HW12010 - HW #1: Introduction and Symmetric Key Encryption...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
HW #1: Introduction and Symmetric Key Encryption CS 6903: Modern Cryptography Spring 2010 [100pts] DUE 03/05/2010 (11am) Problem 1 [10pts] What are the fundamental goals in information security? Give a practical scenario each where each of these goals are desired? Explain how cryptography can be used to achieve these goals? Problem 2 [10pts] We studied various notions of security of a symmetric encryption scheme (against a passive attacker), namely, key recovery (KR), one-wayness (OW), indistinguishability (IND) and semantic security (SEM). State each of these notions (informally). What are the relations among these security notions (we studied some of these in the class)? Just state the relations. Is one-wayness a stronger security notion than key recovery? Show why/why not. Give an example to illustrate where OW security might not be sufficient, but IND is. Problem 3 [10pts] We discussed various active attacks on a symmetric encryption schemes, namely, chosen- plaintext attack (CPA), chosen-ciphertext attacks (CCA-1 and CCA-1). Describe each one of
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

HW12010 - HW #1: Introduction and Symmetric Key Encryption...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online