 }
+
+func ArrayIntToString(a []int, delim string) string {
+	return strings.Trim(strings.Replace(fmt.Sprint(a), " ", delim, -1), "[]")
+}
+func StringToArrayInt(s string, delim string) []int {
+	var a []int
+	arrayString := strings.Split(s, delim)
+	for _, s := range arrayString {
+		i, err := strconv.Atoi(s)
+		if err != nil {
+			fmt.Println(err)
+		}
+		a = append(a, i)
+	}
+	return a
+}
diff --git a/serverIDsigner/testUser.sh b/serverIDsigner/testUser.sh
index 01b1ef7..521765b 100644
--- a/serverIDsigner/testUser.sh
+++ b/serverIDsigner/testUser.sh
@@ -10,9 +10,9 @@ curl -X POST http://127.0.0.1:3130/login -d '{"email": "user1@e.com", "password"
 echo ""
 echo "send pubK and m to blind sign"
 echo "json to send to the serverIDsigner:"
-echo '{"pubKstring": {"e": "65537", "n": "139093"}, "m": "hola"}'
+echo '{"m": "hola"}'
 echo "serverIDsigner response:"
-BLINDSIGNED=$(curl -X POST http://127.0.0.1:3130/blindsign -d '{"pubKstring": {"e": "65537", "n": "139093"}, "m": "hola"}')
+BLINDSIGNED=$(curl -X POST http://127.0.0.1:3130/blindsign -d '{"m": "hola"}')
 echo "$BLINDSIGNED"
 
 echo ""
diff --git a/serverIDsigner/userRESTFunctions.go b/serverIDsigner/userRESTFunctions.go
index c716b7c..cacb803 100644
--- a/serverIDsigner/userRESTFunctions.go
+++ b/serverIDsigner/userRESTFunctions.go
@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/fatih/color"
 	"gopkg.in/mgo.v2/bson"
 
 	ownrsa "./ownrsa"
@@ -96,13 +97,12 @@ type Sign struct {
 }
 
 type AskBlindSign struct {
-	PubKString ownrsa.RSAPublicKeyString `json:"pubKstring"`
-	PubK       ownrsa.RSAPublicKey       `json:"pubK"`
-	M          string                    `json:"m"`
+	/*PubKString ownrsa.RSAPublicKeyString `json:"pubKstring"`
+	PubK       ownrsa.RSAPublicKey       `json:"pubK"`*/
+	M string `json:"m"`
 }
 
 func BlindSign(w http.ResponseWriter, r *http.Request) {
-	fmt.Println(r.Body)
 	decoder := json.NewDecoder(r.Body)
 	var askBlindSign AskBlindSign
 	err := decoder.Decode(&askBlindSign)
@@ -110,26 +110,36 @@ func BlindSign(w http.ResponseWriter, r *http.Request) {
 		panic(err)
 	}
 	defer r.Body.Close()
-
+	color.Red(askBlindSign.M)
 	fmt.Println(askBlindSign)
+
+	/*fmt.Println(askBlindSign)
 	askBlindSign.PubK, err = ownrsa.PubKStringToBigInt(askBlindSign.PubKString)
 	if err != nil {
 		fmt.Fprintln(w, "error")
 		return
-	}
+	}*/
 
 	//convert msg to []int
-	var m []int
+	/*var m []int
 	mBytes := []byte(askBlindSign.M)
 	for _, byte := range mBytes {
 		m = append(m, int(byte))
-	}
+	}*/
 
-	sigma := ownrsa.BlindSign(m, askBlindSign.PubK, serverRSA.PrivK) //here the privK will be the CA privK, not the m emmiter's one. The pubK is the user's one
+	m := ownrsa.StringToArrayInt(askBlindSign.M, "_")
+
+	sigma := ownrsa.BlindSign(m, serverRSA.PrivK) //here the privK will be the CA privK, not the m emmiter's one. The pubK is the user's one
 	fmt.Print("Sigma': ")
 	fmt.Println(sigma)
+	sigmaString := ownrsa.ArrayIntToString(sigma, "_")
+	askBlindSign.M = sigmaString
 
-	fmt.Fprintln(w, sigma)
+	jResp, err := json.Marshal(askBlindSign)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Fprintln(w, string(jResp))
 }
 
 type PetitionVerifySign struct {