A Review of Advancements in Code Breaking and Password Recovery Technology
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1 A Review of Advancements in Code Breaking and Password Recovery Technology
2 Code Breaking and Digital Forensics FBI Supervisory Special Agent Chris Beeson Laboratory Director Silicon Valley Regional Computer Forensic Laboratory Menlo Park, CA
3 Course Content Basic concepts in Cryptography Keyspace Dilemma PRTK Rainbow Tables Other Code breaking tools
4 What is Cryptography Cryptography: The art and science of keeping messages/information secure Encryption: Transformation of data into unreadable form Decryption: Reverse of encryption Applied Cryptography 2 nd Addition Bruce Schneier / RSA Laboratories FAQs about Cryptography Version
5 Types of Encryption Access Protection Not encrypted, just locked Data obfuscation Encryption by way of scrambling (ROT13) Trillian XOR Data encryption Crypto systems
6 Password States Not stored Application uses authentication sequence to verify (ie Word/Excel) Stored by User Application offers to store, then obfuscate or encrypt (IE, Yahoo, Netscape) Stored by Application EFS
7 Password Types Open/Modify Passwords (Word/Excel) Unlock No encrypt, needed to open file (early Quicken) User/Master (PDF) Administrator Password archives PasswordSafe, PasswordsPlus, etc
8 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
9 Hash Hash Function Variable length data stream = fixed length number Must be reproducible with same data Cannot be reversed (number back to original data) Also called Message Digests (ie md5)
10 What is a Hash Function? WINDOWS LOGON CAT MD4 / SHA = A2D3C1AE4FD2EAC213DE45FA2DEC2AE2
11 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
12 Salt Salt is used to make a passkey unique for each user/machine Salt is normally published and is not secret Salt is rarely more than a couple of bytes in size Two Users Same Password - Without - Salt: User 1 cat = f3fca383b05f665ff43244ecdecfe959 User 2 cat = ccd15a3c85d28019fb3ef173f7ff344a f3fca383b05f665ff43244ecdecfe959
13 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
14 File Encryption Key + SALT + = 9o2GrDE398fD7ipR3 You get the idea!
15 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
16 Keyspace Values Key: Any One of a Larger Number of Values Keyspace: Range of Possible Values (this can get big!) 20 1,048, ,073,741, ,294,967, ,589,934, ,099,511,627, ,125,899,906,842, ,057,594,037,927, ,152,921,504,606,850, ,180,591,620,717,410,000, ,208,925,819,614,630,000,000, ,237,940,039,285,380,000,000,000, ,267,650,600,228,230,000,000,000,000, ,298,074,214,633,710,000,000,000,000,000, ,329,227,995,784,920,000,000,000,000,000,000, ,282,366,920,938,000,000,000,000,000,000,000, ,461,501,637,330,900,000,000,000,000,000,000,000,000,000,000,000
17 Keyspace Key Space Calculation Spreadsheet Key Space (# of bits) 40 Size of Key Space 1,099,511,627,776 Keys Tested Per Second 500,000 # of Machines 1 Time (in seconds) 2,199,023 Time (in hours) Time (in days) Time (in years) 0.070
18 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
19 Array An Array is used by cryptographic systems to generate bit streams used to encrypt and decrypt data. A random bit is used with a Exclusive Or (XOR) algorithm that switches the bits that comprise the data.
20 Terminology Function Salt FEK Keyspace Array Plain Text Cipher Text
21 Plain Text Cipher Text (array value) PT ^ array value = CT
22 Crypto System Password 40 bit MD5 Hash, SHA Hash?? FEK 40 bit MD5 Hash, SHA Hash?? RC ^ PT
23 The Key Space and Password Space Dilemma
24 Code Breaking Tools
25 Password Cracking Ability to recover passwords from well-known applications Decrypt files, folders, and hard drives Gain access to files protected by the Microsoft Encrypted File System (EFS)
26 Distributed Code Breaking Ability to recover passwords and/or keys using: Brute-Force attacks - Key-Space attacks - Pass-phrase attacks One system manages many Clients Distributed code breaking to many clients Apple Macintosh Linux UNIX Windows Uses 'Idle Process' time
27 Attacking the RC4 Implementation in MS Office
28 Microsoft Office 40-bit Encryption Due to U.S. Export laws, MS Office 97 and later versions use 40-bit FEK to initialize RC4 symmetric encryption algorithm. An exhaustive key space attack of a 40-bit key using a 25 computer distributed network attack (DNA) takes 24+ hours
29 MS Word 40 bit Encryption
30 MS Word Advanced Encryption Option
31 Code Breaking Tools AccessData Password Recovery Tool Kit (PRTK) Distributed Network Attack (DNA)
32 PRTK Overview
33 Some up front knowledge might make a difference!! Recovery Modules
34
35 Working Smarter rather than Harder!
36 Dictionary Attacks User Created Inside/Outside PRTK Dictionaries Common Common English words Passwords Password lists (golden dictionary) Crime Sex and drugs Misc Keyboard combinations Names Common names General Webster like Unicode
37 Dictionary Creation Select Dictionary to Import Import Dictionaries Utility
38 What is a Level? Level Technology PRTK/DNA Primary Dictionary Search rabbit Prefixes RABBIT Postfixes Rabbit rabbit Word in a Word 1abduct Concatenation Toabduct Markov abduct123 Reverse
39 Starting a Job OR FIX.DOC D R DRAG O P PRTK
40 Starting a Job PRTK Drop file into PRTK
41 Decryption Steps
42 Basic File and Status Information Properties Information o o o o o o o o o o File Name / Path Application Type Version Size Dates Hashes Attack Type Profile in use Status Time Begin / End
43 Documenting Results PRTK Written Reports Electronic Reports
44 Documenting Results PRTK
45 Rainbow Tables
46 Code Breaking Lookup Tables and Rainbow Table Technology Use pre-generated cipher text file encryption key lookup tables to derive the key that will open 40-bit encrypted MS-Excel and MS-Word files. Recovery time is on the order of 1-5 minutes per file regardless of the password Able to provide the users login LAN and Windows NT passwords (i.e. attacking the hashes in the SAM file)
47
48 Attacking 128-bit Cryptosystems BestCrypt, WinZip (AES), WinRAR, PGP, DriveCrypt, etc. Keyspace is to large for lookup tables to be an option Only option is to guess the user s password Biographical Profiling Options NTUSER.DAT File Web Crawling FTK Export Word List The sweet spot for password lengths are 7-10 characters. The more resources that can be dedicated to the problem the higher probably of success
49 Other Tools John the Ripper Primarily a user authentication password cracker (logon) Unix, Windows LAN hash LC5 L0phtcrack = Symantec NLA
50 Questions?
51 Code Breaking and Digital Forensics FBI Supervisory Special Agent Chris Beeson Laboratory Director Silicon Valley Regional Computer Forensic Laboratory Menlo Park, CA
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