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By Robshaw M. J.

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Extra resources for Block Ciphers

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Most types of stream cipher have their own characteristics and this means that di erent approaches are required 50 Block Ciphers for the cryptanalysis of each type. While DES has remained secure there is no impetus (apart from export concerns) to use any other block cipher, particularly one that is not standardized and has not been thoroughly cryptanalyzed. It is only now that those who are implementing block ciphers realize that a DES replacement is needed | it will take some time before a block cipher can ever be viewed as o ering the same level of security as DES does even today.

On the one hand it has been a focal point for cryptanalysis and for trying out new cryptanalytic tools. It has brought the science of cryptology into academic surroundings and provided a blossoming of interest throughout the technologically minded public. On the other hand DES has perhaps overshadowed all other block cipher developments. While there is an increasing number of block cipher proposals, they are often very similar in design to DES. By contrast, the eld of stream ciphers provides a vast number of alternatives, each with individual advantages and claims of security.

Despite the nice features of these ciphers and what is, so far, fairly limited success in cryptanalysis, they have failed to capture much attention outside the research community. 7 MMB and 3-WAY In connection with his work in the analysis of IDEA, Daemen has made a proposal for a di erent block cipher based on the use of modular multiplication [35]. MMB (Modular Multiplication based Block cipher) is a 128-bit block cipher with a key of length 128 bits. It is quite closely related to IDEA in that it is based around the devices of modular multiplication and bitwise exclusive-or (xor), but it is claimed 10.

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