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# Big Encryption on a Small Budget - PowerPoint PPT Presentation

Big Encryption on a Small Budget. Beth E. Binde Harold W. Winshel. Agenda. Definition of encryption Need for encryption Drawbacks to encryption Criteria for product selection Encryption demonstration. What is encryption?. Coding a message to conceal meaning

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### Big Encryption on a Small Budget

Beth E. Binde

Harold W. Winshel

• Definition of encryption

• Need for encryption

• Drawbacks to encryption

• Criteria for product selection

• Encryption demonstration

• Coding a message to conceal meaning

• Reduces impact of eavesdropping

• Helps protect Data At Rest

• Apply the encryption key: 1010011 1010010 1001110

• To the plain text message CAT: 1000011 1000001 1010100

• XOR operation

• 0 if the same

• 1 if different

• The elements of the key correspond to letters:

• 1010011 = S

• 1010010 = R

• 1001110 = N

1000011 1000001 1010100

⊕ 1010011 1010010 1001110

====== ====== =======

0010000 0010011 0011010 ← Cipher text

• These binary strings correspond to ASCII control characters. They aren’t even printable!

• Results of string lookup:

• Data Link Escape → 0010000

• Device Control 3 → 0010011

• Substitute → 0011010

• Ciphertext: 0010000 0010011 0011010

• Key: 1010011 1010010 1001110

• Apply XOR operation

• Original: 1000011 1000001 1010100

• Don’t trust a secret or proprietary algorithm or roll your own

• Public scrutiny by multiple experts finds the flaws

• Public scrutiny beneficial

• Protect keys

• Keys essential for decryption

• Even knowing the algorithm is not sufficient

• Don’t rely on any single technology or measure for security

• Protect confidential data

• Non-public personal information (NPPI)

• Intellectual property

• Regulatory requirements

• A Chronology of Breaches http://www.privacyrights.org/ar/ChronDataBreaches.htm

• 28,600,000 records of American military veterans discharged since 1975 (SSN’s, names, dates of birth, etc.) on a laptop computer stolen from a VA’s ee’s home on May 22, 2006.

• 60,000 current and former employees of Starbucks on four Starbucks laptop computers that were lost. Contained employee’s names, addresses and SSN’s (Nov 3, 2006).

• 48,000 records of American military veterans that might contain SSN’s on a portable hard drive stolen or missing, from VA Medical Center in Birmingham, AL (Feb 2, 2007).

“… notification is required if there is reasonable belief that data were acquired by an unauthorized individual.” (Steve Schuster / Tracy Mitrano, Cornell)

Is the information is in the physical possession and control of an unauthorized person, such as a lost or stolen computer or other device containing unencrypted notice-triggering information? (Cal State Northridge).

• Cost of purchase

• Time

• Product evaluation and testing

• Installation and maintenance

• Staff training

• User education

• Loss of data due to corruption of encrypted disks

• Possible lock out due to forgotten passwords

Pay now

… or pay later

Data at rest

Data in transit

Data in process

• The more factors the better

• One-factor authentication

• Two-factor authentication

• Three-factor authentication

• Purchase cost of the product

• Size of current user base

• Open source?

• Availability of support

• Ease of administration for IT staff

• Ease of use for end users

• What happens when things go wrong.

• Ability to support two-factor authentication.

• Full disk encryption vs. file / folder encryption.

• Keyserver vs. standalone products.

• Support of portable media (flash drives, zip drives, CD’s, etc.)

• Not linked to hardware of a specific manufacturer

• Large user base

• Great support

• Very well received / good reviews

• Free

• File / folder

• Supports two factor authentication.

• Supports multiple operating systems.

• Encrypts portable media.

• Truecrypt volumes:

• File-hosted volumes (aka Container volume)

• Device hosted volumes (partition).

• Truecrypt won’t encrypt existing files.

• Encrypting an existing file will overwrite that file.

• Password is entered once to decrypt a volume.

• Truecrypt never saves decrypted data to a disk.

• Decrypted data temporarily stored in ram.

• Even when volume is mounted, data on disk still encrypted.

• Password is entered once to decrypt a volume.

• Travelor mode.

• Date / time stamp of the file.

• Create a Truecrypt volume.

• Mount a Truecrypt volume.

• Copy files to / from a Truecrypt volume.

• Dismount a Truecrypt volume.

• File / folder

• Interface a little clunky.

• Windows recognition of the Truecrypt volume when it is not mounted.

• Escalation of privileges by local users

• Applies to Linux implementation

• Reported March 28, 2007

• Must be running TrueCrypt as setuid root

• Exploit available

• Which features were typical to many products

• Which features were considered positive

• Which features where considered negative

Some Ot It?her Encryption Products We Looked At.

• Encryption utilities on flash drives.

• Axcrypt

• Cryptainer

• SafeEnd

• Windows EFS

• Windows Vista Bitlocker

• Pointsec

• Safeboot

• Authenix

• PGP

• Get senior administration support for policies to protect data

• Don’t store sensitive data if you don’t have to

• Use utilities to find files with sensitive data

• Require encryption for sensitive data

Conclusion It?

• What is encryption?

• Why do you need it?

• Encryption as part of an overall security posture