diff --git a/authutils/auth_service.go b/authutils/auth_service.go
index a6899df1..a9d97364 100755
--- a/authutils/auth_service.go
+++ b/authutils/auth_service.go
@@ -18,6 +18,11 @@ import (
 
 // Extracts the signer address from signature given the signature
 // It returns signer address and error. nil error indicates the successful function execution
+
+const (
+	AllowedBlockChainDifference = 5
+)
+
 func GetSignerAddressFromMessage(message, signature []byte) (signer *common.Address, err error) {
 	log := log.WithFields(log.Fields{
 		"message":   blockchain.BytesToBase64(message),
@@ -71,8 +76,8 @@ func CompareWithLatestBlockNumber(blockNumberPassed *big.Int) error {
 		return err
 	}
 	differenceInBlockNumber := blockNumberPassed.Sub(blockNumberPassed, latestBlockNumber)
-	if differenceInBlockNumber.Abs(differenceInBlockNumber).Uint64() > 5 {
-		return fmt.Errorf("difference between the latest block chain number and the block number passed is %v ", differenceInBlockNumber)
+	if differenceInBlockNumber.Abs(differenceInBlockNumber).Uint64() > AllowedBlockChainDifference {
+		return fmt.Errorf("authentication failed as the signature passed has expired")
 	}
 	return nil
 }
diff --git a/authutils/auth_service_test.go b/authutils/auth_service_test.go
index e6a974b6..6bf9271c 100644
--- a/authutils/auth_service_test.go
+++ b/authutils/auth_service_test.go
@@ -10,9 +10,10 @@ import (
 
 func TestCompareWithLatestBlockNumber(t *testing.T) {
 	config.Vip().Set(config.EthereumJsonRpcEndpointKey, "https://ropsten.infura.io")
+	config.Validate()
 	currentBlockNum, _ := CurrentBlock()
 	err := CompareWithLatestBlockNumber(currentBlockNum.Add(currentBlockNum, big.NewInt(13)))
-	assert.Equal(t, err.Error(), "difference between the latest block chain number and the block number passed is 13 ")
+	assert.Equal(t, err.Error(), "authentication failed as the signature passed has expired")
 
 	currentBlockNum, _ = CurrentBlock()
 	err = CompareWithLatestBlockNumber(currentBlockNum.Add(currentBlockNum, big.NewInt(1)))