diff --git a/sign/ecdsa.go b/sign/ecdsa.go
index 1c14ebb..f2f61f7 100644
--- a/sign/ecdsa.go
+++ b/sign/ecdsa.go
@@ -18,6 +18,7 @@ import (
 	"crypto/ed25519"
 	"crypto/rand"
 	"encoding/hex"
+	"errors"
 )
 
 // To generate key value pairs using ed25519
@@ -60,6 +61,11 @@ func Verifysign(publickey string, digest string, sign string) (bool,error) {
 		return false,err
 	}
 
+	if len(public_key)<32 || len(public_key)>32{
+		err:=errors.New("Wrong key size")
+		return false,err
+	}
+
 	message_digest, err:= hex.DecodeString(digest)
 	if err!=nil{
 		return false,err