Privacy and Encryption in egovernment. Dewey Landrum Technical Architect CSO SLED West Sector CISSP August 11, 2008
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1 Privacy and Encryption in egovernment Dewey Landrum Technical Architect CSO SLED West Sector CISSP August 11, 2008
2 Privacy Regulations Health Insurance Portability and Accountability Act (HIPPA) Gramm-Leach-Bliley Act (GLBA) Texas Administrative Code TAC, Title 1, Part 10, Chapter 202 Texas Public Information Act Part III, Chapter 252 Right to Access Special Right to Access SubChapter C - Information Excepted Most Useful Source 2
3 Privacy Act and Portals 3
4 Examples of Private Information Personal Information Litigation & Negotiations Competition or Bidding Information Location or Price of Property Records that would interfere with prosecution Student Records Birth (75 years) & Death (25 years) Records Audit Working Papers Addresses, Telephone Numbers, Social Security Numbers, & Personal Family Information of state employees & peace officers Photographs of law enforcement & security guards 4
5 Examples Continued Certain addresses Crime Victim Information Family Violence & Shelter work information Information related to Computer Security Issues Military Discharge Records (DD years) Many others not listed 5
6 The Confusion of Encryption Encryption can be a very confusing topic Various algorithms DES, Triple DES, AES, BLOWFISH, etc. Asymmetrical versus Symmetrical Asymmetrical usually two keys One for everyone to encrypt to (public key) One for just you to decrypt by (private key) Symmetrical One key used to decrypt and encrypt by Different opinions on what and when to encrypt Encrypt everything Encrypt just what you need Plus it s based on advanced math! 6
7 A Cornucopia of Standards NIST SP Guidelines for Implementing Cryptography in Federal Government NIST SP C Block Cypher Modes of Operation: Authentication & Confidentiality FIPS Secure Hash Standards FIPS Digital Signature Standards FIPS 192 Advanced Encryption Standard (AES) Many other government based standards FISMA PCI HIPPA GLBA 7
8 Why Encrypt? Encryption is used to keep sensitive information private Military and Governments have used various forms of encryption for centuries Only recently widely used by businesses and civilians Encryption can be used to encrypt information in the following ways: While information is being moved from one place to another (in transit) While information is being processed While information is being stored 8
9 What are all these algorithms? DES, Triple DES, AES, etc. As computing power becomes greater, various encryption standards become effectively weaker DES was once so strong, the government asked that it be weakened so it could be broken if necessary Triple DES is just DES run through the encryption/decryption process three times AES (Advanced Encryption Standard) is the latest government standard These are basically the mathematical formulas for encrypting and decrypting data 9
10 Asymmetrical Keys A fancy word that basically means: I have two keys that aren t the same. One key for encryption, one key for decryption. Asymmetrical two keys that aren t the same Used so that many people can send information to one source without the senders being able to decrypt the information They must have their own key if they are going to receive encrypted information. Must deal with the problem of having to have the public key for everyone receiving information. Biggest issue is key distribution. Takes more processing power because you may be encrypting to many keys at once. 10
11 Symmetrical Keys A fancy word that basically means: I have one key to encrypt and decrypt by. Symmetrical one key used for encryption and decryption Typically used for small groups of people or for applications accessing the same data Faster than Asymmetrical because there s only one key Everyone that is going to encrypt or decrypt must have the same key How do you prevent the key from being distributed to unauthorized people? How do you know the key isn t being accessed by someone not authorized to access it? What if the key gets corrupt or compromised? How do I change the keys? 11
12 Differing Opinions on Encryption There are two basic views on encrypting network traffic: Encrypt everything from the client browser connection to the database Encrypt only what needs to be encrypted until you get to a trusted environment 12
13 Encrypt Everything Encrypt everything from the client browser connection to the database, including network traffic Use SSL (Secure Socket Layer) to encrypt the connection to the web server so it can t be intercepted over the Internet Encrypt internal traffic (SSL or IPSEC) so it can t be intercepted by either staff members or rogue users Encrypt it in the database so if someone breaks in and steals the data, it is still encrypted 13
14 Problems with Encrypt Everything There are various issues with SSL browser compatibility Older browsers may not support 128 bit encryption Export laws if you only support 128 bit encryption, you may not be able to support world wide commerce Encrypting internal traffic blocks the ability to monitor attacks Most Intrusion Prevention/Detection Systems don t support decryption of traffic for inspection - they are blind to encrypted attacks Many of the better hacking tools now support SSL as an option - hackers chose this option to hide their attacks from Intrusion Prevention/ Detection systems Host-based IPS can decrypt traffic for inspection, but is much more expensive to put on every host than deployment of a network-based sensor Database encryption works only if they are outside of the application and do not have access to the keys It s much more expensive disks, network bandwidth, processing time, etc. 14
15 Encrypt Only What You Need To Encrypt only what is required to protect data Use SSL (Secure Socket Layer) to encrypt the connection to the web server so it can t be intercepted over the Internet and only when you are passing sensitive information Encrypt internal traffic only when it is very sensitive information and you are in a mixed network environment If you don t trust your data center or internal staff, maybe you need new staff Encrypt only the columns in the database that contain sensitive information 15
16 Problems with Encrypt What You Need To SSL is still vulnerable to Man-in-the Middle attacks Various versions of SSL have vulnerabilities like any other piece of software - must keep it updated Must force connections to redirect to encryption Web servers are frequently breached, which gives a beach head for sniffing internal traffic that is not encrypted Staff members steal more data than hackers - encrypted internal traffic helps stop this Database encryption can occur within the application or at the database To only encrypt certain columns is more expensive (more code) How do you know what to encrypt? What about aggregated information? Do you trust your DBA s more than System Administrators? 16
17 Encryption Won t Always Help Many attacks are now conducted through the application The application must have access to the data Most attacks are successful because of improper input validation (they don t properly check what the user is putting in the form) Many attacks are successful because unnecessary services were running or certain services were not properly patched or configured Allowing administrative services to be accessible from the Internet is also a common cause for breaches 17
18 Example Rhode Island The information was encrypted in the database and SSL was used for connections Improper input validation let the hacker display files containing server user names and hashed passwords Many tools are available to unhash the passwords This type of issue is usually either a patch or configuration issue. Most IPS systems will detect this type of attack if they can read the traffic. An unprotected (outside of VPN access) SSH (Secure Shell) service was available from the Internet - the hacker just logged in with an account and password The hacker spooled information from the database to a file He was outside of the application, so the data was strongly encrypted He had access to the keys, so he downloaded them Since encryption methods are standard, he downloaded an encryption kit for the type of encryption used and decrypted the data Proper monitoring would have caught access to the keys 18
19 How do you protect your information? A good foundation of policies and procedures Follow established standards FISMA PCI GBLA DO NOT make up your own encryption standard Perform proper monitoring Encrypt what is necessary Perform audits to ensure processes work and are being followed Perform testing Have a third-party evaluate your program 19
20
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