Information Security: Protecting Computers and Resources from Threats, Slides of Computer Security

Download Information Security: Protecting Computers and Resources from Threats and more Slides Computer Security in PDF only on Docsity! Introduction to Information Security Computer Recovery Docsity.com Protection of Personal Computers • Security Policy – Formal – Informal • Security Mechanisms – Identification and Authentication – Access Control – Applications and updates – Physical security – Network-level security Docsity.com Natural Disasters • Computer systems – Same vulnerability as homes, cars, etc. – Additional sensitivity: operating environment, e.g., temperature, humidity, etc. • Vulnerable component: – Hardware devices – Data and software • Goal: reduce the impact of a disaster Docsity.com How to Measure Impact? • Economic impact: – How much does it cost to recover to a pre-attack state? – Cost: replacing hardware/software/data, irreplaceable components, loss of productivity, long term losses, etc. • Personal computer: – Replace hardware – Replace data and applications Docsity.com Replace Damaged Hardware Most computer systems are standard • Ready available supply  quick replace • Easily measurable cost of new purchases • Cost balance: – Insurance – Leasing or renting computers and/or facilities Docsity.com Flood • Time to respond: Depending on the type of flood there may be enough time for orderly shut down and saving the equipment • Losses: hardware, software, data, productivity, etc. • Recovery support: store backup in secure locations Docsity.com Fire • Time to respond: requires quick respons • Losses: hardware, software, data, productivity, etc. – Secondary damage from fire extinguisher (water). New methods: carbon dioxide or gas-based extinguisher • Recovery support: – Fire safety planning of facilities, e.g., fire resistant doors and walls, control of spreading of smoke and fire – Safety of humans – fire drills – Store backup in secure locations Docsity.com Power Problems • Power Loss – Criticality of the system – Estimated time of loss – Protection: uninterruptible power supply • Power fluctuation – Drops, spikes, surges – Weather conditions (lightning) – Effects all hardware via electric lines, phone and cable connections – Protection: surge protectors, unplug devices Docsity.com Backup Plan • Backup: copy of all or part of a file to assist in reestablishing a lost file • Types of backup: – Complete backup • Everything on the system is copied • Often automated and done at regular intervals – Revolving backup • Last several backups are kept • Avoid problem with corrupted media – Selective backup • Only files that have changed since the last backup are copied • Full backup + selective backup  complete record of change Docsity.com Offsite Backup • Backup is useless if it is destroyed in the crisis! • Keep backup version separate from actual system • Backup location types: – Networked storage – Cold sites: facility that can accommodate computing centers (need to place hardware and load backups) – Hot sites: computing facility with installed and ready-to-run computing system (need to load backups) Docsity.com Personal Computer Users • Generally do not make backups • Even minor crises have devastating effects • Need to use available support to create backup – Set intervals for regular backup – Perform backup – Store copies in secure location Docsity.com To install the Backup utility from the Windows XP CD • Insert your Windows XP CD into the CD drive or DVD drive of the computer. • Click Exit • Locate the CDDrive:\ValueAdd\Msft\Ntbackup folder on the CD • Double-click Ntbackup.msi to install the Backup utility • When the Backup or Restore Wizard prompts you, click Finish • Remove the Windows XP CD Docsity.com XP Backup Start Backup: 1. Click Start, point to All Programs, point to Accessories, point to System Tools, and then click Backup to start the wizard 2. Click Next to skip past the opening page, choose Back up files and settings from the second page, and then click Next Docsity.com Decide What to Back Up • All information on this computer ??? – Think twice! – Size of the backup • My documents and settings – Better choice – Limit the amount of data on the backup • Other options – Everyone's documents and settings – Let me choose what to back up -- Items to Back Up Docsity.com Other Backup Alternatives • Back up your e-mail and nothing else:Try OutBack Plus 4 or the Microsoft Outlook Personal Folders Backup Utility • Option to restore your entire hard drive: drive imaging tools like PowerQuest Drive Image 2002 can take a virtual snapshot of your disk • Protect backup copies from fire, flood, or theft: online backup alternatives like Xdrive Plus or @Backup, where you can upload your most important files for storage on a secure server Docsity.com Next Class • Data Recovery with Windows XP 26 Docsity.com