1 files changed, 3 insertions, 0 deletions
diff --git a/crypto/src/math/ec/ECCurve.cs b/crypto/src/math/ec/ECCurve.cs
index 889da292f..eaa3e0c3d 100644
--- a/crypto/src/math/ec/ECCurve.cs
+++ b/crypto/src/math/ec/ECCurve.cs
@@ -387,6 +387,9 @@ namespace Org.BouncyCastle.Math.EC
                     BigInteger X = new BigInteger(1, encoded, 1, expectedLength);
 
                     p = DecompressPoint(yTilde, X);
+                    if (!p.SatisfiesCofactor())
+                        throw new ArgumentException("Invalid point");
+
                     break;
                 }