https://homeostasis.scs.carleton.ca/wiki/api.php?action=feedcontributions&feedformat=atom&user=Erik+B 2026-06-03T02:00:51Z User contributions MediaWiki 1.42.1 https://homeostasis.scs.carleton.ca/wiki/index.php?title=SystemsSec_2018W_Lecture_3&diff=21426 2018-01-19T05:58:39Z

<p>Erik B: fixing formatting</p> <hr /> <div>= Notes =<br /> Class 3, January 12<br /> <br /> == 1st Era (Time Sharing) ==<br /> Computing originated from cracking codes during WWII.<br /> <br /> Initial computer security came from physical security. Security measures were put in place to limit physical access.<br /> <br /> ; Mainframes : Large, powerful computers. Early models of which implemented no implicit security. It was based on access to the system.<br /> ; Batch Processing: Processing written programs in batches. Programs were written offline then queued to be ran one after the other.<br /> ; Time Sharing :An environment option for Mainframes. They allowed many users to access the same machine concurrently.<br /> <br /> This caused a need for computer systems security. Policies were developed (more organizational policies than strict security), early creation of software based access control.<br /> ; Access control<br /> : Users, Groups<br /> : Permissions<br /> : ACLs (Access control list)<br /> <br /> == 2nd Era (Personal Computers) ==<br /> Computers for personal use. Peer to peer file sharing (via floppy disks, etc...).<br /> <br /> The era of personal computers introduced copy protection and piracy as files could now be shared among peers and copied onto their own computer.<br /> <br /> ; Copy protection<br /> : any effort designed to prevent the reproduction of software, films, music, and other media, usually for copyright reasons.<br /> : essentially telling a personal computer not to do what it was made to do.<br /> <br /> ; Piracy : the unauthorized use or reproduction of another's work.<br /> <br /> <br /> Sharing software from unknown sources allowed for &quot;malicious&quot; programs to spread. The invention of computer viruses and therefore anti-virus software.<br /> <br /> == 3rd Era (Networking) ==<br /> Computers are now interconnected, attacks are possible through the internet. See [https://en.wikipedia.org/wiki/Morris_worm Morris Worm]<br /> <br /> More complicated security measures necessary. From an attackers perspective: find exploits, infect systems. From a defenders perspective: find exploits before they're used, patch them, or patch exploits after they're used.<br /> <br /> &quot;The internet today is a result of evolution.&quot;<br /> <br /> ''' Unix Directory System '''<br /> ** Labels for processes, files, directories, read/write/execute permissions.<br /> *** Users: UID<br /> *** Groups: GID<br /> * Designed for multi-user systems. Works for single user systems as some processes require more permissions than others. Still in place due to legacy systems. Is considered robust due to evolution.<br /> <br /> ''' Military '''<br /> The military and intelligence organizations cared about security from the beginning. Developed their own systems to enforce classification levels. Was convoluted and is no longer in use.<br /> <br /> = E1 results =<br /> 9 Firewall<br /> 8 Windows Defender<br /> 5 Windows Firewall<br /> 5 https<br /> 5 Google Authenticator<br /> 4 SSL<br /> 4 Passwords<br /> 3 VPN<br /> 3 uBlock Origin<br /> 3 SSH<br /> 3 KeePass<br /> 3 firewall<br /> 3 Cryptography<br /> 3 Antivirus<br /> 3 2FA<br /> 2 Wireshark<br /> 2 vpn<br /> 2 Virtual Machines<br /> 2 Valve Anti Cheat<br /> 2 traceroute<br /> 2 password<br /> 2 OpenVPN<br /> 2 netstat<br /> 2 Netcat<br /> 2 md5sum<br /> 2 Malwarebytes Anti-Malware<br /> 2 Malwarebytes<br /> 2 HTTPS<br /> 2 Filevault<br /> 2 encryption<br /> 2 Anti-virus<br /> 2 antivirus<br /> 2 access control</div>

Erik B https://homeostasis.scs.carleton.ca/wiki/index.php?title=SystemsSec_2018W_Lecture_3&diff=21425 2018-01-19T05:57:24Z

<p>Erik B: Added notes.</p> <hr /> <div>= Notes =<br /> Class 3, January 12<br /> <br /> == 1st Era (Time Sharing) ==<br /> Computing originated from cracking codes during WWII.<br /> <br /> Initial computer security came from physical security. Security measures were put in place to limit physical access.<br /> <br /> ; Mainframes : Large, powerful computers. Early models of which implemented no implicit security. It was based on access to the system.<br /> ; Batch Processing: Processing written programs in batches. Programs were written offline then queued to be ran one after the other.<br /> ; Time Sharing :An environment option for Mainframes. They allowed many users to access the same machine concurrently.<br /> <br /> This caused a need for computer systems security. Policies were developed (more organizational policies than strict security), early creation of software based access control.<br /> ; Access control<br /> : Users, Groups<br /> : Permissions<br /> : ACLs (Access control list)<br /> <br /> == 2nd Era (Personal Computers) ==<br /> Computers for personal use. Peer to peer file sharing (via floppy disks, etc...).<br /> <br /> The era of personal computers introduced copy protection and piracy as files could now be shared among peers and copied onto their own computer.<br /> <br /> ; Copy protection<br /> : any effort designed to prevent the reproduction of software, films, music, and other media, usually for copyright reasons.<br /> ; essentially telling a personal computer not to do what it was made to do.<br /> <br /> ; Piracy : the unauthorized use or reproduction of another's work.<br /> <br /> <br /> Sharing software from unknown sources allowed for &quot;malicious&quot; programs to spread. The invention of computer viruses and therefore anti-virus software.<br /> <br /> == 3rd Era (Networking) ==<br /> Computers are now interconnected, attacks are possible through the internet. See [https://en.wikipedia.org/wiki/Morris_worm Morris Worm]<br /> <br /> More complicated security measures necessary. From an attackers perspective: find exploits, infect systems. From a defenders perspective: find exploits before they're used, patch them, or patch exploits after they're used.<br /> <br /> &quot;The internet today is a result of evolution.&quot;<br /> <br /> ''' Unix Directory System '''<br /> ** Labels for processes, files, directories, read/write/execute permissions.<br /> *** Users: UID<br /> *** Groups: GID<br /> * Designed for multi-user systems. Works for single user systems as some processes require more permissions than others. Still in place due to legacy systems. Is considered robust due to evolution.<br /> <br /> ''' Military '''<br /> The military and intelligence organizations cared about security from the beginning. Developed their own systems to enforce classification levels. Was convoluted and is no longer in use.<br /> <br /> = E1 results =<br /> 9 Firewall<br /> 8 Windows Defender<br /> 5 Windows Firewall<br /> 5 https<br /> 5 Google Authenticator<br /> 4 SSL<br /> 4 Passwords<br /> 3 VPN<br /> 3 uBlock Origin<br /> 3 SSH<br /> 3 KeePass<br /> 3 firewall<br /> 3 Cryptography<br /> 3 Antivirus<br /> 3 2FA<br /> 2 Wireshark<br /> 2 vpn<br /> 2 Virtual Machines<br /> 2 Valve Anti Cheat<br /> 2 traceroute<br /> 2 password<br /> 2 OpenVPN<br /> 2 netstat<br /> 2 Netcat<br /> 2 md5sum<br /> 2 Malwarebytes Anti-Malware<br /> 2 Malwarebytes<br /> 2 HTTPS<br /> 2 Filevault<br /> 2 encryption<br /> 2 Anti-virus<br /> 2 antivirus<br /> 2 access control</div>

Erik B