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CAS CS538: Cryptography. Spring 2023 Instructor: , Ran Canetti A note on secure communication schemes March 3, 2023 We define secure message transmission schemes. These are schemes that allow parties to communicate while guaranteeing both secrecy and authenticity of the communicated plaintexts. That is, we consider a setting where one party (Alice) is tasked to

CAS CS538: Cryptography. Spring 2023 Instructor: , Ran Canetti Equivalence between Shannon and semantic secrecy of perfect encryption schemes February 17, 2023 This note proves the equivalence between the semantic formulation and the Shannon formulation of perfectly secure encryption schemes. Copyright By PowCoder代写 加微信 powcoder Recall the definitions: Definition 1 (Correctness). An encryption scheme (Enc,Dec)

0368.4162: Introduction to Cryptography Ran Canetti Lecture 8: Digital Signatures 28 December 2008 We would like that a person A would be able to generate message-signature pairs (m, t) such that everyone could verify that the message indeed originated from A, and additionally no verifier will be able to generate pairs (m′ , t′ )

Theoretical Computer Science 777 (2019) 155–183 Contents lists available at ScienceDirect Theoretical Computer Science www.elsevier.com/locate/tcs Algorand: A secure and efficient distributed ledger ✩ a,∗, b a Computer Science Department, Stony Brook University, Stony Brook, NY 11794, USA b CSAIL, MIT, Cambridge, MA 02139, USA Copyright By PowCoder代写 加微信 powcoder article info Article history: Received 15

Lecture 3 Cryptography Recall … Cryptographic hash function Merkle tree Digital signature A blockchain is a linked list with hash pointers. Copyright By PowCoder代写 加微信 powcoder prev: H( ) prev: H( ) prev: H( ) Cryptographic hash function • A hash function is a function that o takesanystringasinput, o has fixed-size output (we’ll use 256