PPT-Hash Tables

Comp 550 Dictionary Dictionary Dynamicset data structure for storing items indexed using keys Supports operations Insert Search and Delete take O 1 time Applications. Spencer Dawson. Summary. What are rainbow tables?. A time and memory tradeoff in password cracking.. A piecewise approach to one-way hashes. What are the advantages/disadvantages. Best uses. Limitations. Motivating Applications. Large collection of datasets. Datasets are dynamic (insert, delete). Goal: efficient searching/insertion/deletion. Hashing is ONLY applicable for exact-match searching. Direct Address Tables. By. Lucia Cárdenas . INGREDIENTS. 2 pork chorizo links. 1 ripe (fairly but not all black) plantain, peeled and diced. 1 can . Delmonte. Summer Crisp or 1 cup fresh corn. 1/2 cup(s) black beans, drained and rinsed. Linear Probing. Uri Zwick. Tel Aviv University. Hashing with open addressing. “Uniform probing”. Insert key . in the first free position among.  . (Sometimes) assumed to be a . permutation. To search, follow the same order. Passwords stored in computers are changed from their plain text form to an encrypted value.. These values are called hashes, and there is a unique plain text value for every hash.. 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 . Dominique Unruh. University of Tartu. Surprises with hash functions. Consider a hash function and a horse race. “Spicy Spirit” wins…. Commitments and hashes. Player. Bookie.  . Player. Bookie. CIS 606. Spring 2010. Hash tables. Many applications require a dynamic set that supports only the . dictionary . operations . INSERT. , SEARCH, and DELETE. Example: a symbol table in a compiler.. A hash table is effective for implementing a dictionary.. Hash Tables. . . 0. 1. 2. 3. 4. 451-229-0004. 981-101-0002. 025-612-0001. © 2014 Goodrich, Tamassia, Godlwasser. Presentation for use with the textbook . Data Structures and Algorithms in Java, 6. . Outline. Discuss what a hash method does. translates a string key into an integer . Discuss a few strategies for implementing a hash table. linear probing. quadratic probing. separate chaining hashing. n. . . [from the . techspeak. ] (var. ‘hash clash’) . When used of people, signifies a confusion in associative memory or imagination, especially a persistent one.” . . -. The Hacker's Dictionary . Hash functions. (Cryptographic) hash function: deterministic function mapping arbitrary length inputs to a short, fixed-length output (sometimes called a . digest. ). Hash functions can be . keyed. or . Uri Zwick. Tel Aviv University. Started: . April . 2015. Last update: . January 12, 2017. Hashing with open addressing. “Uniform probing”. Insert key . in the first free position among.  . (Sometimes) assumed to be a . Pass-The-Hash: Gaining Root Access to Your Network June 24, 2014 Tim Slaybaugh Cyber Incident Analyst Northrop Grumman Information Systems What is Pass-The-Hash? “Attackers using PtH completely compromise just about every network they hit. Pretty much every APT attack team uses them.” Colspan. , . Rowspan. Svetlin Nakov. Technical Trainer. www.nakov.com. Software University. http://softuni.bg. 2. HTML Tables. Simple Tables. Complete HTML Tables. Data, Header and Footer Cells. Nested Tables.