ZMAC+ – An Efficient Variable-output-length Variant of ZMAC

Secure and efficient random functions with variable-length output

Many random functions, like Hash, MAC, PRG, have been used in various network applications for different security choices, however they either are fast but insecure, or are cryptographic secure but slow. To integrate them together, in this paper we present a new family of square random functions, including SqHash, SqMAC and SqPRG, based on a specially truncated function (MSB or LSB), as well as...

ZMAC: A Fast Tweakable Block Cipher Mode for Highly Secure Message Authentication

We propose a new mode of operation called ZMAC allowing to construct a (stateless and deterministic) message authentication code (MAC) from a tweakable block cipher (TBC). When using a TBC with n-bit blocks and t-bit tweaks, our construction provides security (as a variable-input-length PRF) beyond the birthday bound with respect to the block-length n and allows to process n + t bits of inputs ...

An Efficient Variable-Length Tap FIR Filter Chip

Abstract This paper proposes a novel VLSI architecture for an FIR filter chip providing variable-length taps. To change the number of taps, we propose two special features called a data-reuse structure and a recurrent-coefficient scheme. These features consist of several MUXs and registers and reduce the number of gates over 20 % compared with existing chips using an address generation unit and...

Soft-input soft-output decoding of variable length codes

We present a method for utilizing soft information in decoding of variable length codes (VLCs). When compared with traditional VLC decoding, which is performed using “hard” input bits and a state machine, the soft-input VLC decoding offers improved performance in terms of packet and symbol error rates. Soft-input VLC decoding is free from the risk, encountered in hard decision VLC decoders in n...

Learning Variable Memory Length Markov Chains from Noisy Output