Results 211 to 220 of about 4,309 (262)

Approximate image message authentication codes

IEEE Transactions on Multimedia, 2001
This paper introduces approximate image message authentication codes (IMACs) for soft image authentication. The proposed approximate IMAC survives small to moderate image compression and it is capable of detecting and locating tampering. Techniques such as block averaging and smoothing, parallel approximate message authentication code (AMAC ...
Liehua Xie, Gonzalo R. Arce, R. F. Graveman   +2 more
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Message Authentication with Manipulation Detection Code

1983 IEEE Symposium on Security and Privacy, 1983
In many applications of cryptography, assuring the authenticity of communications is as important as protecting their secrecy. A well known and secure method of providing message authentication is to compute a Message Authentication Code (MAC) by encrypting the message.
Robert R. Jueneman, Stephen M. Matyas, Carl H. Meyer   +2 more
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Vectorization of Poly1305 Message Authentication Code

2015 12th International Conference on Information Technology - New Generations, 2015
This paper describes software optimizations for the message authentication code Poly1305. We leverage the wide vectorization capabilities of the new AVX2 architecture, to speed up the authenticator generation on the latest x86_64 processors. In addition, we show how to apply vectorization for the future AVX-512 architecture to achieve a further speedup.
Martin Goll, Shay Gueron
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On the security of iterated message authentication codes

IEEE Transactions on Information Theory, 1999
Summary: The security of iterated message authentication code (MAC) algorithms is considered, and in particular, those constructed from unkeyed hash functions. A new MAC forgery attack applicable to all deterministic iterated MAC algorithms is presented, which requires on the order of \(2^{n/2}\) known text-MAC pairs for algorithms with \(n\) bits of ...
Bart Preneel, Paul C. van Oorschot
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Throughput Optimization of the Cipher Message Authentication Code

2007 15th International Conference on Digital Signal Processing, 2007
A new algorithm for producing message authenticating code (MAC) was recently proposed by NIST. The MAC protects both a message's integrity - by ensuring that a different MAC will be produced if the message has changed - as well as its authenticity - because only someone who knows the secret key could be able to generate a valid MAC.
Harris E. Michail, Athanasios P. Kakarountas, Georgios N. Selimis, Constantinos E. Goutis   +3 more
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Key-Indistinguishable Message Authentication Codes

2014
While standard message authentication codes (MACs) guarantee authenticity of messages, they do not, in general, guarantee the anonymity of the sender and the recipient. For example it may be easy for an observer to determine whether or not two authenticated messages were sent by the same party even without any information about the secret key used ...
Joël Alwen, Martin Hirt, Ueli Maurer, Arpita Patra, Pavel Raykov   +4 more
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Homomorphic Signatures and Message Authentication Codes

2014
Homomorphic message authenticators allow to validate computation on previously signed data. The holder of a dataset {m 1, …, m l} uses her secret key sk to produce corresponding tags (σ 1, …, σ l) and stores the authenticated dataset on a remote server. Later the server can (publicly) compute m = f(m 1, …, m l) together with a succinct tag σ certifying
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Trust in corrected messages protected by message authentication codes

Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, 2011
An algorithm for correction and soft verification of message protected by cryptographic check values like MAC is presented. The algorithm uses soft output values of the channel decoder which are given as input of the cryptographic verification module. The criterion of standard verification becomes less strict, when the algorithm for correction and soft
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Message Authentication Codes (MACs)

2010
A Message Authentication Code (MAC), also known as a cryptographic checksum or a keyed hash function, is widely used in practice. In terms of security functionality, MACs share some properties with digital signatures, since they also provide message integrity and message authentication. However, unlike digital signatures, MACs are symmetric-key schemes
Christof Paar, Jan Pelzl
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A Parallelizable Message Authentication Code

Journal of Software, 2007
This paper defines and analyzes a fully deterministic parallelizable block-cipher mode of operation for message authentication— DPMAC (deterministic parallelizable message authentication code). DPMAC is constructed based on a 128-bit block cipher, works for strings of any bit length, and employs a single block-cipher key.
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