diff --git a/src/mgm.rs b/src/mgm.rs
index 0bb2da7..f2a9a4f 100644
--- a/src/mgm.rs
+++ b/src/mgm.rs
@@ -108,7 +108,7 @@ pub trait MgmKeyAlgorithm:
     }
 }
 
-impl MgmKeyAlgorithm for des::TdesEee3 {
+impl MgmKeyAlgorithm for des::TdesEde3 {
     const KEY_SIZE: u8 = 24;
     const ALGORITHM_ID: u8 = 0x03;
 
@@ -208,7 +208,7 @@ pub struct MgmKey<C: MgmKeyAlgorithm> {
 }
 
 /// A Management Key (MGM) using Triple-DES
-pub type MgmKey3Des = MgmKey<des::TdesEee3>;
+pub type MgmKey3Des = MgmKey<des::TdesEde3>;
 
 /// A Management Key (MGM) using AES-128
 pub type MgmKeyAes128 = MgmKey<aes::Aes128>;
@@ -522,7 +522,7 @@ impl<'a, C: MgmKeyAlgorithm> TryFrom<&'a [u8]> for MgmKey<C> {
 // Seal the MgmKeyAlgorithm trait
 mod private {
     pub trait Seal {}
-    impl Seal for des::TdesEee3 {}
+    impl Seal for des::TdesEde3 {}
     impl Seal for aes::Aes128 {}
     impl Seal for aes::Aes192 {}
     impl Seal for aes::Aes256 {}
diff --git a/src/yubikey.rs b/src/yubikey.rs
index 8956d42..27f62dc 100644
--- a/src/yubikey.rs
+++ b/src/yubikey.rs
@@ -363,7 +363,7 @@ impl YubiKey {
             .data([TAG_DYN_AUTH, 0x02, 0x80, 0x00])
             .transmit(&txn, 261)?;
 
-        if !card_response.is_success() {
+        if !card_response.is_success() || card_response.data().len() < 5 {
             return Err(Error::AuthenticationError);
         }