By Josef Pieprzyk
This paintings provides fresh advancements in hashing set of rules layout. Hashing is the method of constructing a brief digest (i.e., sixty four bits) for a message of arbitrary size, for examination- ple 20 Mbytes. Hashing algorithms have been first used for sear- ching documents in databases; they're primary for electronic si- gnature purposes and are used for authentication with no secrecy. overlaying all useful and theoretical matters with regards to the layout of safe hashing algorithms the booklet is self contained; it comprises an in depth bibliography at the topic.
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Additional resources for Design of Hashing Algorithms
9 message authentication standard represents one such technique. MACs make use of traditional cryptographic algorithms such as the DES, and rely on a secret authentication key to ensure that only authorized persons can generate a message with the appropriate MAC. As we mentioned earlier, RSA digital signature can be used to establish both the authenticity of a document and its origin. Because of the intensely computational nature of RSA, most digital signature schemes make use of hashing techniques.
2 Message A u t h e n t i c a t i o n C o d e s and Manipulation D e t e c t i o n Codes As the presence of redundancy in the message distinguishes authentic information from bogus information, in some methods the modification of information is detected through the distortion of the internal redundancy of the information. , 1992]. There are two major approaches to introducing controlled redundancy into the information. The redundant information can be calculated as a cryptographic hash function of the message M under the control of a secret key K known only to the communicating entities.
The hash value must be sensitive to all possible permutations and rearrangements, as well as the edition, deletion, and insertion of the text. 3. If two different texts are compressed, tile probability that the two hash values are equal should be a uniformly distributed random variable. 4. The length in bits of the hash value should be long enough so that it resists the so-called birthday attack. With today's technology this Chapter 2 OVERVIEW OF HASH FUNCTIONS 20 value should be of the order of 128 bil:s.