diff --git a/src/pkcs1v15/decrypting_key.rs b/src/pkcs1v15/decrypting_key.rs
index 0bd6dc89..32982f6c 100644
--- a/src/pkcs1v15/decrypting_key.rs
+++ b/src/pkcs1v15/decrypting_key.rs
@@ -4,6 +4,8 @@ use crate::{
     traits::{Decryptor, EncryptingKeypair, RandomizedDecryptor},
     Result, RsaPrivateKey,
 };
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use alloc::vec::Vec;
 use rand_core::CryptoRngCore;
 use zeroize::ZeroizeOnDrop;
@@ -12,6 +14,7 @@ use zeroize::ZeroizeOnDrop;
 ///
 /// [RFC8017 § 7.2]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.2
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct DecryptingKey {
     inner: RsaPrivateKey,
 }
diff --git a/src/pkcs1v15/encrypting_key.rs b/src/pkcs1v15/encrypting_key.rs
index 80db0f60..ccf5eec2 100644
--- a/src/pkcs1v15/encrypting_key.rs
+++ b/src/pkcs1v15/encrypting_key.rs
@@ -1,12 +1,15 @@
 use super::encrypt;
 use crate::{traits::RandomizedEncryptor, Result, RsaPublicKey};
 use alloc::vec::Vec;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use rand_core::CryptoRngCore;
 
 /// Encryption key for PKCS#1 v1.5 encryption as described in [RFC8017 § 7.2].
 ///
 /// [RFC8017 § 7.2]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.2
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct EncryptingKey {
     pub(super) inner: RsaPublicKey,
 }
diff --git a/src/pkcs1v15/signature.rs b/src/pkcs1v15/signature.rs
index a07b6468..afc3043b 100644
--- a/src/pkcs1v15/signature.rs
+++ b/src/pkcs1v15/signature.rs
@@ -3,6 +3,8 @@
 use crate::algorithms::pad::uint_to_be_pad;
 use ::signature::SignatureEncoding;
 use alloc::{boxed::Box, string::ToString};
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use core::fmt::{Debug, Display, Formatter, LowerHex, UpperHex};
 use num_bigint::BigUint;
 use spki::{
@@ -14,6 +16,7 @@ use spki::{
 ///
 /// [RFC8017 § 8.2]: https://datatracker.ietf.org/doc/html/rfc8017#section-8.2
 #[derive(Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct Signature {
     pub(super) inner: BigUint,
     pub(super) len: usize,
diff --git a/src/pkcs1v15/signing_key.rs b/src/pkcs1v15/signing_key.rs
index 24754589..232c99f9 100644
--- a/src/pkcs1v15/signing_key.rs
+++ b/src/pkcs1v15/signing_key.rs
@@ -3,6 +3,8 @@ use crate::{dummy_rng::DummyRng, Result, RsaPrivateKey};
 use alloc::vec::Vec;
 use core::marker::PhantomData;
 use digest::Digest;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use pkcs8::{
     spki::{
         der::AnyRef, AlgorithmIdentifierRef, AssociatedAlgorithmIdentifier,
@@ -20,6 +22,7 @@ use zeroize::ZeroizeOnDrop;
 ///
 /// [RFC8017 § 8.2]: https://datatracker.ietf.org/doc/html/rfc8017#section-8.2
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct SigningKey<D>
 where
     D: Digest,
diff --git a/src/pkcs1v15/verifying_key.rs b/src/pkcs1v15/verifying_key.rs
index fafb4a4d..9464aef0 100644
--- a/src/pkcs1v15/verifying_key.rs
+++ b/src/pkcs1v15/verifying_key.rs
@@ -3,6 +3,8 @@ use crate::RsaPublicKey;
 use alloc::vec::Vec;
 use core::marker::PhantomData;
 use digest::Digest;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 use pkcs8::{
     spki::{
         der::AnyRef, AlgorithmIdentifierRef, AssociatedAlgorithmIdentifier,
@@ -16,6 +18,7 @@ use signature::{hazmat::PrehashVerifier, DigestVerifier, Verifier};
 ///
 /// [RFC8017 § 8.2]: https://datatracker.ietf.org/doc/html/rfc8017#section-8.2
 #[derive(Debug)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct VerifyingKey<D>
 where
     D: Digest,