diff --git a/randstring.go b/randstring.go
deleted file mode 100644
index 2d7096f..0000000
--- a/randstring.go
+++ /dev/null
@@ -1,48 +0,0 @@
-// thermal-uploader - upload thermal video recordings in CPTV format to the project's API server.
-//  Copyright (C) 2017, The Cacophony Project
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program. If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"math/rand"
-	"time"
-)
-
-const (
-	chars       = "abcdefghijklmnopqrstuvwxyz0123456789"
-	charIdxBits = 6                  // 6 bits to represent a char index
-	charIdxMax  = 63 / charIdxBits   // # of char indices fitting in 63 bits
-	charIdxMask = 1<<charIdxBits - 1 // All 1-bits, as many as charIdxBits
-)
-
-var randSrc = rand.NewSource(time.Now().UnixNano())
-
-func randString(n int) string {
-	b := make([]byte, n)
-	// A randSrc.Int63() generates 63 random bits, enough for charIdxMax characters!
-	for i, cache, remain := n-1, randSrc.Int63(), charIdxMax; i >= 0; {
-		if remain == 0 {
-			cache, remain = randSrc.Int63(), charIdxMax
-		}
-		if idx := int(cache & charIdxMask); idx < len(chars) {
-			b[i] = chars[idx]
-			i--
-		}
-		cache >>= charIdxBits
-		remain--
-	}
-	return string(b)
-}