In cryptography, a Substitution box (S-box) is one of the basic components of a symmetric key cryptography. Generally, it transforms a number of m input bits into n output bits. In this paper, there are presented the cryptographic properties of S-boxes and it is introduced a knowledge-based schema for building S-boxes.

In threshold cryptography the goal is to distribute the computation of basic cryptographic primitives across a number of nodes in order to relax trust assumptions on individual nodes, as well as to introduce a level of fault-tolerance against node compromise. Most threshold cryptography has previously looked at the distribution of public key primitives, particularly threshold signatures and thr...

In this paper, an efficient authenticated asymmetric key exchange scheme has been designed based on the features of the Threshold Cryptography [11]. The method provides authentication and key establishment (like RSA, ) over an insecure channel using shares of two prime numbers and is secure against even off-line dictionary attack. In the proposed scheme, , and are all secret and each of the two...

It is challenging to secure a wireless sensor network (WSN) because its inexpensive, tiny sensor nodes do not have the necessary processing capability, memory capacity, and battery life to take advantage of the existing security solutions for traditional networks. Existing security solutions for wireless sensor networks are mostly based on symmetric key cryptography with the assumption that sen...

Cryptography is an important field in the area of data encryption. There are different cryptographic techniques available varying from the simplest to complex. One of the complex symmetric key cryptography techniques is using Data Encryption Standard Algorithm. This paper explores a unique approach to generation of key using fingerprint. The generated key is used as an input key to the DES Algo...

Current security model in Global System for Mobile Communications (GSM) predominantly use symmetric key cryptography. The rapid advancement of Internet technology facilitates online trading, banking, downloading, emailing using resource-constrained handheld devices such as personal digital assistants and cell phones. However, these applications require more security than the present GSM support...

Cryptography algorithms are essential building blocks used to provide security on public communication networks such as the Internet. Concurrent with the increases in wireless connectivity and data rates, security protocols have been expanded over the past years to include more resource-friendly cryptography algorithms such as Elliptic Curve Cryptography (ECC). In this paper, we first describe ...

Symmetric cryptography has been mostly used in security schemes in sensor networks due to the concern that public key cryptography (PKC) is too expensive for sensor devices. While these schemes are efficient in processing time, they generally require complicated key management, which may introduce high memory and communication overhead. On the contrary, PKC-based schemes have simple and clean k...

We propose a new general framework for the security of multivariate quadratic (MQ) schemes with respect to attacks that exploit the existence of linear subspaces. We adopt linearity measures that have been used traditionally to estimate the security of symmetric cryptographic primitives, namely the nonlinearity measure for vectorial functions introduced by Nyberg at Eurocrypt ’92, and the (s, t...

In recent years, some cryptographic algorithms have gained popularity due to properties that make them suitable for use in constrained environments like mobile information appliances, where computing resources and power availability are limited. In this paper, we select a set of public-key, symmetric-key and hash algorithms suitable for such environments and study their workload characteristics...