diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1eb04e0
--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+### Link to the original source: [Advanced encryption and decryption](https://astaxie.gitbooks.io/build-web-application-with-golang/content/en/09.6.html)
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..b8d04e2
--- /dev/null
+++ b/main.go
@@ -0,0 +1,70 @@
+package aes
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"errors"
+	"io"
+	mrand "math/rand"
+	"time"
+)
+
+const (
+	keySize      = 32
+	allowedRunes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+)
+
+// RandomKey returns a randomly generated 32 bytes long hex encoded key.
+func RandomKey() (key []byte) {
+	mrand.Seed(time.Now().UnixNano())
+
+	key = make([]byte, keySize)
+
+	for i := range key {
+		key[i] = allowedRunes[mrand.Intn(len(allowedRunes))]
+	}
+
+	return key
+}
+
+// Encrypt encrypts plaintext with key and returns resulting bytes.
+func Encrypt(plaintext []byte, key []byte) ([]byte, error) {
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+		return nil, err
+	}
+
+	return gcm.Seal(nonce, nonce, plaintext, nil), nil
+}
+
+// Decrypt decrypts ciphertext with key and returns resulting bytes.
+func Decrypt(ciphertext []byte, key []byte) ([]byte, error) {
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return nil, err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return nil, errors.New("ciphertext too short")
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	return gcm.Open(nil, nonce, ciphertext, nil)
+}