By Dan Boneh, Glenn Durfee (auth.), Jacques Stern (eds.)

This e-book constitutes the refereed lawsuits of the overseas convention at the conception and alertness of Cryptographic ideas, EUROCRYPT '99, held in Prague, Czech Republic in may perhaps 1999.
The 32 revised complete papers provided have been rigorously chosen in the course of hugely aggressive reviewing procedure. The ebook is split in topical sections on cryptanalysis, hash services, foundations, public key cryptosystems, watermarking and fingerprinting, elliptic curves, new schemes, block ciphers, disbursed cryptography, instruments from comparable parts, and broadcast and multicast.

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Extra resources for Advances in Cryptology — EUROCRYPT ’99: International Conference on the Theory and Application of Cryptographic Techniques Prague, Czech Republic, May 2–6, 1999 Proceedings

Example text

Here, Alice and Bob are not concerned about the secrecy of the information. In order to detect the actions of Eve, Alice attaches to the plaintext an authentication tag that is a function of a shared secret key and of the plaintext. Bob recomputes the tag and accepts the plaintext as authentic if the tag is the same. As in the Vernam scheme, the secret key can be used only once. Eve can perform three types of attacks: (i) Eve can create a new plaintext and send it to Bob, pretending that it came from Alice (impersonation attack); (ii) Eve can wait until she observes a plaintext and replace it by a different plaintext (substitution attack); (iii) Eve can choose freely between both strategies (deception attack).

If the keys are generated using a finite pseudo-random function, the unconditional security is lost, but one has achieved a clear separation between compression (in a combinatorial way) and the final cryptographic step. This makes it easier to analyze and understand the resulting scheme. 3 Composition Constructions The following propositions show how universal hash functions can be combined in different ways in order to increase their domains, reduce , or decrease the range. Several of these results were applied by Wegman and Carter [40].

Note that the resulting value of is too small. However, choosing a smaller value of n that is not a multiple of 32 induces a performance penalty. Scheme F: the input is divided into 2048 blocks of 128 bytes; each block is hashed twice using MMH. The length of the intermediate string is 16 384 bytes. It is not possible to obtain a value of closer to 2−32 in an efficient way. Note that for bucket hashing and its variant the speed was measured under DOS, while for the other schemes (that use a finite field arithmetic library), the speed was measured under Windows ’95.

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