Chapter 8. Public Key Encryption

Sep 01, 2012

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Types of Attacks. Chosen plaintext attackChosen ciphertext attackadversary selects ciphertext, and obtains the corresponding plaintextthe adversary is provided with decryptions of any ciphertexts of its choice, but these must be chosen prior to receiving the targetAdaptive chosen-ciphertext atta

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Chapter 8. Public Key Encryption

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1. Chapter 8.Public Key Encryption Yongdae Kim February 26, 2002

Public Key Encryption Systems

Public Key Encryption Systems. The encrypter and decrypter have different keys C = E(K E ,P) P = D(K D ,C) Often, works the other way, too. History of Public Key Cryptography. Invented by Diffie and Hellman in 1976 Merkle and Hellman developed Knapsack algorithm in 1978

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Public Key Encryption

Public Key Encryption. Dan Fleck CS 469: Security Engineering. 1. 1. These slides are modified with permission from Bill Young ( Univ of Texas). Public Key Encryption.

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Public Key Encryption 3

Public Key Encryption 3. Digital Signatures or The Box within a Box. Ken Coder sends Dee a secret message only she can unlock. It could have come from Pre Tender!. Yves Dropper's evil cousin. Ken's idea: Lock with my private key. Unlock with my public key: Only I could have sent it!.

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Public Key Encryption and the RSA Public Key Algorithm

Public Key Encryption and the RSA Public Key Algorithm. CSIS 5857: Encoding and Encryption . Public Key Encryption. Recipient (Alice) generates key pair : Public key k PU Does not have to be kept secret Distributed to all senders (such as Bob) Private key k PR Kept secret by Alice. +.

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Anonymity-preserving Public-Key Encryption

Anonymity-preserving Public-Key Encryption. Markulf Kohlweiss Ueli Maurer, Cristina Onete, Björn Tackmann, and Daniele Venturi PETS 2013. Context: E ncryption and Anonymity. Public-key encryption Short but eventful history, late 70s, 80s.

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ElGamal Public Key Encryption

ElGamal Public Key Encryption. CSIS 5857: Encoding and Encryption. ElGamal Public Key Encryption. Structure similar to RSA (discrete logs ) Component of many secure systems Digital Signature Standard (DSS) S/MIME (Email). Components of ElGamal. Components: Large prime q

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Public-key encryption

Online Cryptography Course Dan Boneh. Basic key exchange. Public-key encryption. Establishing a shared secret. Goal : Alice and Bob want shared secret, unknown to eavesdropper For now: security against eavesdropping only (no tampering). Alice.

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RSA Public-Key Encryption

RSA Public-Key Encryption. Description Problem Solution Rafael Roque. RSA. R. R ivest, A. S hamir, and L. A dleman The most widely used public-key cryptosystem Provide both secrecy and digital signatures

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Public Key Encryption

CS461/ECE422 Spring 2012. Public Key Encryption. Reading Material. Text Chapters 2 and 21 Handbook of Applied Cryptography, Chapter 8 http://www.cacr.math.uwaterloo.ca/hac/. Symmetric keys & Distribution. Every pair of people must share a secret key E.g.: Alice, Bob, Carol, David:

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Public-key encryption

Public-key encryption. Symmetric-key encryption. Invertible function Security depends on the shared secret – a particular key. Fast, highly secure Fine for repeated communication Poor fit for one-shot communication, signatures. Asymmetric-key (public key) encryption. The basic idea:

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Public-key Encryption

Public-key Encryption. plaintext. plaintext. ciphertext. encryption algorithm. decryption algorithm. Problems with symmetric (private-key) encryption. 1) secure distribution of keys. 2) large number of keys. Solution to both problems: Public-key (asymmetric) encryption. key pub.

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Public Key Encryption

Bronson Jastrow. Public Key Encryption. Outline. What is cryptography? Symmetric Key Cryptography Public Key Cryptography How Public Key Cryptography Works Authenticating sources Hybrid Cryptosystems Perfect Forward Secrecy Attacks on Public Key Systems. What is Cryptography?.

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ElGamal Public Key Encryption

ElGamal Public Key Encryption. CSIS 5857: Encoding and Encryption. ElGamal Public Key Encryption. Public key encryption algorithm Structure similar to Diffie-Hellman (discrete logs) Component of many secure systems Digital Signature Standard (DSS) S/MIME (Email). Components of ElGamal.

426 views • 11 slides

RSA Public Key Encryption Algorithm

RSA Public Key Encryption Algorithm. The best known public key cryptosystem is RSA - named after its authors, Rivest, Shamir and Adelman. Secret Key Cryptography Problems. Traditional (secret key) cryptography uses a single key shared by both sender and receiver. This has some drawbacks:

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RSA Public Key Encryption Algorithm

Key Generation Select p , q p and q both prime Calculate n n = p × q Select integer d gcd ( ( n ), d ) = 1; 1 < d < ( n ) Calculate e e = d -1 mod ( n ) Public Key KU = { e , n } Private Key KR = { d , n }. Encryption Plaintext: M < n

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Public Key Encryption

Public Key Encryption. Terminology RSA Hash functions. Reading Assignment. Reading assignments for current lecture: Required: Pfleeger: 2.7, …, 2.12 Recommended :

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Introduction to Public Key Encryption

Introduction to Public Key Encryption. CSIS 5857: Encoding and Encryption. Public Key Encryption. +. Recipient (Alice) generates key pair : Public key k PU Does not have to be kept secret Distributed to all senders (such as Bob) Private key k PR Kept secret by Alice.

380 views • 22 slides

Public Key Encryption

Public Key Encryption. Terminology RSA Hash functions. Reading Assignment. Reading assignments for current lecture: Required: Pfleeger: 2.7, …, 2.12 Recommended :

484 views • 43 slides

RSA Public Key Encryption Algorithm

478 views • 43 slides

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