Por favor utiliza este link para citar o compartir este documento: http://repositoriodigital.academica.mx/jspui/handle/987654321/76701
Título: A Generic Method to Extend Message Space of a Strong Pseudorandom Permutation
Palabras clave: strong pseudorandom permutation
weak pseudorandom function
universal hash function
modes of operations
Fecha de publicación: 9-Jul-2012
Editorial: Computación y Sistemas
Descripción: Let E be a strong pseudorandom permutation (or SPRP) secure enciphering scheme (i.e., a length-preserving encryption scheme) which can only encrypt messages of size multiple of n, the block size of the underlying block cipher. There are several such constructions, e.g., CBC mode or cipher block chaining mode. In this paper we present how a secure enciphering scheme <img border=0 src="../../../../../img/revistas/cys/v12n3/a4s1.jpg">can be obtained which can encrypt any messages of size at least n based on E and some other cryptographic objects such as weak pseudorandom function (or WPRF) and a universal hash function. So <img border=0 src="../../../../../img/revistas/cys/v12n3/a4s1.jpg">can encrypt messages which might contain incomplete message blocks. Since an enciphering scheme is a length preserving encryption algorithm, one can not use a padding rule to handle the incomplete message block. In 2007, Ristenpart and Rogaway first proposed a secure method known as XLS (eXtension by Latin Squares). It needs two invocations of a block cipher e whose key is chosen independently of the key of E. The SPRP security of XLS is based on the SPRP security of the block cipher e. Our proposed enciphering scheme is SPRP and it needs only one invocation of a WPRF and two invocations of a universal hash function. Any SPRP construction, e.g., a secure block cipher, is a WPRF. Moreover, there are other several efficient constructions for universal hash functions and WPRF which are not SPRP. Thus, we are able to replace SPRP security by two weaker security notions to extend the domain of a secure enciphering scheme.
Other Identifiers: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-55462009000100004
Aparece en las Colecciones:Computación y Sistemas

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