PPT-Secured Hash Algorithm(SHA)

By Debanjan Sadhya iwc2011013 Mayank Swarnkar iwc2011026 Contents Introduction Definition Properties of SHA SHA Functions SHA Constants Preprocessing in SHA Hashing in SHA. Exploiting the Entropy. in a Data Stream. Michael Mitzenmacher. Salil Vadhan. How Collaborations Arise…. At a talk on Bloom filters – a hash-based data structure.. Salil: Your analysis assumes perfectly random hash functions. What do you use in your experiments?. Lecture 3. Sets. A . set. is simply a collection of elements. Unlike lists, elements are not ordered. Very abstract, general concept with broad usefulness:. The set of all Google search queries from the past 24 hours. Comp 550. Dictionary . Dictionary:. Dynamic-set data structure for . storing items indexed using . keys. .. Supports . operations: Insert, Search, and . Delete . (. take . O. (1) time. ). .. Applications:. Message Authentication Codes. Sebastiaan. de Hoogh, . TU/e. Cryptography 1. September 12, 2013. Announcements. Until this morning 50 students handed in 43 pieces of . homeworks. . (only 7 pairs). BUT: . Christian Rechberger, KU Leuven. Fundamental questions in CS theory. Do oneway functions exist?. Do collision-intractable functions exist?. We don't know.. Do we care?. What we care about: computational properties. 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. SHA and HMAC. SHA stands for Secure Hash Algorithm. It is based off the . Merkle-Dangard. . hash function. There are 3 versions of it with one coming in 2012. SHA-0. SHA-1. SHA-2. SHA-3 (coming soon). Hash Functions. Cryptoprotocols, TLS. November . 4. th. , . 2015. Valdo Praust.  . mois. @. mois. .ee. Lecture Course in Estonian IT College. Autumn . 2015.  .   . Main Types of Cryptoalgorithms. 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. A network LAN can be secured through:. Device hardening. AAA access control. Firewall features. IPS . implementations. How is network traffic protected when traversing the public Internet? . Using cryptographic . 2-Unfolded SHA-1 Computation. 2-Unfolded SHA-1 Computation. Pre-Computation + 2-Unfolding. Pre-Computation + 2-Unfolding. Reference. Implementation of high-speed SHA-1 architecture. Lee et al. IEICE 2009.. Cyryptocurrency Project Proposal - Spring 2015. SHA Use in Bitcoin. SHA256 used heavily as bitcoin’s underlying cryptographic hashing function. Two examples (of many) are its use in the Merkle tree hash, as well as the proof of work calculation. Cryptography Lecture 13 Hash functions Hash functions (Cryptographic) hash function: deterministic function mapping arbitrary length inputs to a short, fixed-length output Hash functions can be keyed                   !       "# $ %