diff --git a/elasticsearch/elasticsearch.go b/elasticsearch/elasticsearch.go
index 60241c9..71a3e28 100644
--- a/elasticsearch/elasticsearch.go
+++ b/elasticsearch/elasticsearch.go
@@ -20,7 +20,7 @@ func (m *ElasticSearchMatcher) Key() string {
 func (m *ElasticSearchMatcher) Name(matchCtx *osm.MatchCtx) string {
 	name := "ElasticSearch"
 	if v, ok := matchCtx.GetAttribute("number"); ok {
-		name = name + " (" + v.(string) + ")"
+		name = name + " (" + v + ")"
 	}
 	return name
 }
diff --git a/http/http.go b/http/http.go
index a4c97c8..00df303 100644
--- a/http/http.go
+++ b/http/http.go
@@ -17,7 +17,7 @@ func (m *HTTPMatcher) Key() string {
 func (m *HTTPMatcher) Name(matchCtx *osm.MatchCtx) string {
 	name := "HTTP"
 	if v, ok := matchCtx.GetAttribute("server"); ok {
-		name = name + " (" + v.(string) + ")"
+		name = name + " (" + v + ")"
 	}
 	return name
 }
diff --git a/matcher.go b/matcher.go
index aa3dae7..7ac978f 100644
--- a/matcher.go
+++ b/matcher.go
@@ -42,7 +42,7 @@ func (m *Matchers) AddPacket(packet *Packet) {
 type MatchCtx struct {
 	address    string
 	port       int
-	attributes map[string]interface{}
+	attributes map[string]string
 }
 
 func (mc *MatchCtx) Address() string {
@@ -53,25 +53,25 @@ func (mc *MatchCtx) Port() int {
 	return mc.port
 }
 
-func (mc *MatchCtx) GetAttribute(key string) (value interface{}, ok bool) {
+func (mc *MatchCtx) GetAttribute(key string) (value string, ok bool) {
 	value, ok = mc.attributes[key]
 
 	return
 }
 
-func (mc *MatchCtx) SetAttribute(key string, value interface{}) {
+func (mc *MatchCtx) SetAttribute(key string, value string) {
 	mc.attributes[key] = value
 }
 
 func (mc *MatchCtx) InitAttribute() {
-	mc.attributes = make(map[string]interface{})
+	mc.attributes = make(map[string]string)
 }
 
 func NewMatchCtx(address string, port int) *MatchCtx {
 	return &MatchCtx{
 		address:    address,
 		port:       port,
-		attributes: make(map[string]interface{}),
+		attributes: make(map[string]string),
 	}
 }
 
diff --git a/mysql/mysql.go b/mysql/mysql.go
index 4fdebf2..44227de 100644
--- a/mysql/mysql.go
+++ b/mysql/mysql.go
@@ -20,10 +20,10 @@ func (m *MySqlMatcher) Key() string {
 func (m *MySqlMatcher) Name(matchCtx *osm.MatchCtx) string {
 	name := "MySQL"
 	if v, ok := matchCtx.GetAttribute("version"); ok {
-		if strings.Contains(v.(string), "MariaDB") {
+		if strings.Contains(v, "MariaDB") {
 			name = "MariaDB"
 		}
-		name = name + " (" + v.(string) + ")"
+		name = name + " (" + v + ")"
 	}
 	return name
 }
diff --git a/redis/redis.go b/redis/redis.go
index 4719c65..98db016 100644
--- a/redis/redis.go
+++ b/redis/redis.go
@@ -2,6 +2,7 @@ package redis
 
 import (
 	"bufio"
+	"strconv"
 	"strings"
 
 	osm "git.loafle.net/overflow/service_matcher-go"
@@ -23,16 +24,16 @@ func (m *RedisMatcher) Name(matchCtx *osm.MatchCtx) string {
 	name := "Redis"
 
 	if v, ok := matchCtx.GetAttribute("protected"); ok {
-		if v.(bool) {
+		if _v, _err := strconv.ParseBool(v); nil != _err && _v {
 			return name + " (protected)"
 		}
 	}
 
 	if v, ok := matchCtx.GetAttribute("redis_mode"); ok {
-		name = name + " " + v.(string)
+		name = name + " " + v
 	}
 	if v, ok := matchCtx.GetAttribute("redis_version"); ok {
-		name = name + " (" + v.(string) + ")"
+		name = name + " (" + v + ")"
 	}
 	return name
 }
@@ -80,7 +81,7 @@ func (m *RedisMatcher) Match(matchCtx *osm.MatchCtx, index int, packet *osm.Pack
 
 		protected := m.checkProtectedMode(packet)
 
-		matchCtx.SetAttribute("protected", protected)
+		matchCtx.SetAttribute("protected", strconv.FormatBool(protected))
 		if protected {
 			return nil
 		}
@@ -89,10 +90,11 @@ func (m *RedisMatcher) Match(matchCtx *osm.MatchCtx, index int, packet *osm.Pack
 		response := string(packet.Bytes())
 
 		if v, ok := matchCtx.GetAttribute("protected"); ok {
-			if !v.(bool) {
+			if _v, _err := strconv.ParseBool(v); nil != _err && _v {
 				m.parseResponse(matchCtx, response)
 			}
 		}
+
 		return nil
 	case 2:
 		sign := string([]rune(resp)[0])
@@ -151,7 +153,7 @@ func (m *RedisMatcher) parseResponse(matchCtx *osm.MatchCtx, response string) {
 
 func (m *RedisMatcher) PacketCount(matchCtx *osm.MatchCtx) int {
 	if v, ok := matchCtx.GetAttribute("protected"); ok {
-		if v.(bool) {
+		if _v, _err := strconv.ParseBool(v); nil != _err && _v {
 			return 1
 		}
 	}
diff --git a/sqlserver/sqlserver.go b/sqlserver/sqlserver.go
index 7a98439..5dd2dda 100644
--- a/sqlserver/sqlserver.go
+++ b/sqlserver/sqlserver.go
@@ -3,6 +3,7 @@ package sqlserver
 import (
 	"bytes"
 	"encoding/binary"
+	"strconv"
 
 	osm "git.loafle.net/overflow/service_matcher-go"
 )
@@ -118,12 +119,12 @@ func (m *SQLServerMatcher) Match(matchCtx *osm.MatchCtx, index int, packet *osm.
 	case 0:
 		return nil
 	case 1:
-		matchCtx.SetAttribute("isSSL", true)
+		matchCtx.SetAttribute("isSSL", strconv.FormatBool(true))
 		return nil
 	case 2:
 		return nil
 	case 3:
-		matchCtx.SetAttribute("isSSL", true)
+		matchCtx.SetAttribute("isSSL", strconv.FormatBool(true))
 		return nil
 	default:
 		return osm.NotMatchedError()
diff --git a/ssh/ssh.go b/ssh/ssh.go
index a8e66f0..99bdf94 100644
--- a/ssh/ssh.go
+++ b/ssh/ssh.go
@@ -19,7 +19,7 @@ func (m *SSHMatcher) Key() string {
 func (m *SSHMatcher) Name(matchCtx *osm.MatchCtx) string {
 	name := "SSH"
 	if v, ok := matchCtx.GetAttribute("softwareversion"); ok {
-		name = name + " (" + v.(string) + ")"
+		name = name + " (" + v + ")"
 	}
 	return name
 }