diff --git a/auth.go b/auth.go
index ec049c1..3783a2e 100644
--- a/auth.go
+++ b/auth.go
@@ -12,8 +12,8 @@ import (
 	"github.com/dgrijalva/jwt-go"
 )
 
-var appName = "webutility"
-var secret = "webutility"
+var _issuer = "webutility"
+var _secret = "webutility"
 
 // TokenClaims are JWT token claims.
 type TokenClaims struct {
@@ -29,9 +29,9 @@ type TokenClaims struct {
 	ExpiresIn int64  `json:"expires_in"`
 }
 
-func InitJWT(appName, secret string) {
-	appName = appName
-	secret = secret
+func InitJWT(issuer, secret string) {
+	_issuer = issuer
+	_secret = secret
 }
 
 // ValidateHash hashes pass and salt and returns comparison result with resultHash
@@ -93,10 +93,10 @@ func CreateAuthToken(username string, roleName string, roleID int64) (TokenClaim
 	// initialize jwt.StandardClaims fields (anonymous struct)
 	claims.IssuedAt = t0
 	claims.ExpiresAt = t1
-	claims.Issuer = appName
+	claims.Issuer = _issuer
 
 	jwtToken := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
-	token, err := jwtToken.SignedString([]byte(secret))
+	token, err := jwtToken.SignedString([]byte(_secret))
 	if err != nil {
 		return TokenClaims{}, err
 	}
@@ -204,5 +204,5 @@ func randomSalt() (s string, err error) {
 
 // secretFunc returns byte slice of API secret keyword.
 func secretFunc(token *jwt.Token) (interface{}, error) {
-	return []byte(secret), nil
+	return []byte(_secret), nil
 }