Advisor

Thomas Shrimpton

Date of Award

Summer 8-7-2015

Document Type

Dissertation

Degree Name

Doctor of Philosophy (Ph.D.) in Computer Science

Department

Computer Science

Physical Description

1 online resource (vi, 94 pages)

Subjects

Cryptography -- Mathematics, Computer security, Computer systems -- Access control, Data encryption (Computer science)

DOI

10.15760/etd.2481

Abstract

Tweakable ciphers are a building block used to construct a variety of cryptographic algorithms. Typically, one proves (via a reduction) that a tweakable-cipher-based algorithm is about as secure as the underlying tweakable cipher. Hence improving the security or performance of tweakable ciphers immediately provides corresponding benefits to the wide array of cryptographic algorithms that employ them. We introduce new tweakable ciphers, some of which have better security and others of which have better performance than previous designs. Moreover, we demonstrate that tweakable ciphers can be used directly (as opposed to as a building block) to provide authenticated encryption with associated data in a way that (1) is robust against common misuses and (2) can, in some cases, result in significantly shorter ciphertexts than other approaches.

Persistent Identifier

http://archives.pdx.edu/ds/psu/15931

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