diff --git a/go.mod b/go.mod
index 386d587..7dffdc1 100644
--- a/go.mod
+++ b/go.mod
@@ -6,8 +6,8 @@ require (
 	github.com/antihax/optional v1.0.0
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
 	github.com/bronze1man/radius v0.0.0-20190516032554-afd8baec892d
-	github.com/free5gc/openapi v1.0.7-0.20230802173229-2b3ded4db293
-	github.com/free5gc/util v1.0.5-0.20231001095115-433858e5be94
+	github.com/free5gc/openapi v1.0.7-0.20231216094313-e15a4ff046f6
+	github.com/free5gc/util v1.0.5-0.20231205080047-308f623d6808
 	github.com/gin-gonic/gin v1.9.1
 	github.com/google/gopacket v1.1.19
 	github.com/google/uuid v1.3.0
diff --git a/go.sum b/go.sum
index ecef5d3..0947f12 100644
--- a/go.sum
+++ b/go.sum
@@ -61,10 +61,10 @@ github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.m
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/evanphx/json-patch v0.5.2/go.mod h1:ZWS5hhDbVDyob71nXKNL0+PWn6ToqBHMikGIFbs31qQ=
-github.com/free5gc/openapi v1.0.7-0.20230802173229-2b3ded4db293 h1:BSIvKCYu7646sE8J9R1L8v2R435otUik3wOFN33csfs=
-github.com/free5gc/openapi v1.0.7-0.20230802173229-2b3ded4db293/go.mod h1:iw/N0E+FlX44EEx24IBi2EdZW8v+bkj3ETWPGnlK9DI=
-github.com/free5gc/util v1.0.5-0.20231001095115-433858e5be94 h1:tNylIqH/m5Kq+3KuC+jjXGl06Y6EmM8yq61ZUgNrPBY=
-github.com/free5gc/util v1.0.5-0.20231001095115-433858e5be94/go.mod h1:aMszJZbCkcg5xaGgzya+55jz+OPMsJqPLq5Z3fWDFPE=
+github.com/free5gc/openapi v1.0.7-0.20231216094313-e15a4ff046f6 h1:8P/wOkTAQMgZJe9pUUNSTE5PWeAdlMrsU9kLsI+VAVE=
+github.com/free5gc/openapi v1.0.7-0.20231216094313-e15a4ff046f6/go.mod h1:qv9KqEucoZSeENPRFGxfTe+33ZWYyiYFx1Rj+H0DoWA=
+github.com/free5gc/util v1.0.5-0.20231205080047-308f623d6808 h1:8/IoWEgcO2DLlLCqbsxwduD7CzXdKe/BFJU2tcAqnxo=
+github.com/free5gc/util v1.0.5-0.20231205080047-308f623d6808/go.mod h1:d+79g84a3YHhzvjJ2IhurrBOavOA8xWIQ/GCywPXqQk=
 github.com/gabriel-vasile/mimetype v1.4.2 h1:w5qFW6JKBz9Y393Y4q372O9A7cUSequkh1Q7OhCmWKU=
 github.com/gabriel-vasile/mimetype v1.4.2/go.mod h1:zApsH/mKG4w07erKIaJPFiX0Tsq9BFQgN3qGY5GnNgA=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
@@ -308,7 +308,6 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
-golang.org/x/net v0.7.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
 golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
 golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
@@ -525,6 +524,7 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/internal/context/ausf_context_init.go b/internal/context/ausf_context_init.go
index 9bbc099..575a04f 100644
--- a/internal/context/ausf_context_init.go
+++ b/internal/context/ausf_context_init.go
@@ -22,6 +22,7 @@ func InitAusfContext(context *AUSFContext) {
 	context.NfId = uuid.New().String()
 	context.GroupID = configuration.GroupId
 	context.NrfUri = configuration.NrfUri
+	context.NrfCertPem = configuration.NrfCertPem
 	context.UriScheme = models.UriScheme(configuration.Sbi.Scheme) // default uri scheme
 	context.RegisterIPv4 = factory.AusfSbiDefaultIPv4              // default localhost
 	context.SBIPort = factory.AusfSbiDefaultPort                   // default port
diff --git a/internal/context/context.go b/internal/context/context.go
index 07a21be..53c3b03 100644
--- a/internal/context/context.go
+++ b/internal/context/context.go
@@ -1,11 +1,13 @@
 package context
 
 import (
+	"context"
 	"regexp"
 	"sync"
 
 	"github.com/free5gc/ausf/internal/logger"
 	"github.com/free5gc/openapi/models"
+	"github.com/free5gc/openapi/oauth"
 )
 
 type AUSFContext struct {
@@ -19,11 +21,13 @@ type AUSFContext struct {
 	Url                  string
 	UriScheme            models.UriScheme
 	NrfUri               string
+	NrfCertPem           string
 	NfService            map[models.ServiceName]models.NfService
 	PlmnList             []models.PlmnId
 	UdmUeauUrl           string
 	snRegex              *regexp.Regexp
 	EapAkaSupiImsiPrefix bool
+	OAuth2Required       bool
 }
 
 type AusfUeContext struct {
@@ -155,3 +159,13 @@ func GetSelf() *AUSFContext {
 func (a *AUSFContext) GetSelfID() string {
 	return a.NfId
 }
+
+func (c *AUSFContext) GetTokenCtx(scope, targetNF string) (
+	context.Context, *models.ProblemDetails, error,
+) {
+	if !c.OAuth2Required {
+		return context.TODO(), nil, nil
+	}
+	return oauth.GetTokenCtx(models.NfType_AUSF,
+		c.NfId, c.NrfUri, scope, targetNF)
+}
diff --git a/internal/sbi/consumer/nf_discovery.go b/internal/sbi/consumer/nf_discovery.go
index 59035ec..6278fde 100644
--- a/internal/sbi/consumer/nf_discovery.go
+++ b/internal/sbi/consumer/nf_discovery.go
@@ -1,10 +1,10 @@
 package consumer
 
 import (
-	"context"
 	"fmt"
 	"net/http"
 
+	ausf_context "github.com/free5gc/ausf/internal/context"
 	"github.com/free5gc/ausf/internal/logger"
 	"github.com/free5gc/openapi/Nnrf_NFDiscovery"
 	"github.com/free5gc/openapi/models"
@@ -13,11 +13,16 @@ import (
 func SendSearchNFInstances(nrfUri string, targetNfType, requestNfType models.NfType,
 	param Nnrf_NFDiscovery.SearchNFInstancesParamOpts,
 ) (*models.SearchResult, error) {
+	ctx, _, err := ausf_context.GetSelf().GetTokenCtx("nnrf-disc", "NRF")
+	if err != nil {
+		return nil, err
+	}
+
 	configuration := Nnrf_NFDiscovery.NewConfiguration()
 	configuration.SetBasePath(nrfUri)
 	client := Nnrf_NFDiscovery.NewAPIClient(configuration)
 
-	result, rsp, rspErr := client.NFInstancesStoreApi.SearchNFInstances(context.TODO(),
+	result, rsp, rspErr := client.NFInstancesStoreApi.SearchNFInstances(ctx,
 		targetNfType, requestNfType, &param)
 	if rspErr != nil {
 		return nil, fmt.Errorf("NFInstancesStoreApi Response error: %+w", rspErr)
diff --git a/internal/sbi/consumer/nf_management.go b/internal/sbi/consumer/nf_management.go
index 4c4cc8e..3a156c4 100644
--- a/internal/sbi/consumer/nf_management.go
+++ b/internal/sbi/consumer/nf_management.go
@@ -33,8 +33,8 @@ func BuildNFInstance(ausfContext *ausf_context.AUSFContext) (profile models.NfPr
 	return
 }
 
-// func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfile) (resouceNrfUri string,
-//    retrieveNfInstanceID string, err error) {
+// func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfile,
+// ) (resouceNrfUri string,retrieveNfInstanceID string, err error) {
 func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfile) (string, string, error) {
 	configuration := Nnrf_NFManagement.NewConfiguration()
 	configuration.SetBasePath(nrfUri)
@@ -42,8 +42,8 @@ func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfil
 
 	var res *http.Response
 	for {
-		if _, resTmp, err := client.NFInstanceIDDocumentApi.RegisterNFInstance(context.TODO(), nfInstanceId,
-			profile); err != nil || resTmp == nil {
+		nf, resTmp, err := client.NFInstanceIDDocumentApi.RegisterNFInstance(context.TODO(), nfInstanceId, profile)
+		if err != nil || resTmp == nil {
 			logger.ConsumerLog.Errorf("AUSF register to NRF Error[%v]", err)
 			time.Sleep(2 * time.Second)
 			continue
@@ -64,6 +64,20 @@ func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfil
 			resourceUri := res.Header.Get("Location")
 			resourceNrfUri := resourceUri[:strings.Index(resourceUri, "/nnrf-nfm/")]
 			retrieveNfInstanceID := resourceUri[strings.LastIndex(resourceUri, "/")+1:]
+
+			oauth2 := false
+			if nf.CustomInfo != nil {
+				v, ok := nf.CustomInfo["oauth2"].(bool)
+				if ok {
+					oauth2 = v
+					logger.MainLog.Infoln("OAuth2 setting receive from NRF:", oauth2)
+				}
+			}
+			ausf_context.GetSelf().OAuth2Required = oauth2
+			if oauth2 && ausf_context.GetSelf().NrfCertPem == "" {
+				logger.CfgLog.Error("OAuth2 enable but no nrfCertPem provided in config.")
+			}
+
 			return resourceNrfUri, retrieveNfInstanceID, nil
 		} else {
 			fmt.Println(fmt.Errorf("handler returned wrong status code %d", status))
@@ -76,13 +90,18 @@ func SendRegisterNFInstance(nrfUri, nfInstanceId string, profile models.NfProfil
 func SendDeregisterNFInstance() (*models.ProblemDetails, error) {
 	logger.ConsumerLog.Infof("Send Deregister NFInstance")
 
+	ctx, pd, err := ausf_context.GetSelf().GetTokenCtx("nnrf-nfm", "NRF")
+	if err != nil {
+		return pd, err
+	}
+
 	ausfSelf := ausf_context.GetSelf()
 	// Set client and set url
 	configuration := Nnrf_NFManagement.NewConfiguration()
 	configuration.SetBasePath(ausfSelf.NrfUri)
 	client := Nnrf_NFManagement.NewAPIClient(configuration)
 
-	res, err := client.NFInstanceIDDocumentApi.DeregisterNFInstance(context.Background(), ausfSelf.NfId)
+	res, err := client.NFInstanceIDDocumentApi.DeregisterNFInstance(ctx, ausfSelf.NfId)
 	if err == nil {
 		return nil, err
 	} else if res != nil {
diff --git a/internal/sbi/producer/functions.go b/internal/sbi/producer/functions.go
index 393fd82..2999659 100644
--- a/internal/sbi/producer/functions.go
+++ b/internal/sbi/producer/functions.go
@@ -135,7 +135,7 @@ func EapEncodeAttribute(attributeType string, data string) (string, error) {
 }
 
 // func eapAkaPrimePrf(ikPrime string, ckPrime string, identity string) (K_encr string, K_aut string, K_re string,
-//    MSK string, EMSK string) {
+// MSK string, EMSK string) {
 func eapAkaPrimePrf(ikPrime string, ckPrime string, identity string) ([]byte, []byte, []byte, []byte, []byte) {
 	keyAp := ikPrime + ckPrime
 
diff --git a/internal/sbi/producer/ue_authentication.go b/internal/sbi/producer/ue_authentication.go
index fae4e69..0fbf190 100644
--- a/internal/sbi/producer/ue_authentication.go
+++ b/internal/sbi/producer/ue_authentication.go
@@ -81,8 +81,8 @@ func HandleUeAuthPostRequest(request *httpwrapper.Request) *httpwrapper.Response
 	return httpwrapper.NewResponse(http.StatusForbidden, nil, problemDetails)
 }
 
-// func UeAuthPostRequestProcedure(updateAuthenticationInfo models.AuthenticationInfo) (
-//    response *models.UeAuthenticationCtx, locationURI string, problemDetails *models.ProblemDetails) {
+// func UeAuthPostRequestProcedure(updateAuthenticationInfo models.AuthenticationInfo,
+// ) (response *models.UeAuthenticationCtx, locationURI string, problemDetails *models.ProblemDetails) {
 func UeAuthPostRequestProcedure(updateAuthenticationInfo models.AuthenticationInfo) (*models.UeAuthenticationCtx,
 	string, *models.ProblemDetails,
 ) {
diff --git a/pkg/factory/config.go b/pkg/factory/config.go
index a24ef32..2545100 100644
--- a/pkg/factory/config.go
+++ b/pkg/factory/config.go
@@ -57,6 +57,7 @@ type Configuration struct {
 	Sbi                  *Sbi            `yaml:"sbi,omitempty" valid:"required"`
 	ServiceNameList      []string        `yaml:"serviceNameList,omitempty" valid:"required"`
 	NrfUri               string          `yaml:"nrfUri,omitempty" valid:"url,required"`
+	NrfCertPem           string          `yaml:"nrfCertPem,omitempty" valid:"optional"`
 	PlmnSupportList      []models.PlmnId `yaml:"plmnSupportList,omitempty" valid:"required"`
 	GroupId              string          `yaml:"groupId,omitempty" valid:"type(string),minstringlength(1)"`
 	EapAkaSupiImsiPrefix bool            `yaml:"eapAkaSupiImsiPrefix,omitempty" valid:"type(bool),optional"`