diff --git a/cmd/cmd-verify.go b/cmd/cmd-verify.go
index 1efc832..061dcf6 100644
--- a/cmd/cmd-verify.go
+++ b/cmd/cmd-verify.go
@@ -83,7 +83,7 @@ var verifyCmd = &cobra.Command{
 					}
 
 					// Only verify if .sig or .letter.
-					if strings.HasSuffix(path, sigFileExtension) ||
+					if strings.HasSuffix(path, filesig.Extension) ||
 						strings.HasSuffix(path, letterFileExtension) {
 						if err := verify(path, true); err != nil {
 							verificationFails++
@@ -135,11 +135,11 @@ func verify(filename string, bulkMode bool) error {
 		signedBy, err = verifyLetter(filename, bulkMode)
 	case strings.HasSuffix(filename, letterFileExtension):
 		signedBy, err = verifyLetter(filename, bulkMode)
-	case strings.HasSuffix(filename, sigFileExtension):
-		filename = strings.TrimSuffix(filename, sigFileExtension)
+	case strings.HasSuffix(filename, filesig.Extension):
+		filename = strings.TrimSuffix(filename, filesig.Extension)
 		fallthrough
 	default:
-		signame = filename + sigFileExtension
+		signame = filename + filesig.Extension
 		signedBy, err = verifySig(filename, signame, bulkMode)
 	}
 
diff --git a/cmd/main.go b/cmd/main.go
index d7f97f1..b603063 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -53,7 +53,7 @@ func main() {
 	rootCmd.PersistentFlags().StringVarP(&trustStoreDir, "tsdir", "d", "",
 		"specify a truststore directory (default loaded from JESS_TS_DIR env variable)",
 	)
-	rootCmd.PersistentFlags().StringVarP(&trustStoreDir, "tskeyring", "k", "",
+	rootCmd.PersistentFlags().StringVarP(&trustStoreKeyring, "tskeyring", "r", "",
 		"specify a truststore keyring namespace (default loaded from JESS_TS_KEYRING env variable) - lower priority than tsdir",
 	)
 	rootCmd.PersistentFlags().StringVarP(&noSpec, "no", "n", "",
diff --git a/envelope.go b/envelope.go
index 2935041..71c2aa8 100644
--- a/envelope.go
+++ b/envelope.go
@@ -285,14 +285,14 @@ func (e *Envelope) CleanSignets() {
 		}
 	}
 	for i, signet := range e.Senders {
-		e.Secrets[i] = &Signet{
+		e.Senders[i] = &Signet{
 			Version: signet.Version,
 			ID:      signet.ID,
 			Scheme:  signet.Scheme,
 		}
 	}
 	for i, signet := range e.Recipients {
-		e.Secrets[i] = &Signet{
+		e.Recipients[i] = &Signet{
 			Version: signet.Version,
 			ID:      signet.ID,
 			Scheme:  signet.Scheme,
diff --git a/filesig/main.go b/filesig/main.go
index b4f54ba..b71ad87 100644
--- a/filesig/main.go
+++ b/filesig/main.go
@@ -9,6 +9,9 @@ import (
 	"github.com/safing/portbase/formats/dsd"
 )
 
+// Extension holds the default file extension to be used for signature files.
+const Extension = ".sig"
+
 var fileSigRequirements = jess.NewRequirements().
 	Remove(jess.RecipientAuthentication).
 	Remove(jess.Confidentiality)
diff --git a/import_export.go b/import_export.go
index 347d5c2..86de909 100644
--- a/import_export.go
+++ b/import_export.go
@@ -182,11 +182,13 @@ func EnvelopeFromTextFormat(textFormat string) (*Envelope, error) {
 	return EnvelopeFromBase58(splitted[len(splitted)-1])
 }
 
-var replaceForTextFormatMatcher = regexp.MustCompile(`[^A-Za-z\-]+`)
+var replaceForTextFormatMatcher = regexp.MustCompile(`[^A-Za-z0-9]+`)
 
 // toTextFormatString makes a string compatible with the text format.
 func toTextFormatString(s string) string {
 	return strings.ToLower(
-		replaceForTextFormatMatcher.ReplaceAllString(s, "_"),
+		strings.Trim(
+			replaceForTextFormatMatcher.ReplaceAllString(s, "-"), "-",
+		),
 	)
 }