diff --git a/CHANGELOG.md b/CHANGELOG.md
index 95466c0..6b67530 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 #### v5.x
 
-- Add more crypto utils
+- Add more crypto/codec utils
 - Remove features related to `no_std` and `wasm32`
 
 #### v4.x
diff --git a/Cargo.toml b/Cargo.toml
index 118be94..5a8adfe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ruc"
-version = "5.0.13"
+version = "5.1.0"
 authors = ["rust-util-collections", "hui.fan@mail.ru"]
 edition = "2021"
 description = "Rust Util Collections"
@@ -21,6 +21,7 @@ ed25519-zebra = { version = "4.0.0", optional = true }
 reference-trie = { version = "0.29.0", optional = true }
 rand = { version = "0.8", optional = true }
 base64 = {version = "0.21.2", optional = true }
+hex = {version = "0.4.3", optional = true }
 
 nix = { version = "0.26", optional = true }
 time = { version = "0.3", features = ["formatting"] }
@@ -36,7 +37,7 @@ compact = []
 uau = ["nix","rand"]
 cmd = []
 ssh = ["ssh2"]
-crypto = ["reference-trie", "sha3", "ed25519-zebra", "rand", "base64"]
+crypto = ["reference-trie", "sha3", "ed25519-zebra", "rand", "base64", "hex"]
 SerDe = ["serde"]
 
 full = ["uau", "cmd", "ssh", "crypto", "SerDe"]
diff --git a/src/crypto/codec/base64/mod.rs b/src/crypto/codec/base64.rs
similarity index 100%
rename from src/crypto/codec/base64/mod.rs
rename to src/crypto/codec/base64.rs
diff --git a/src/crypto/codec/hex.rs b/src/crypto/codec/hex.rs
new file mode 100644
index 0000000..111b65d
--- /dev/null
+++ b/src/crypto/codec/hex.rs
@@ -0,0 +1,29 @@
+use crate::*;
+
+#[inline(always)]
+pub fn encode<T: AsRef<[u8]>>(orig: T) -> String {
+    hex::encode(orig)
+}
+
+#[inline(always)]
+pub fn decode(encoded: &str) -> Result<Vec<u8>> {
+    decode_generic(encoded).c(d!())
+}
+
+#[inline(always)]
+pub fn decode_generic<T: AsRef<[u8]>>(encoded: T) -> Result<Vec<u8>> {
+    hex::decode(encoded).c(d!())
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn ende() {
+        let msg = "alajflajfljaljflajfaljlaksjr22142";
+        let encoded = encode(msg);
+        let decoded = decode(&encoded).unwrap();
+        assert_eq!(decoded.as_slice(), msg.as_bytes());
+    }
+}
diff --git a/src/crypto/codec/mod.rs b/src/crypto/codec/mod.rs
index 39abdce..20c5369 100644
--- a/src/crypto/codec/mod.rs
+++ b/src/crypto/codec/mod.rs
@@ -1 +1,2 @@
 pub mod base64;
+pub mod hex;