Publication

DFC Update

Serge Vaudenay
1999
Conference Papers

Abstract

This document reports an update of DFC. We answer to a question about the rationale for the CP Confusion Permutation. We give new implementation results for DFC. In particular we present an impressively fast implementation which takes 323 cycles on Compaq's 21164 Alpha microprocessor. On the new 21264 we expect to reach software encryption rates over 500 Mbps. We also discuss making DFC scalable to allow the block size or the number of rounds, in the encryption or key schedule, to be varied. Finally, we describe how DFC may be subject to slight change in its key schedule in order to fix a minor drawback noticed by Coppersmith.

Official source

https://infoscience.epfl.ch/entities/publication/3bcc958e-28c7-4d4d-bfc2-7c7261cbf74b

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Serge Vaudenay
1999
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/3bcc958e-28c7-4d4d-bfc2-7c7261cbf74b

About this result

Related concepts (22)

Key schedule

In cryptography, the so-called product ciphers are a certain kind of cipher, where the (de-)ciphering of data is typically done as an iteration of rounds. The setup for each round is generally the same, except for round-specific fixed values called a round constant, and round-specific data derived from the cipher key called a round key. A key schedule is an algorithm that calculates all the round keys from the key. Some ciphers have simple key schedules.

Encryption

In cryptography, encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm.

Block cipher

In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage and exchange of data, where such data is secured and authenticated via encryption. A block cipher uses blocks as an unvarying transformation. Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key.