diff --git a/cryptlib.h b/cryptlib.h
index 80c1f03f..5cc94c61 100644
--- a/cryptlib.h
+++ b/cryptlib.h
@@ -2307,6 +2307,10 @@ class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CryptoParameters : public GeneratableCrypt
 };
 
 /// \brief Interface for asymmetric algorithms
+/// \details BERDecode() and DEREncode() were removed under Issue 569
+///   and Commit XXX. Programs should use <tt>AccessMaterial().Load(bt)</tt>
+///   or <tt>AccessMaterial().Save(bt)</tt> instead.
+/// \sa <A HREF="https://github.com/weidai11/cryptopp/issues/569">Issue 569</A>
 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AsymmetricAlgorithm : public Algorithm
 {
 public:
@@ -2320,17 +2324,21 @@ public:
 	/// \return a const reference to the crypto material
 	virtual const CryptoMaterial & GetMaterial() const =0;
 
+#if 0
 	/// \brief Loads this object from a BufferedTransformation
 	/// \param bt a BufferedTransformation object
+	/// \details Use of BERDecode() changed to Load() at Issue 569.
 	/// \deprecated for backwards compatibility, calls <tt>AccessMaterial().Load(bt)</tt>
 	void BERDecode(BufferedTransformation &bt)
 		{AccessMaterial().Load(bt);}
 
 	/// \brief Saves this object to a BufferedTransformation
 	/// \param bt a BufferedTransformation object
+	/// \details Use of DEREncode() changed to Save() at Issue 569.
 	/// \deprecated for backwards compatibility, calls GetMaterial().Save(bt)
 	void DEREncode(BufferedTransformation &bt) const
 		{GetMaterial().Save(bt);}
+#endif
 };
 
 /// \brief Interface for asymmetric algorithms using public keys
diff --git a/randpool.h b/randpool.h
index cd823862..6dd70dc8 100644
--- a/randpool.h
+++ b/randpool.h
@@ -64,7 +64,7 @@ private:
 /// \details You should migrate away from OldRandomPool at the earliest opportunity. Use a
 ///   modern random number generator or key derivation function, like AutoSeededRandomPool or
 ///   HKDF.
-/// \deprecated This class uses an old style PGP 2.6.x with MDC. The generator risks reusing
+/// \warning This class uses an old style PGP 2.6.x with MDC. The generator risks reusing
 ///   random random numbers after state rollback. You should migrate away from OldRandomPool
 ///   at the earliest opportunity.
 /// \sa RandomPool, AutoSeededRandomPool, HKDF, P1363_KDF2, PKCS12_PBKDF, PKCS5_PBKDF2_HMAC
diff --git a/test.cpp b/test.cpp
index 63d72021..7b1e8176 100644
--- a/test.cpp
+++ b/test.cpp
@@ -455,17 +455,18 @@ SecByteBlock HexDecodeString(const char *hex)
 
 void GenerateRSAKey(unsigned int keyLength, const char *privFilename, const char *pubFilename, const char *seed)
 {
+	// DEREncode() changed to Save() at Issue 569.
 	RandomPool randPool;
 	randPool.IncorporateEntropy((byte *)seed, strlen(seed));
 
 	RSAES_OAEP_SHA_Decryptor priv(randPool, keyLength);
 	HexEncoder privFile(new FileSink(privFilename));
-	priv.DEREncode(privFile);
+	priv.AccessMaterial().Save(privFile);
 	privFile.MessageEnd();
 
 	RSAES_OAEP_SHA_Encryptor pub(priv);
 	HexEncoder pubFile(new FileSink(pubFilename));
-	pub.DEREncode(pubFile);
+	pub.AccessMaterial().Save(pubFile);
 	pubFile.MessageEnd();
 }
 
diff --git a/validat2.cpp b/validat2.cpp
index c8537c30..49af29b4 100644
--- a/validat2.cpp
+++ b/validat2.cpp
@@ -898,12 +898,13 @@ bool ValidateEC2N()
 {
 	std::cout << "\nEC2N validation suite running...\n\n";
 
+	// DEREncode() changed to Save() at Issue 569.
 	ECIES<EC2N>::Decryptor cpriv(GlobalRNG(), ASN1::sect193r1());
 	ECIES<EC2N>::Encryptor cpub(cpriv);
 	ByteQueue bq;
-	cpriv.DEREncode(bq);
+	cpriv.AccessMaterial().Save(bq);
 	cpub.AccessKey().AccessGroupParameters().SetEncodeAsOID(true);
-	cpub.DEREncode(bq);
+	cpub.AccessMaterial().Save(bq);
 	ECDSA<EC2N, SHA1>::Signer spriv(bq);
 	ECDSA<EC2N, SHA1>::Verifier spub(bq);
 	ECDH<EC2N>::Domain ecdhc(ASN1::sect193r1());