PGP key serialization and deserialization

        public static string PrivateKeyToString(PgpPrivateKey key)
        {
            PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(key.Key);
            byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetDerEncoded();
            return Convert.ToBase64String(serializedPrivateBytes);
        }
        public static string PublicKeyToString(PgpPublicKey key)
        {
            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(key.GetKey());
            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
            return Convert.ToBase64String(serializedPublicBytes);
        }
        public static PgpPrivateKey PrivateKeyFromString(string serialized, long keyId)
        {
            AsymmetricKeyParameter akp = PrivateKeyFactory.CreateKey(Convert.FromBase64String(serialized));
            return new PgpPrivateKey(akp, keyId);
        }
        public static PgpPublicKey PublicKeyFromString(string serialized, DateTime creationTime)
        {
            AsymmetricKeyParameter akp = PublicKeyFactory.CreateKey(Convert.FromBase64String(serialized));
            return new PgpPublicKey(PublicKeyAlgorithmTag.RsaGeneral, akp, creationTime);
        }