bart.preneel(AT)esat.kuleuven.be

Abstract. All-or-nothing property is a new encryption mode proposed by Rivest and has the property that one must decrypt the entire ciphertext to determine any plaintext block. In this paper, we propose a hash function with all-or-nothing property. The proposed scheme can use the existing hash functions without changing their structures, and it is secure against all of known attacks. Moreover, the proposed method can be easily extended to the MAC(Message Authentication Code) and provide message confidentiality as well as authentication. 1

Abstract. One-way hash functions are an important toolinachieving authentication and data integrity. The aim of this paper is to propose anovel one-way hash function based on cellular automata whose cryptographic properties have been extensivelystudiedover the past decade or so. Furthermore, security of the proposed one-way hash function is analyzed by the use of very recently published results on applications of cellular automata in cryptography. The analysis indicates that the one-way hash function is secure against all known attacks. An important feature of the proposed one-way hash function is that it is especially suitable for compact and fast implementation in hardware, which is particularly attractive to emerging security applications that employ smart cards, such asdigital identi cation cards and electronic cash payment protocols, 1

This paper proposes a novel one-way hash function that can serve as a tool in achieving authenticity and data integrity. The one-way hash function can be viewed as a representative of a family of fast dedicated one-way hash functions whose construction is based on linear cellular automata over GF(q). The design and analysis of security of the function is accomplished by the use of very recently published results on cellular automata and their applications in cryptography. The analysis indicates that the one-way hash function is secure against all known attacks. A promising property of the proposed one-way hash function is that it is especially suitable for compact and fast implementation.