We consider the question of efficiently extending the key length of block ciphers. To date, the approach providing highest security is triple encryption (used e.g. in Triple-DES), which was proved to have roughly κ+ min{n/2, κ/2} bits of security when instantiated with ideal block ciphers with key length κ and block length n, at the cost of three block-cipher calls per message block. This paper...

In this paper we introduce a vector ISA extension to facilitate sparse matrix manipulation on vector processors (VPs). First we introduce a new Block Based Compressed Storage (BBCS) format for sparse matrix representation and a Block-wise Sparse Matrix-Vector Multiplication approach. Additionally, we propose two vector instructions, Multiple Inner Product and Accumulate (MIPA) and LoaD Section ...

We describe a patient who received an apparently uneventful extradural block in labour but developed rapid extension of neural block within minutes of receiving her first incremental dose 2 h later. Computed contrast tomography revealed radio-opaque dye within both the subdural and subarachnoid spaces, but none within the extradural space. This case report demonstrates that subdural spread of l...

Almost block diagonal linear systems of equations can be exemplified by two modules. This makes it possible to construct all sequential forms of band and/or block elimination methods, six old and fourteen new. It allows easy assessment of the methods on the basis of their operation counts, storage needs, and admissibility of partial pivoting. It unveils a robust partial pivoting strategylocal p...

We present a technique which aids in the linear cryptanalysis of a block cipher and allows for a reduction in the amount of data required for a successful attack. We note the limits of this extension when applied to DES, but illustrate that it is generally applicable and might be exceptionally successful when applied to other block ciphers. This forces us to reconsider some of the initial attem...

SUMMARY In this paper we consiaer the problem wnere repeated measurements are taKen on eacn experimental unit of a randomized experimental design. If the design is a randomized complete block then traditionally a split-bloCK analysis is used. Here we consider an extension of tne traaitional sol it-bloCK analysis where \~e allow for several orthogonal autocorrelated error components deoending on...

We propose a new concurrent model for imperative languages where concurrency occurs at a subprogram level. This model introduces a new block sequential statement of the form ♯(G1, . . . , Gn) where each Gi is a statement. This statement tells the machine to execute G1, . . . , Gn sequentially and atomically (i.e., without interleaving). It therefore enhances atomicity and predictability in conc...

We describe an approach to automatic parallelisation of programs written in Sieve C++ (Codeplay’s C++ extension), using the Sieve compiler and runtime system. In Sieve C++, the programmer encloses a performance-critical region of code in a sieve block, thereby instructing the compiler to delay sideeffects until the end of the block. The Sieve system partitions code inside a sieve block into ind...

We present several proposals for extending the Open Community Runtime (OCR) specification. The extension are identifiers with local validity, which use the concept of futures to provide OCR implementations more optimization opportunities, labeled GUIDs with creator functions, which are based on the local identifiers and allow the developer to create arrays of OCR objects that are safe from race...

To separate out the noise behaviour from color image several approaches has been identified, adaptive filter which is extension of LMS filter is one of them to achieve higher signal to noise ratio. In this paper, comparison of adaptive filter with different structure and two dimensional block processing for color image noise abolition is proposed. Simulations for different block size as well as...