diff --git a/go.mod b/go.mod
index 95beac76..f7f56a33 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/schollz/croc/v6
 
-go 1.12
+go 1.13
 
 require (
 	github.com/OneOfOne/xxhash v1.2.5 // indirect
@@ -20,9 +20,9 @@ require (
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/stretchr/testify v1.4.0
 	github.com/urfave/cli v1.21.0
-	golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472
+	golang.org/x/crypto v0.0.0-20190907121410-71b5226ff739
 	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 // indirect
-	golang.org/x/sys v0.0.0-20190904005037-43c01164e931 // indirect
+	golang.org/x/sys v0.0.0-20190904154756-749cb33beabd // indirect
 	golang.org/x/text v0.3.2 // indirect
 	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )
diff --git a/go.sum b/go.sum
index 0280c454..d2d8b370 100644
--- a/go.sum
+++ b/go.sum
@@ -57,8 +57,8 @@ github.com/urfave/cli v1.21.0/go.mod h1:lxDj6qX9Q6lWQxIrbrT0nwecwUtRnhVZAJjJZrVU
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472 h1:Gv7RPwsi3eZ2Fgewe3CBsuOebPwO27PoXzRpJPsvSSM=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190907121410-71b5226ff739 h1:Gc7JIyxvWgD6m+QmVryY0MstDORNYididDGxgZ6Tnpk=
+golang.org/x/crypto v0.0.0-20190907121410-71b5226ff739/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -71,8 +71,8 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190904005037-43c01164e931 h1:+WYfosiOJzB4BjsISl1Rv4ZLUy+VYcF+u+0Y9jcerv8=
-golang.org/x/sys v0.0.0-20190904005037-43c01164e931/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd h1:DBH9mDw0zluJT/R+nGuV3jWFWLFaHyYZWD4tOT+cjn0=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
diff --git a/src/croc/croc.go b/src/croc/croc.go
index 957d2205..806c2cae 100644
--- a/src/croc/croc.go
+++ b/src/croc/croc.go
@@ -90,8 +90,10 @@ type Client struct {
 	spinner   *spinner.Spinner
 	firstSend bool
 
-	mutex *sync.Mutex
-	quit  chan bool
+	mutex       *sync.Mutex
+	fread       *os.File
+	numfinished int
+	quit        chan bool
 }
 
 type Chunk struct {
@@ -843,6 +845,16 @@ func (c *Client) updateState() (err error) {
 		c.setBar()
 		c.TotalSent = 0
 		log.Debug("beginning sending comms")
+		pathToFile := path.Join(
+			c.FilesToTransfer[c.FilesToTransferCurrentNum].FolderSource,
+			c.FilesToTransfer[c.FilesToTransferCurrentNum].Name,
+		)
+
+		c.fread, err = os.Open(pathToFile)
+		c.numfinished = 0
+		if err != nil {
+			return
+		}
 		for i := 0; i < len(c.Options.RelayPorts); i++ {
 			log.Debugf("starting sending over comm %d", i)
 			go c.sendData(i)
@@ -881,6 +893,7 @@ func (c *Client) setBar() {
 }
 
 func (c *Client) receiveData(i int) {
+	log.Debugf("%d receiving data", i)
 	for {
 		data, err := c.conn[i+1].Receive()
 		if err != nil {
@@ -938,30 +951,23 @@ func (c *Client) receiveData(i int) {
 func (c *Client) sendData(i int) {
 	defer func() {
 		log.Debugf("finished with %d", i)
+		c.numfinished++
+		if c.numfinished == len(c.Options.RelayPorts) {
+			log.Debug("closing file")
+			c.fread.Close()
+		}
 	}()
-	pathToFile := path.Join(
-		c.FilesToTransfer[c.FilesToTransferCurrentNum].FolderSource,
-		c.FilesToTransfer[c.FilesToTransferCurrentNum].Name,
-	)
-	log.Debugf("opening %s to read", pathToFile)
-	f, err := os.Open(pathToFile)
-	if err != nil {
-		panic(err)
-	}
-	defer f.Close()
 
+	var readingPos int64
 	pos := uint64(0)
 	curi := float64(0)
 	for {
 		// Read file
 		data := make([]byte, models.TCP_BUFFER_SIZE/2)
-		n, err := f.Read(data)
-		if err != nil {
-			if err == io.EOF {
-				break
-			}
-			panic(err)
-		}
+		// log.Debugf("%d trying to read", i)
+		n, errRead := c.fread.ReadAt(data, readingPos)
+		// log.Debugf("%d read %d bytes", i, n)
+		readingPos += int64(n)
 
 		if math.Mod(curi, float64(len(c.Options.RelayPorts))) == float64(i) {
 			// check to see if this is a chunk that the recipient wants
@@ -1003,8 +1009,13 @@ func (c *Client) sendData(i int) {
 
 		curi++
 		pos += uint64(n)
-	}
 
-	time.Sleep(10 * time.Second)
+		if errRead != nil {
+			if errRead == io.EOF {
+				break
+			}
+			panic(errRead)
+		}
+	}
 	return
 }
diff --git a/src/croc/croc_test.go b/src/croc/croc_test.go
index 51563a6a..b66d9974 100644
--- a/src/croc/croc_test.go
+++ b/src/croc/croc_test.go
@@ -11,6 +11,7 @@ import (
 )
 
 func TestCroc(t *testing.T) {
+	log.SetLevel("trace")
 	defer os.Remove("README.md")
 	go tcp.Run("debug", "8081", "8082,8083,8084,8085")
 	go tcp.Run("debug", "8082")