Add to listing.

Author: mzhang28

SUMMARY.md

@@ -2,6 +2,8 @@
 
 * [Introduction](README.md)
 * [Binary Exploitation](/binary-exploitation.md)
+  * [Doubly Dangerous \[110 points\]](/binary-exploitation/doubly-dangerous-110-points.md)
+  * [Simple ROP \[120 points\]](/binary-exploitation/simple-rop-120-points.md)
   * [Heaps of Knowledge \[420 points\]](/binary-exploitation/heaps-of-knowledge-420-points.md)
 * [Cryptography](cryptography.md)
   * [RSA 1 \[50 points\]](/cryptography/rsa-1-50-points.md)

binary-exploitation.md

@@ -3,8 +3,8 @@
 This category focuses on exploiting vulnerabilities in "binaries", or compiled programs, such as buffer overflow attacks, return-oriented programming, etc. The binary exploitation challenges this year include:
 
 * Risky Business \[100 points\]
-* Doubly Dangerous \[110 points\]
-* Simple ROP \[120 points\]
+* [Doubly Dangerous \[110 points\]](/binary-exploitation/doubly-dangerous-110-points.md)
+* [Simple ROP \[120 points\]](/binary-exploitation/simple-rop-120-points.md)
 * [Heaps of Knowledge \[420 points\]](/binary-exploitation/heaps-of-knowledge-420-points.md)