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1 Chapter 9 Data Protection Introduction Data Protection: Backup Backup Media and RAID Data Storage Policies Database Security Data Loss Prevention
2 Data s Role In Business Data are the principal elements of any information system Businesses gather enormous amounts of data Information is then extracted for decision making Data are valuable assets that are core components of a larger corporate strategy Source code, intellectual property, user data, etc. must all be protected We will primarily focus on securing data while it is being stored How How How How backup can prevent accidental data loss to securely store data in a database to prevent data from being taken out of the corporation to securely dispose of data 2
3 Data Protection: Backup Importance In an incident, you may lose all data that is not backed up Threats That Are Addressed by Backup Mechanical hard drive failure or damage in a fire or flood Data on lost or stolen computers is not available to the organization Malware can reformat the hard drive or do other data destruction Scope of Backup Fraction of information on the hard drive that is backed up File/Directory Data Backup Select data files and directories to be backed up (Do not forget items on the desktop!) Not good for programs 3
4 Scope of Backup 1 File/Directory Data Backup Windows Backup Image Backup Everything, including programs and settings Image backup is very slow Data files change the most rapidly, so doing several file/directory data backups for each image backup may be appropriate 4
5 Scope of Backup 2 Shadowing A backup copy of each file being worked on is written every few minutes to the hard drive, or to another location 5
6 Full vs. Incremental Backup Full backups All files and directories Slow, so it is typically done weekly Incremental Backups Only records changes since the last backup Fast, so usually done daily Do incremental backups until the next full backup Restoration Order Restore the full backup first Then restore incremental backups in the order created Otherwise, newer files will be overwritten Generations Save several generations of full backups Do not usually save incremental backups after the next full backup 6
7 Centralized Backup Local backup on individual PCs is difficult to enforce. Centralized backup provides backup labor and enforcement. 7
8 Backup Technologies Continuous Data Protection (CDP) Used when a firm has two server locations Each location backs up the other in real time Other site can take over very quickly in case of a disaster, with little data loss Requires expensive highspeed transmission link between the sites Online/Cloud Backup Service Online backup services work much like traditional backup software With an online backup service, however, your important data is transmitted over the Internet and securely stored on a server in a professional data center The advantage of having your important data backed up off-site, away from your home or office, is that it's safe from theft, fire, and other local disasters The disadvantage is that you have to rely on your service provider for security, good or bad? 8
9 Mesh Backup PCs back up one another. Data is stored redundantly. Security issues must be addressed. 9
10 Backup Media Servers Normally Use Magnetic Tape Second hard drive on computer Very fast backup Lost if computer is stolen or burns in a fire Backup on tape occasionally for archival (long-term) storage Clients Normally Use Optical Disks (DVDs) Slow but inexpensive per bit stored Attraction is that almost all users have optical disk burners Dual-layer DVDs offer about 8 GB of capacity Usually not enough so user may have to insert additional disks to do backup Backup to a second client PC hard drive; then occasionally backup onto optical disks The life of information on optical disks is unknown Cloud/Online Backup Services as Amazon Glacier, file syncing services as Google Drive or data storage as Microsoft OneDrive
11 Disk Arrays and RAID Levels RAID Redundant Array of Independent Disks Multiple hard drives within a single system Increased reliability and performance A single hard drive failure won t necessarily precipitate data loss Multiple disks can be written to simultaneously RAID Levels Ways of configuring multi-disk arrays 11
12 No RAID vs RAID Level 0 (zero) Shipping boxes Storing Data 12
13 Disk Arrays and RAID Level 1 Striping Writing data simultaneously across multiple disks Very fast, but no reliability One disk failure will cause complete data loss Mirroring Creating an exact copy of a disk at the same time Data transfer speeds remain nominal Virtually no data loss, but more costly to buy additional hard drives 13
14 Recovery Times and Acceptable Data Loss 14
15 RAID Level 5 15
16 RAID Level 5 Recovery 16
17 Backup Management Policies 1 Backup Creation Policies Understand current system and future needs Create policies for different types of data and computers What should be backed up, how frequently, how frequently to test restorations, etc. Restoration Policies Do restoration tests frequently Media Storage Location Policies Store media at a different site Store backup media in a fireproof and waterproof safe until it can be moved offsite Encryption Policies Encrypt backup media before moving them, so confidential information will not be exposed if the tape is stolen or lost 17
18 Backup Management Policies 2 Strong Access Control Policies for Backup Media Checkouts are rare and therefore suspicious Checking out media can result in their loss and the damages that come with loss The manager of the person requesting the checkout should approve the checkout Data Retention Policies There are strong legal requirements for how long certain types of data must be kept The legal department must get involved in retention policies Auditing Policy Compliance All policies should be audited Includes tracing what happened in samples of data 18
19 Retention 1 Benefits of Retention Major part of corporate memory Can retrieve old for current purposes Dangers of Retention Legal discovery process Defendant must supply relevant s Potentially very damaging information Always expensive Even though very expensive to retrieve, firms must pay whatever is necessary to do so Accidental Retention Even if firms delete from mail servers, may be stored on backup tapes Users will often store copies on their own computers 19
20 Retention 2 Legal Archiving Requirements Many laws require retention Securities and Exchange Commission Labor laws Involuntary terminations Public information about job openings Medical problem complaints that may relate to toxic chemicals Laws vary in duration of storage requirements Fines or summary judgments if failure to retain and produce required s 20
21 Retention 3 Archiving Policies and Processes Must have them Must reflect a firm s legal environment Must be drawn up by the firm s legal department Message Authentication Spoofed messages can frame employees or the firm itself Need message authentication to prevent spoofed sender addresses User Training Never put anything in a message that you would not want seen in court, printed in the newspaper, or read by your boss 21
22 Spreadsheet Security and Vault Server 1 Spreadsheets are widely used and are the subject of many compliance regulations 2. Need for security testing Spreadsheets record each change for auditing purposes Spreadsheet vault server to implement controls 1. The vault server stores spreadsheets and strongly controls access to them. Authentication Authorizations Auditing 22
23 Spreadsheet Vault Server 2 3. Cryptographic protections for transmissions 4. Strong client security 23
24 Database Security 1 Databases Often used in mission-critical applications Require additional security precautions Relational databases: Tables (relations) with rows (records) and columns (attributes) As discussed earlier, avoid SQL injection attacks Restrict Access to Data Restrict users to certain columns (attributes) in each row For instance, deny access to salary column to most users Limit access control to rows For instance, only rows containing data about people in the user s own department 24
25 Table Used in Relational Databases 25
26 Restricting Access to Tables, Columns, and Rows 26
27 Database Security 2 Restrict granularity (level of detail) Prevent access to individual data Allow trend analysts to deal only with sums and averages for aggregates, such as departments Restrict information about the structure of the database itself (data model) Knowledge about the data model can make SQL injection much easier Database Access Control Restrict access to databases via database management systems (e.g., Microsoft SQL Server, MySQL, IBM DB2, Oracle, etc.) Rename administrator account, disable guest/public accounts, lowest possible permissions necessary SQL Injection Attacks Data must be sanitized to remove unacceptable characters Stored procedures can be used to sanitize and validate incoming data 27
28 Microsoft SQL Server Authentication Options 2. SQL Server authentication 1. Windows authentication 3. Password policy options 28
29 Database Auditing and Triggers Database Auditing Collect information about users interactions with databases Policy driven, reflecting legal and regulatory obligations What should be audited? Logins, changes to the database, warnings, exceptions, and special access Trigger Code that is automatically run when changes are made to a database Data Definition Language (DDL) trigger Used to produce automatic responses if the structure of the database has been altered (e.g., create new table, drop a table, alter properties of an existing table) Data Manipulation Language (DML) trigger Used to produce automatic responses if the data has been altered (e.g., data are inserted, updated, or deleted) 29
30 Salary Change Trigger (send ) CREATE TRIGGER EmployeeSalaryChange ON Employees FOR UPDATE AS varchar(1000) varchar(20) varchar(20) int int IF UPDATE (Salary) = = = Salary FROM deleted d = Salary FROM inserted = 'I just wanted to let you know ' ' changed their salary ' to EXEC = = 'Somebody changed their GO 30
31 Multi-Tiered Architecture 31
32 Data Protection: Encryption 1 Encryption Makes data unreadable to someone who does not have the key Prevents theft of private or trade secret information May reduce legal liability if lost or stolen data is encrypted What to Encrypt Files and directories or entire disk? Strong Login Authentication Is Needed Encryption is transparent to logged in users Once a user is logged in, he or she can see all encrypted data Protect with strong password or biometrics Ensure that the password is not lost File-Sharing Problems File sharing may be more difficult because files usually have to be decrypted before sending them to another computer 32
33 Data Protection: Encryption 2 CryptDB executes SQL queries over encrypted data using a collection of SQL-aware encryption schemes Key Escrow (managed by third party agent) Loss of the key is disastrous Not like losing a password that can be reset Key escrow stores a copy of the key in a safe place Bad if managed by user May not do it May not be able to find it If fired, may refuse to give it back, locking up all data on the computer Central key escrow on a corporate server is better 33
34 Data Loss Prevention Data Loss Prevention (DLP) A set of policies, procedures, and systems designed to prevent sensitive data from being released to unauthorized persons Data Collection Most companies collect more data than they can adequately protect Personally Identifiable Information (PII) Private employee or customer information that can be used to uniquely identify a person PII includes: Names (full name), personal identification numbers (SSN), addresses (street or ), personal characteristics (photos), and linking information (date of birth) Data Masking Obscuring data such that it cannot identify a specific person, but remains useful 34
35 Web Scraping Spiders (crawlers) Navigate the web gathering, organizing, and indexing web content Web Scraper Tool that extracts predefined data from specified webpages Can aggregate extracted data from multiple websites Mashup Combining data from various sites or applications 35
36 Yahoo! Pipes 36
37 Re-Identifying Data Latanya Sweeney, k-anonymity: a model for protecting privacy. International Journal on Uncertainty, Fuzziness and Knowledge-based Systems, 10 (5), 2002;
38 Information Triangulation 38
39 Document Restrictions 1 Document Restrictions Attempt to restrict what users can do to documents in order to reduce security threats Embryonic Digital Rights Management (DRM) Prevents unauthorized copying, printing, etc. May not be able to see parts of documents Data Extrusion Management Attempts to prevent restricted data files from leaving the firm without permission Watermark with invisible restriction indicators Can be notified if sent via attachments or FTP If each document is given a different watermark, can forensically see the source of a document leak Traffic analysis to look for unusually large numbers of outgoing files sent by a user 39
40 Data Loss Prevention System 40
41 Document Restrictions 2 Removable Media Controls Encrypted USB Drive Forbids the attachment of USB RAM drives and other portable media Reduces user abilities to make copies Perspective Have proven difficult to enforce Often reduces functionality in uncomfortable ways Companies have been reluctant to use them 41
42 Employee Training Social Networking Do not discuss work on personal blogs Do not talk about new marketing campaigns Do not post negative comments about products Be cautious about information posted on professional networks Competitors can use employee lists to hire away key employees 42
43 Data Destruction Is Necessary Backup media are not needed beyond their retention dates if a computer is to be discarded the computer is to be sold or given to another user Drive-wiping software for hard drives Reformatting the hard drive is not enough Shred CDs and DVDs Mobile/handheld equipment Whole flash memory needs to be encrypted and then factory reset 43
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