diff --git a/cli/README.md b/cli/README.md
new file mode 100644
index 0000000..7d6b35e
--- /dev/null
+++ b/cli/README.md
@@ -0,0 +1,5 @@
+# CLI
+Work in progress
+
+# 2. Install Go
+If you don't have Go installed, download it from <a href="https://go.dev/dl/">here</a> or install it from your package manager (`apt install golang-go`). The latest version of Go is recommended, although you may fall back to Go 1.19 should any issues arise in the future.
\ No newline at end of file
diff --git a/cli/picocrypt/go.mod b/cli/picocrypt/go.mod
new file mode 100644
index 0000000..653f501
--- /dev/null
+++ b/cli/picocrypt/go.mod
@@ -0,0 +1,10 @@
+module github.com/HACKERALERT/Picocrypt/cli/picocrypt
+
+go 1.17
+
+require (
+	github.com/HACKERALERT/crypto v0.0.0-20220905152506-aa0dd62d8f67
+	github.com/HACKERALERT/infectious v0.0.0-20220905152109-2c37b99f37ff
+)
+
+require github.com/HACKERALERT/sys v0.0.0-20220905150735-46e319fb60c9 // indirect
diff --git a/cli/picocrypt/go.sum b/cli/picocrypt/go.sum
new file mode 100644
index 0000000..241eb57
--- /dev/null
+++ b/cli/picocrypt/go.sum
@@ -0,0 +1,6 @@
+github.com/HACKERALERT/crypto v0.0.0-20220905152506-aa0dd62d8f67 h1:4WfPIopYjvBjyDg0IET7mEj32kkihLmvFgwCOmldqK8=
+github.com/HACKERALERT/crypto v0.0.0-20220905152506-aa0dd62d8f67/go.mod h1:qiHCxMDsCxX4QhXd3kDYWiNOR/DZQZ7nYO/f2OgWst0=
+github.com/HACKERALERT/infectious v0.0.0-20220905152109-2c37b99f37ff h1:ertDhqhixxQJJPJIpn4wmSVs2fQ3tlSDNuiZ7jHCvEs=
+github.com/HACKERALERT/infectious v0.0.0-20220905152109-2c37b99f37ff/go.mod h1:GwBVHbiXRUUciGfKWwm4GCL8FvMZBLHrQq23UXW/CU8=
+github.com/HACKERALERT/sys v0.0.0-20220905150735-46e319fb60c9 h1:raqLJhvqDGk9L4dnJnO0tTV5Lyba2jhQcIHEle+o1dM=
+github.com/HACKERALERT/sys v0.0.0-20220905150735-46e319fb60c9/go.mod h1:I4esFWbCYc37CXVb+3qJHJiU43NGkLf66kNV/NDnXcU=
diff --git a/cli/picocrypt/main.go b/cli/picocrypt/main.go
new file mode 100644
index 0000000..ffb25fa
--- /dev/null
+++ b/cli/picocrypt/main.go
@@ -0,0 +1,229 @@
+package main
+
+import (
+	"bytes"
+	"crypto/rand"
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/HACKERALERT/crypto/argon2"
+	"github.com/HACKERALERT/crypto/blake2b"
+	"github.com/HACKERALERT/crypto/chacha20"
+	"github.com/HACKERALERT/crypto/hkdf"
+	"github.com/HACKERALERT/crypto/sha3"
+	"github.com/HACKERALERT/infectious"
+)
+
+var MiB = 1 << 20
+var GiB = 1 << 30
+var rs5, _ = infectious.NewFEC(5, 15)
+var rs16, _ = infectious.NewFEC(16, 48)
+var rs24, _ = infectious.NewFEC(24, 72)
+var rs32, _ = infectious.NewFEC(32, 96)
+var rs64, _ = infectious.NewFEC(64, 192)
+
+func work(filename string, password string) int {
+	var salt []byte
+	var hkdfSalt []byte
+	var nonce []byte
+	var keyHash []byte
+	var keyHashRef []byte
+	var authTag []byte
+
+	fin, err := os.Open(filename)
+	if err != nil {
+		fmt.Println("Couldn't open input file.")
+		return 1
+	}
+	defer fin.Close()
+
+	var fout *os.File
+	if strings.HasSuffix(filename, ".pcv") {
+		fout, err = os.Create(strings.TrimSuffix(filename, ".pcv"))
+	} else {
+		fout, err = os.Create(filename + ".pcv")
+	}
+	if err != nil {
+		fmt.Println("Couldn't create output file.")
+		return 1
+	}
+	defer fout.Close()
+
+	if !strings.HasSuffix(filename, ".pcv") {
+		salt = make([]byte, 16)
+		hkdfSalt = make([]byte, 32)
+		nonce = make([]byte, 24)
+		rand.Read(salt)
+		rand.Read(hkdfSalt)
+		rand.Read(nonce)
+		fout.Write(rsEncode(rs5, []byte("v1.32")))
+		fout.Write(rsEncode(rs5, []byte("00000")))
+		fout.Write(rsEncode(rs5, make([]byte, 5)))
+		fout.Write(rsEncode(rs16, salt))
+		fout.Write(rsEncode(rs32, hkdfSalt))
+		fout.Write(rsEncode(rs16, make([]byte, 16)))
+		fout.Write(rsEncode(rs24, nonce))
+		fout.Write(make([]byte, 480))
+	} else {
+		errs := make([]error, 7)
+		comments := make([]byte, 30)
+		fin.Read(comments)
+		comments, errs[0] = rsDecode(rs5, comments[15:])
+		length, _ := strconv.Atoi(string(comments))
+		fin.Read(make([]byte, length*3))
+		flags := make([]byte, 15)
+		fin.Read(flags)
+		flags, errs[1] = rsDecode(rs5, flags)
+		salt = make([]byte, 48)
+		fin.Read(salt)
+		salt, errs[2] = rsDecode(rs16, salt)
+		hkdfSalt = make([]byte, 96)
+		fin.Read(hkdfSalt)
+		hkdfSalt, errs[3] = rsDecode(rs32, hkdfSalt)
+		fin.Read(make([]byte, 48))
+		nonce = make([]byte, 72)
+		fin.Read(nonce)
+		nonce, errs[4] = rsDecode(rs24, nonce)
+		keyHashRef = make([]byte, 192)
+		fin.Read(keyHashRef)
+		keyHashRef, errs[5] = rsDecode(rs64, keyHashRef)
+		fin.Read(make([]byte, 96))
+		authTag = make([]byte, 192)
+		fin.Read(authTag)
+		authTag, errs[6] = rsDecode(rs64, authTag)
+		for _, err := range errs {
+			if err != nil {
+				fmt.Println("The header is corrupted.")
+				return 1
+			}
+		}
+		if flags[0]+flags[1]+flags[3] > 0 {
+			fmt.Println("Unsupported volume.")
+			return 1
+		}
+	}
+
+	key := argon2.IDKey([]byte(password), salt, 4, 1<<20, 4, 32)
+	tmp := sha3.New512()
+	tmp.Write(key)
+	keyHash = tmp.Sum(nil)
+	if strings.HasSuffix(filename, ".pcv") && !bytes.Equal(keyHash, keyHashRef) {
+		fmt.Println("Incorrect password.")
+		return 1
+	}
+
+	counter := 0
+	chacha, _ := chacha20.NewUnauthenticatedCipher(key, nonce)
+	subkey := make([]byte, 32)
+	hkdf := hkdf.New(sha3.New256, key, hkdfSalt, nil)
+	hkdf.Read(subkey)
+	mac, _ := blake2b.New512(subkey)
+	hkdf.Read(make([]byte, 32))
+
+	for {
+		src := make([]byte, MiB)
+		size, err := fin.Read(src)
+		if err != nil {
+			break
+		}
+		src = src[:size]
+		dst := make([]byte, len(src))
+
+		if !strings.HasSuffix(filename, ".pcv") {
+			chacha.XORKeyStream(dst, src)
+			mac.Write(dst)
+		} else {
+			mac.Write(src)
+			chacha.XORKeyStream(dst, src)
+		}
+		fout.Write(dst)
+
+		counter += MiB
+		if counter >= 60*GiB {
+			nonce = make([]byte, 24)
+			hkdf.Read(nonce)
+			chacha, _ = chacha20.NewUnauthenticatedCipher(key, nonce)
+			hkdf.Read(make([]byte, 16))
+			counter = 0
+		}
+	}
+
+	if !strings.HasSuffix(filename, ".pcv") {
+		fout.Seek(309, 0)
+		fout.Write(rsEncode(rs64, keyHash))
+		fout.Write(rsEncode(rs32, make([]byte, 32)))
+		fout.Write(rsEncode(rs64, mac.Sum(nil)))
+	} else {
+		if !bytes.Equal(mac.Sum(nil), authTag) {
+			fmt.Println("The file has been modified.")
+			return 1
+		}
+	}
+
+	fmt.Println("Operation successful.")
+	return 0
+}
+
+func rsEncode(rs *infectious.FEC, data []byte) []byte {
+	res := make([]byte, rs.Total())
+	rs.Encode(data, func(s infectious.Share) {
+		res[s.Number] = s.Data[0]
+	})
+	return res
+}
+
+func rsDecode(rs *infectious.FEC, data []byte) ([]byte, error) {
+	tmp := make([]infectious.Share, rs.Total())
+	for i := 0; i < rs.Total(); i++ {
+		tmp[i].Number = i
+		tmp[i].Data = []byte{data[i]}
+	}
+	res, err := rs.Decode(nil, tmp)
+	if err != nil {
+		return data[:rs.Total()/3], err
+	}
+	return res, nil
+}
+
+func main() {
+	flag.Usage = func() { fmt.Println("Usage: picocrypt -p password <file>") }
+	password := flag.String("p", "", "")
+	flag.Parse()
+	filename := flag.Arg(0)
+
+	if filename == "" || *password == "" || flag.Arg(1) != "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+	if _, err := os.Stat(filename); err != nil {
+		fmt.Println("Input file not found.")
+		os.Exit(1)
+	}
+	if stat, _ := os.Stat(filename); stat.IsDir() {
+		fmt.Println("Directories are not supported.")
+		os.Exit(1)
+	}
+	if !strings.HasSuffix(filename, ".pcv") {
+		if _, err := os.Stat(filename + ".pcv"); err == nil {
+			fmt.Println("Output already exists.")
+			os.Exit(1)
+		}
+	} else {
+		if _, err := os.Stat(strings.TrimSuffix(filename, ".pcv")); err == nil {
+			fmt.Println("Output already exists.")
+			os.Exit(1)
+		}
+	}
+
+	if work(filename, *password) != 0 {
+		if !strings.HasSuffix(filename, ".pcv") {
+			os.Remove(filename + ".pcv")
+		} else {
+			os.Remove(strings.TrimSuffix(filename, ".pcv"))
+		}
+		os.Exit(1)
+	}
+}