Password Cracking With Rainbow Tables

Slides:

Advertisements

Similar presentations

By Wild King. Generally speaking, a rainbow table is a lookup table which is used to recover the plain-text password that derives from a hashing or cryptographic.

Advertisements

Cryptanalysis of a Communication-Efficient Three-Party Password Authenticated Key Exchange Protocol Source: Information Sciences in review Presenter: Tsuei-Hung.

Use of a One-Way Hash without a Salt

Lee Jae-song 1.  How to cryptanalysis DES?  C = E K (P)  E is DES encryption funtion  K is a key, 56-bit.  P is a plaintext, C is a ciphertext, both.

Secure Password Storage JOSHUA SMALL LHNSKEYHTTPS://GITHUB.COM/TECHNION/ LHNSKEY - ROOT PASSWORD GENERATOR FOR CVE

CMSC 414 Computer and Network Security Lecture 12 Jonathan Katz.

Introduction to Cryptography and Security Mechanisms: Unit 5 Theoretical v Practical Security Dr Keith Martin McCrea

Announcements: Get your ch 1-2 quiz if you haven’t. Get your ch 1-2 quiz if you haven’t. Grading change: Grading change: Homeworks are mixed programming.

1 Overview of the DES A block cipher: –encrypts blocks of 64 bits using a 64 bit key –outputs 64 bits of ciphertext A product cipher –basic unit is the.

What are Rainbow Tables? Passwords stored in computers are changed from their plain text form to an encrypted value. These values are called hashes, and.

Authentication for Humans Rachna Dhamija SIMS, UC Berkeley DIMACS Workshop on Usable Privacy and Security Software July 7, 2004.

Cryptanalysis. The Speaker  Chuck Easttom  

Nothing is Safe 1. Overview  Why Passwords?  Current Events  Password Security & Cracking  Tools  Demonstrations Linux GPU Windows  Conclusions.

MS systems use one of the following: LanManager Hash (LM) LanManager Hash (LM) NT LanManager (NTLM) NT LanManager (NTLM) Cached passwords Cached passwords.

Hellman’s TMTO 1 Hellman’s TMTO Attack. Hellman’s TMTO 2 Popcnt  Before we consider Hellman’s attack, consider simpler Time-Memory Trade-Off  “Population.

Security and Protection of Information, Brno Using quasigroups for secure encoding of file system Eliška Ochodková, Václav Snášel

Windows This presentation is an amalgam of presentations by Mark Michael, Randy Marchany and Ed Skoudis. I have edited and added material. Dr. Stephen.

Work, Power and Simple Machines.

Time-Memory tradeoffs in password cracking 1. Basic Attacks Dictionary attack: –What if password is chosen well? Brute Force (online version): –Try all.

CIS 450 – Network Security Chapter 8 – Password Security.

CHAPTER 09 Compiled by: Dr. Mohammad Omar Alhawarat Sorting & Searching.

Mark Shtern. Passwords are the most common authentication method They are inherently insecure.

Advanced Algorithm Design and Analysis (Lecture 3) SW5 fall 2004 Simonas Šaltenis E1-215b

Somewhere Over the Rainbow Tables Bob Weiss Password Crackers, Inc.

The Misuse of RC4 in Microsoft Office A paper by: Hongjun Wu Institute for Infocomm Research, Singapore ECE 578 Matthew Fleming.

Honey Encryption: Security Beyond the Brute-Force Bound

RADIUS Shared Secret Security Amplification A practical approach to improved security draft-funk-radiusext-shared-secret-amp-00.txt.

A New Time-Memory-Resource Trade-Off Method for Password Recovery Communications and Intelligence Information Security (ICCIIS), 2010 International Conference.

Password authentication Basic idea –User has a secret password –System checks password to authenticate user Issues –How is password stored? –How does system.

Exercises Information Security Course Eric Laermans – Tom Dhaene.

TE/CS 536 Network Security Spring 2005 – Lecture 8 Security of symmetric algorithms.

Security. Security Flaws Errors that can be exploited by attackers Constantly exploited.

Mitch Parks, GSEC/GCWN ITS Desktop Security Analyst

How Safe are They?. Overview Passwords Cracking Attack Avenues On-line Off-line Counter Measures.

Attacks Overview Nguyen Cao Dat 1. BK TP.HCM Outline  Cryptographic Attacks ▫ Frequency analysis ▫ Brute force attack ▫ Meet-in-the-middle attack ▫ Birthday.

Design and Analysis of Algorithms - Chapter 71 Space-time tradeoffs For many problems some extra space really pays off: b extra space in tables (breathing.

CNIT 124: Advanced Ethical Hacking Ch 9: Password Attacks.

Presented by Sharan Dhanala

COMP9321 Web Application Engineering Semester 2, 2015 Dr. Amin Beheshti Service Oriented Computing Group, CSE, UNSW Australia Week 9 1COMP9321, 15s2, Week.

Plaintextciphertext encryption algorithmdecryption algorithm plaintext.

Operating Systems Security

Distributed Computing Projects. Find cures for diseases like Alzheimer's and Parkinson's by analyzing the ways proteins develop (protein.

Module 4 Password Cracking

Lecture 5 Page 1 CS 236 Online More on Cryptography CS 236 On-Line MS Program Networks and Systems Security Peter Reiher.

Operating Systems Security 1. The Boot Sequence The action of loading an operating system into memory from a powered-off state is known as booting or.

 Encryption provides confidentiality  Information is unreadable to anyone without knowledge of the key  Hashing provides integrity  Verify the integrity.

CAPTCHA AS GRAPHICAL PASSWORDS—A NEW SECURITY PRIMITIVE BASED ON HARD AI PROBLEMS ASHWINI B.

FERPA & Data Security:FERPA & Data Security: Passwords and Authenticators.

MIGHTY CRACKER Chris Bugg Chris Hamm Jon Wright Nick Baum We could consider using the Mighty Cracker Logo located in the Network Folder.

Computer Security: Problem

I have edited and added material.

How to: Register and Login

Passwords Everywhere Ing. Ondřej Ševeček | GOPAS a.s. |

Authentication CSE 465 – Information Assurance Fall 2017 Adam Doupé

Outline Desirable characteristics of ciphers Uses of cryptography

Outline Desirable characteristics of ciphers Uses of cryptography

Information Assurance Day Course

CS 465 PasswordS Last Updated: Nov 7, 2017.

Kiran Subramanyam Password Cracking 1.

Authentication CSE 365 – Information Assurance Fall 2018 Adam Doupé

Elections Choose wisely, this is your chance to prove if election by popular vote works or not.

Exercise: Hashing, Password security, And File Integrity

From Passwords to Public keys Chapter 4 ~ Chapter 6

From Passwords to Public keys Chapter 10 ~ Chapter 12

Elijah Hursey & Austin Keener Academy of Science Summer Bridge 2013

Network Penetration Testing & Defense

Proofs of Space 徐昊 2017/5/31.

Key Question: What is a simple machine?

Authentication CSE 365 – Information Assurance Fall 2019 Adam Doupé

Presentation transcript:

Password Cracking With Rainbow Tables Spencer Dawson

Summary What are rainbow tables? What are the advantages/disadvantages A time and memory tradeoff in password cracking. A piecewise approach to one-way hashes What are the advantages/disadvantages Best uses Limitations How to use rainbow tables.

What are rainbow tables? A rainbow table is a lookup table offering a time-memory tradeoff used in recovering the plaintext password from a password hash generated by a hash function Approach invented by Martin Hellman The concept behind rainbow tables is simple Make one-way hash functions two way by making a list of outputs for all possible inputs up to a character limit

What are the limitations? Rainbow Tables are Large A rainbow table set for windows NTHASH exactly 8 characters including only 0-10, a-z, A-Z, and the symbols !* is 134.6GB 9+ character rainbow tables can take up terabytes of space. Generating rainbow tables requires more time than a brute force attack Always “worst case” time complexity. Requires access to the password hash Salting passwords can make the approach unfeasable

Hash Table Advantages Rainbow Tables are built once, and used many times Fast Password lookups become a table search problem The brute force work is pre-computed Perfect for cracking weak hashes Windows LM hashes of 14 characters or less can be cracked with trivial effort Any non salting password hash can be cracked easily

Examples Rainbow table cracking online http://lmcrack.com/

QUESTIONS?