diff --git a/stepmania/src/crypto51/pubkey.h b/stepmania/src/crypto51/pubkey.h
index 3d733d25eb..5bb3cadbca 100644
--- a/stepmania/src/crypto51/pubkey.h
+++ b/stepmania/src/crypto51/pubkey.h
@@ -105,22 +105,6 @@ public:
 
 // ********************************************************
 
-//! .
-class PK_EncryptionMessageEncodingMethod
-{
-public:
-	virtual ~PK_EncryptionMessageEncodingMethod() {}
-
-	//! max size of unpadded message in bytes, given max size of padded message in bits (1 less than size of modulus)
-	virtual unsigned int MaxUnpaddedLength(unsigned int paddedLength) const =0;
-
-	virtual void Pad(RandomNumberGenerator &rng, const byte *raw, unsigned int inputLength, byte *padded, unsigned int paddedBitLength) const =0;
-
-	virtual DecodingResult Unpad(const byte *padded, unsigned int paddedBitLength, byte *raw) const =0;
-};
-
-// ********************************************************
-
 //! .
 template <class TFI, class MEI>
 class TF_Base
@@ -585,9 +569,6 @@ public:
 #endif
 };
 
-//! Base class for public key encryption standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
-struct EncryptionStandard {};
-
 //! Base class for public key signature standard classes. These classes are used to select from variants of algorithms. Note that not all standards apply to all algorithms.
 struct SignatureStandard {};