diff --git a/libgm/crypto/ecdsa.go b/libgm/crypto/ecdsa.go
index 79ceeeb..12b0d77 100644
--- a/libgm/crypto/ecdsa.go
+++ b/libgm/crypto/ecdsa.go
@@ -5,6 +5,7 @@ import (
 	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/sha256"
+	"crypto/x509"
 	"encoding/base64"
 	"fmt"
 	"math/big"
@@ -64,12 +65,12 @@ func (t *JWK) GetPublicKey() (*ecdsa.PublicKey, error) {
 	return pubKey, nil
 }
 
-func (t *JWK) MarshalPubKey() ([]byte, error) {
+func (t *JWK) MarshalX509PublicKey() ([]byte, error) {
 	pubKey, err := t.GetPublicKey()
 	if err != nil {
 		return nil, err
 	}
-	return elliptic.Marshal(pubKey.Curve, pubKey.X, pubKey.Y), nil
+	return x509.MarshalPKIXPublicKey(pubKey)
 }
 
 func (t *JWK) SignRequest(requestID string, timestamp int64) ([]byte, error) {
diff --git a/libgm/crypto/encode.go b/libgm/crypto/encode.go
deleted file mode 100644
index 0b1591f..0000000
--- a/libgm/crypto/encode.go
+++ /dev/null
@@ -1,45 +0,0 @@
-package crypto
-
-var SequenceOne = []int{1, 2, 840, 10045, 2, 1}
-var SequenceTwo = []int{1, 2, 840, 10045, 3, 1, 7}
-
-func EncodeValues(a *[]byte, b []int) {
-	*a = append(*a, 6)
-	idx := len(*a)
-	*a = append(*a, 0)
-	*a = append(*a, byte(40*b[0]+b[1]))
-	for i := 2; i < len(b); i++ {
-		d := b[i]
-		e := make([]byte, 0)
-		if d > 128 {
-			e = append(e, byte(d/128)+128)
-		}
-		e = append(e, byte(d%128))
-		*a = append(*a, e...)
-	}
-	(*a)[idx] = byte(len(*a) - idx - 1)
-}
-
-func AppendBytes(a []byte, b []byte) []byte {
-	newA := make([]byte, len(a))
-	copy(newA, a)
-
-	newA = HelperAppendBytes(newA, 48)
-	newA = HelperAppendBytes(newA, byte(len(b)))
-	for _, value := range b {
-		newA = HelperAppendBytes(newA, value)
-	}
-	return newA
-}
-
-func HelperAppendBytes(a []byte, b byte) []byte {
-	return append(a, b)
-}
-
-func AppendByteSequence(byteArr1 []byte, byteArr2 []byte, uncompressedPublicKey []byte) []byte {
-	copiedByteArray := AppendBytes(byteArr1, byteArr2)
-	copiedByteArray = HelperAppendBytes(copiedByteArray, 3)
-	copiedByteArray = HelperAppendBytes(copiedByteArray, uint8(len(uncompressedPublicKey)+1))
-	copiedByteArray = HelperAppendBytes(copiedByteArray, 0)
-	return copiedByteArray
-}
diff --git a/libgm/payload/registerPhoneRelay.go b/libgm/payload/registerPhoneRelay.go
index 3a468a0..41ca218 100644
--- a/libgm/payload/registerPhoneRelay.go
+++ b/libgm/payload/registerPhoneRelay.go
@@ -11,9 +11,9 @@ import (
 func RegisterPhoneRelay(jwk *crypto.JWK) ([]byte, *binary.AuthenticationContainer, error) {
 	id := util.RandomUUIDv4()
 
-	encryptedKeys, encryptErr := uncompressKey(jwk)
-	if encryptErr != nil {
-		return nil, nil, encryptErr
+	key, err := jwk.MarshalX509PublicKey()
+	if err != nil {
+		return nil, nil, err
 	}
 
 	payloadData := &binary.AuthenticationContainer{
@@ -27,7 +27,7 @@ func RegisterPhoneRelay(jwk *crypto.JWK) ([]byte, *binary.AuthenticationContaine
 			KeyData: &binary.KeyData{
 				EcdsaKeys: &binary.ECDSAKeys{
 					Field1:        2,
-					EncryptedKeys: encryptedKeys,
+					EncryptedKeys: key,
 				},
 			},
 		},
@@ -38,23 +38,3 @@ func RegisterPhoneRelay(jwk *crypto.JWK) ([]byte, *binary.AuthenticationContaine
 	}
 	return encoded, payloadData, nil
 }
-
-func uncompressKey(jwk *crypto.JWK) ([]byte, error) {
-	uncompressedPublicKey, err3 := jwk.MarshalPubKey()
-	if err3 != nil {
-		return nil, err3
-	}
-	var emptyByteArray []byte
-	crypto.EncodeValues(&emptyByteArray, crypto.SequenceOne)
-	crypto.EncodeValues(&emptyByteArray, crypto.SequenceTwo)
-
-	var copiedByteArray []byte
-	copiedByteArray = crypto.AppendByteSequence(copiedByteArray, emptyByteArray, uncompressedPublicKey)
-	for _, value := range uncompressedPublicKey {
-		copiedByteArray = crypto.HelperAppendBytes(copiedByteArray, value)
-	}
-
-	var encryptedKeys []byte
-	encryptedKeys = crypto.AppendBytes(encryptedKeys, copiedByteArray[0:])
-	return encryptedKeys, nil
-}