diff --git a/nssa/core/src/account/commitment.rs b/nssa/core/src/account/commitment.rs
index b9d9abf..9a3fc20 100644
--- a/nssa/core/src/account/commitment.rs
+++ b/nssa/core/src/account/commitment.rs
@@ -12,7 +12,7 @@ pub struct Commitment(pub(super) [u8; 32]);
 impl Commitment {
     pub fn new(Npk: &NullifierPublicKey, account: &Account) -> Self {
         let mut bytes = Vec::new();
-        bytes.extend_from_slice(&Npk.to_bytes());
+        bytes.extend_from_slice(&Npk.to_byte_array());
         bytes.extend_from_slice(&account.to_bytes());
         Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
     }
diff --git a/nssa/core/src/account/encoding.rs b/nssa/core/src/account/encoding.rs
index 982cdee..91737b6 100644
--- a/nssa/core/src/account/encoding.rs
+++ b/nssa/core/src/account/encoding.rs
@@ -20,14 +20,14 @@ impl Account {
 }
 
 impl Commitment {
-    pub(crate) fn to_bytes(&self) -> [u8; 32] {
+    pub(crate) fn to_byte_array(&self) -> [u8; 32] {
         self.0
     }
 }
 
 
 impl NullifierPublicKey {
-    pub(crate) fn to_bytes(&self) -> [u8; 32] {
+    pub(crate) fn to_byte_array(&self) -> [u8; 32] {
         self.0
     }
 }
diff --git a/nssa/core/src/account/nullifier.rs b/nssa/core/src/account/nullifier.rs
index 8df2a3e..13f81db 100644
--- a/nssa/core/src/account/nullifier.rs
+++ b/nssa/core/src/account/nullifier.rs
@@ -7,8 +7,16 @@ use crate::account::Commitment;
 pub struct NullifierPublicKey(pub(super) [u8; 32]);
 
 impl From<&NullifierSecretKey> for NullifierPublicKey {
-    fn from(_value: &NullifierSecretKey) -> Self {
-        todo!()
+    fn from(value: &NullifierSecretKey) -> Self {
+        let mut bytes = Vec::new();
+        const PREFIX: &[u8; 9] = b"NSSA_keys";
+        const SUFFIX_1: &[u8; 1] = &[7];
+        const SUFFIX_2: &[u8; 22] = &[0; 22];
+        bytes.extend_from_slice(PREFIX);
+        bytes.extend_from_slice(value);
+        bytes.extend_from_slice(SUFFIX_1);
+        bytes.extend_from_slice(SUFFIX_2);
+        Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
     }
 }
 
@@ -20,7 +28,7 @@ pub struct Nullifier([u8; 32]);
 impl Nullifier {
     pub fn new(commitment: &Commitment, nsk: &NullifierSecretKey) -> Self {
         let mut bytes = Vec::new();
-        bytes.extend_from_slice(&commitment.to_bytes());
+        bytes.extend_from_slice(&commitment.to_byte_array());
         bytes.extend_from_slice(nsk);
         Self(Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap())
     }
@@ -41,4 +49,18 @@ mod tests {
         let nullifier = Nullifier::new(&commitment, &nsk);
         assert_eq!(nullifier, expected_nullifier);
     }
+
+    #[test]
+    fn test_from_secret_key() {
+        let nsk = [
+            50, 139, 109, 225, 82, 86, 80, 108, 140, 248, 232, 229, 96, 80, 148, 250, 15, 9, 155,
+            44, 196, 224, 115, 180, 160, 44, 113, 133, 15, 196, 253, 42,
+        ];
+        let expected_Npk = NullifierPublicKey([
+            38, 90, 215, 216, 195, 66, 157, 77, 161, 59, 121, 18, 118, 37, 57, 199, 189, 251, 95,
+            130, 12, 9, 171, 169, 140, 221, 87, 242, 46, 243, 111, 85,
+        ]);
+        let Npk = NullifierPublicKey::from(&nsk);
+        assert_eq!(Npk, expected_Npk);
+    }
 }