diff --git a/year4/semester2/CT437/materials/prog b/year4/semester2/CT437/materials/prog
index 27409fca..1c0df581 100644
--- a/year4/semester2/CT437/materials/prog
+++ b/year4/semester2/CT437/materials/prog
@@ -7,11 +7,11 @@
 06 - [X] ct437_04 - Stream Ciphers.pdf
 07 - [X] ct437_05 - Hash Functions and MACs.pdf
 08 - [X] ct437_06 - Hash Cracking and Rainbow Tables.pdf
-09 - [ ] ct437_06 - Public Key Cryptography.pdf
-10 - [ ] ct437_07 - Key Distribution.pdf
+09 - [X] ct437_06 - Public Key Cryptography.pdf
+10 - [X] ct437_07 - Key Distribution.pdf
 
-11 - [ ] ct437_08- Digital Certificates.pdf
-12 - [ ] ct437_09 - Secure Network Communication Principals.pdf
-13 - [ ] ct437_10a - Case Study Heartbleed.pdf
-14 - [ ] ct437_10 - TLS.pdf
-15 - [ ] ct437_11 - IPSec.pdf
+11 - [X] ct437_08- Digital Certificates.pdf
+12 - [X] ct437_09 - Secure Network Communication Principals.pdf
+13 - [X] ct437_10 - TLS.pdf
+14 - [X] ct437_10a - Case Study Heartbleed.pdf
+15 - [X] ct437_11 - IPSec.pdf