1 files changed, 1 insertions, 14 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP521R1Point.cs b/crypto/src/math/ec/custom/sec/SecP521R1Point.cs
index 44d590f08..fb1996cfd 100644
--- a/crypto/src/math/ec/custom/sec/SecP521R1Point.cs
+++ b/crypto/src/math/ec/custom/sec/SecP521R1Point.cs
@@ -3,7 +3,7 @@
 namespace Org.BouncyCastle.Math.EC.Custom.Sec
 {
     internal class SecP521R1Point
-        : ECPointBase
+        : AbstractFpPoint
     {
         /**
          * Create a point which encodes with point compression.
@@ -54,11 +54,6 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
             return new SecP521R1Point(null, AffineXCoord, AffineYCoord);
         }
 
-        protected internal override bool CompressionYTilde
-        {
-            get { return this.AffineYCoord.TestBitZero(); }
-        }
-
         public override ECPoint Add(ECPoint b)
         {
             if (this.IsInfinity)
@@ -267,14 +262,6 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
             return Twice().Add(this);
         }
 
-        public override ECPoint Subtract(ECPoint b)
-        {
-            if (b.IsInfinity)
-                return this;
-
-            return Add(b.Negate());
-        }
-
         public override ECPoint Negate()
         {
             if (IsInfinity)