PPT-Practical Aspects of Modern Cryptography

Josh Benaloh Tolga Acar Fall 2016 October 25 2016 2 The wiretap channel Key K 1 Key K 2 Eavesdropper Plaintext P Noisy insecure channel Encrypt Decrypt Alice Bob Plaintext. However computational aspects of lattices were not investigated much until the early 1980s when they were successfully employed for breaking several proposed cryptosystems among many other applications It was not until the late 1990s that lattices w of . Modern Cryptography. Josh Benaloh. Brian . LaMacchia. Winter 2011. Side-Channel Attacks. Breaking a cryptosystem is a frontal attack, but there may be easier access though a side or back door – especially on embedded cryptographic devices such as . of . Modern Cryptography. Josh Benaloh. Brian . LaMacchia. Winter 2011. Agenda. Guest lecture. Final project presentation logistics. The Politics of Crypto. Export Controls. Key Escrow. The Clipper Chip. of . Modern Cryptography. Josh Benaloh. Brian . LaMacchia. Winter 2011. Agenda. Integrity Checking (HMAC . redux. ). Protocols (Part 1 – Session-based protocols). Introduction. Kerberos. SSL/TLS. of . Modern Cryptography. Josh Benaloh. Brian . LaMacchia. Winter 2011. Some Tools We’ve Developed. Homomorphic Encryption. Secret . Sharing. Verifiable Secret Sharing. Threshold Encryption. of . Modern Cryptography. Josh Benaloh. Brian . LaMacchia. Winter 2011. January 6, 2011. Practical Aspects of Modern Cryptography. Cryptography is .... Protecting Privacy of Data. Authentication of Identities. Josh Benaloh. Tolga Acar. Fall 2016. November 8, 2016. Practical Aspects of Modern Cryptography. 1. What is Money?. 106 billion people lived. 94% are dead. Most of the world’s wealth made after 1800. Problem 1. Each participant . selects a random polynomial. The joint secret is the sum of the original secrets. How are shares of the joint secret formed?.  . 3/10/2011. Practical Aspects of Modern Cryptography. Maps from Lattices. Craig Gentry (IBM. ). Sergey . Gorbunov. (. MIT). Shai Halevi (IBM). https. ://eprint.iacr.org/2014/645. July 10, 2015. The Mathematics of Modern Cryptography. Multilinear Maps (MMAPs). 1. Administrative Note. Professor Blocki is traveling and will be back on Wednesday. . E-mail: . jblocki@purdue.edu. . Thanks to Professor Spafford for covering the first lecture!. 2. https://www.cs.purdue.edu/homes/jblocki/courses/555_Spring17/index.html. Josh Benaloh. Tolga Acar. Fall 2016. October 25, 2016. 2. The wiretap channel. Key (K. 1. ). Key (K. 2. ). Eavesdropper. Plaintext. (P). Noisy insecure. channel. Encrypt. Decrypt. Alice. Bob. Plaintext. Crypto is amazing. Can do things that initially seem impossible. Crypto is important. It impacts each of us every day. Crypto is fun!. Deep theory. Attackers’ mindset. Necessary administrative stuff. CA Ashok . Batra. A. K. . Batra. & Associates, New Delhi. 1/29/2021. AK Batra & Associates. 1. PRACTICAL ASPECTS IN GST ASSESSMENTS. 1/29/2021. AK Batra & Associates. 2. “. Assessment” clause 2(11).