diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26792b0cd..9185a6ba0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,16 @@ and this project adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
-### Added
+### added
+- Added [Visibility crate](https://crates.io/crates/visibility) to modify
+visibility of methods and struct for the `unstable-frost` feature.
+- Added `SpendValidatingKey` serialization and deserialization from bytes
+visibility under the `unstable-frost` feature
+  - `orchard::keys::SpendValidatingKey`
+- Added `from_sk_and_ask::keys::FullViewingKey::from_sk_and_ask` under the
+`unstable-frost` feature flag
+- Added `from_sk_and_ask::keys::FullViewingKey::from_checked_parts` under the
+`unstable-frost` feature flag
 - `orchard::keys::SpendValidatingKey::{from_bytes, to_bytes}` behind the
   `unstable-frost` feature flag. These are temporary APIs exposed for development
   purposes, and will be replaced by type-safe FROST APIs once ZIP 312 key
diff --git a/src/keys.rs b/src/keys.rs
index f66928eeb..cd61daa0c 100644
--- a/src/keys.rs
+++ b/src/keys.rs
@@ -225,6 +225,7 @@ impl SpendValidatingKey {
 /// [`Note`]: crate::note::Note
 /// [orchardkeycomponents]: https://zips.z.cash/protocol/nu5.pdf#orchardkeycomponents
 #[derive(Copy, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[cfg_attr(feature = "unstable-frost", visibility::make(pub))]  
 pub(crate) struct NullifierDerivingKey(pallas::Base);
 
 impl NullifierDerivingKey {
@@ -266,6 +267,7 @@ impl NullifierDerivingKey {
 ///
 /// [orchardkeycomponents]: https://zips.z.cash/protocol/nu5.pdf#orchardkeycomponents
 #[derive(Copy, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+#[cfg_attr(feature = "unstable-frost", visibility::make(pub))]
 pub(crate) struct CommitIvkRandomness(pallas::Scalar);
 
 impl From<&SpendingKey> for CommitIvkRandomness {
@@ -333,6 +335,36 @@ impl From<FullViewingKey> for SpendValidatingKey {
 }
 
 impl FullViewingKey {
+    /// Creates a `FullViewingKey` from a `SpendingKey` and `SpendValidatingKey`.
+    /// This is necessary for FROST key management.
+    ///
+    /// Note: See [FROST Book - Technical details](https://frost.zfnd.org/zcash/technical-details.html)
+    #[cfg(feature = "unstable-frost")]
+    pub fn from_sk_and_ask(sk: &SpendingKey, ask: SpendValidatingKey) -> FullViewingKey {
+        FullViewingKey {
+            ak: ask,
+            nk: NullifierDerivingKey::from(sk),
+            rivk: CommitIvkRandomness::from(sk),
+        }
+    }
+
+    /// Creates a `FullViewingKey` from its checked parts. This is necessary for FROST
+    /// key management in order to avoid centralizing spend authority in a backup scheme.
+    ///
+    /// Note: See [FROST Book - Technical details - Backing Up Key Shares](https://frost.zfnd.org/zcash/technical-details.html)
+    #[cfg(feature = "unstable-frost")]
+    pub fn from_checked_parts(
+        ask: SpendValidatingKey,
+        nk: NullifierDerivingKey,
+        rivk: CommitIvkRandomness,
+    ) -> FullViewingKey {
+        FullViewingKey {
+            ak: ask,
+            nk,
+            rivk,
+        }
+    }
+
     pub(crate) fn nk(&self) -> &NullifierDerivingKey {
         &self.nk
     }