diff --git a/year4/semester2/CT437/materials/ct437_08- Digital Certificates.pdf b/year4/semester2/CT437/materials/ct437_08- Digital Certificates.pdf new file mode 100644 index 00000000..9a38f48e Binary files /dev/null and b/year4/semester2/CT437/materials/ct437_08- Digital Certificates.pdf differ