PDF-Cryptosystems Provably Secure against Chosen Ciphertext Attacks ...

Naor IBM Research Almaden Research Center 650 Harry Road SanJose CA 95120 Moti Yung IBM Research TJ Watson Research Center Yorktown Heights NY 10598 extended abstract show how to construct. Murray Hill NJ 07974 bleichenresearchbelllabscom Abstract This paper introduces a new adaptive chosen ciphertext at tack against certain protocols based on RSA We show that an RSA privatekey operation can be performed if the attacker has access to a ethzch Victor Shoup IBM Zurich Research Laboratory Saumerstr 4 8803 Ruschlikon Switzerland shozurichibmcom May 1998 Abstract A new public key cryptosystem is proposed and analyzed The scheme is quite practical and is provably secure against adaptive Hofheinzkitedu RuhrUniversitat Bochum Germany eikekiltzrubde Courant Institute New York University USA shoupcsnyuedu Abstract We propose a practical publickey encryption scheme whose security against chosenciphertext attacks can be reduced in the sta csailmitedu Calvin Newport MIT CSAIL cnewporttheorycsailmitedu ABSTRACT In ciphertext policy attributebased encryption CPABE every secret key is associated with a set of attributes and every ciphertext is associated with an access structure on attrib Chosen . ciphertext. attacks. Online Cryptography Course Dan Boneh. Example chosen . ciphertext. attacks. A. dversary has . ciphertext. c that it wants to decrypt. ~Ksenia Potapov. ~Amariah Condon. ~Janette Fong. ~Janice Lau. Cryptography. Definition – . JANETTe. Cryptography is the study of techniques for secure communication in the presence of third parties.. Core Concepts. Dr. Kerry A. McKay. 1. Approved for Public Release. Distribution Unlimited 13-1379. All materials is licensed under a Creative Commons . “. Share Alike. ”. license.. http://creativecommons.org/licenses/by-sa/3.0/. from trapdoor permutations. PKCS 1. Online Cryptography Course Dan Boneh. RSA encryption in practice. Never use textbook RSA.. RSA . in . practice . (since ISO standard is not often used) . Cryptanalysis . 2. Block Cipher – Attack Scenarios. Attacks on encryption schemes. Ciphertext only attack. : only ciphertexts are given. Known plaintext attack. : (plaintext, ciphertext) pairs are given. Kyle Johnson. Cryptology. Comprised of both Cryptography and Cryptanalysis. Cryptography. . - which . is the . practice and study of techniques for secure communication in the presence of third parties. Diffie. -Hellman. The . ElGamal. . Public-key System. Online Cryptography Course Dan Boneh. Recap: public key encryption: . (Gen, E, D). E. D. pk. m. c. c. m. pk. , . sk. pk. c. . . . Enc. pk. (m). m. = . Dec. sk. (c). c. pk. pk. Public-key encryption. A public-key encryption scheme is composed of three PPT algorithms:. Gen: . key-generation algorithm. Cryptography Lecture 3 So far… “Heuristic” constructions; construct, break, repeat, … Can we prove that some encryption scheme is secure? First need to define what we mean by “secure” in the first place… ~Amariah Condon. ~Janette Fong. ~Janice Lau. Cryptography. Definition – . JANETTe. Cryptography is the study of techniques for secure communication in the presence of third parties.. Applications of cryptography include ATM cards, computer passwords, etc..