From semantic security to chosen ciphertext security
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Computer Science—the theory, representation, processing, communication and use of information—is fundamentally transforming every aspect of human endeavor. The Department of Computer Science at Iowa State University advances computational and information sciences through; 1. educational and research programs within and beyond the university; 2. active engagement to help define national and international research, and 3. educational agendas, and sustained commitment to graduating leaders for academia, industry and government.
History
The Computer Science Department was officially established in 1969, with Robert Stewart serving as the founding Department Chair. Faculty were composed of joint appointments with Mathematics, Statistics, and Electrical Engineering. In 1969, the building which now houses the Computer Science department, then simply called the Computer Science building, was completed. Later it was named Atanasoff Hall. Throughout the 1980s to present, the department expanded and developed its teaching and research agendas to cover many areas of computing.
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1969-present
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- College of Liberal Arts and Sciences (parent college)
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Abstract
A chosen ciphertext attack against the RSA encryption standard PKCS#1 v1.5 was introduced by Daniel Bleichenbacher at Crypto '98. This attack was the first example where an adaptive chosen ciphertext attack is not just a theoretical concept but a practical method to crack a semantically secure encryption scheme.
This paper reviews the notion of the semantic security which was believed to be secure enough in reality and the reason for which this belief was denied. The paper also presents a demonstration of the Bleichenbacher's attack by using a simplified version of PKCS#1 v1.5 format.