We study version selection schemes for hard real-time communications in multi-access networks. In many hard real-time systems a message may have several versions, e.g., a long version and a short version. The long version of a message contains complete information and is the preferred version to be transmitted. The short version contains less information and requires less time to be transmitted...

Message integrity from one sender to one receiver is typically achieved by having the two parties share a secret key to compute a Message Authentication Code (MAC). We consider the “multicast MAC”, which is a natural generalization to multiple receivers. We prove that one cannot build a short and efficient collusion resistant multicast MAC without a new advance in digital signature design.

This paper provides standard instructions on how to protect short text messages with one-time pad encryption. The encryption is performed with nothing more than a pencil and paper, but provides absolute message security. If properly applied, it is mathematically impossible for any eavesdropper to decrypt or break the message without the proper key.

In order to enable the graduates to obtain employment information they want anytime and anywhere, the short message platform is described in this paper. The system includes WEB visiting pattern and SMS visiting pattern through which the graduates can get access to employment information. At the mean time, manager in charge of employment can send short message to the graduates through SMS. The i...

We first analyze the security of a short signature scheme without random oracles called ZCSM scheme and point out that it cannot support unforgeable under the chosen message and public key attacks. We also propose a new signature scheme without random oracle using bilinear pairing that is existentially unforgeable under a chosen message attack. The security of the proposed scheme depends on a c...

In most journals, there are letters or answers sections. Letters to the editor are usually a type of short communication that can be written on any topic that attracts the attention of the readers. Although articles are stringently vetted before publication in a journal, some issues can still go unnoticed. In this situation, readers can offer their interpretations by writing a letter to the edi...

In this work we describe the design and implementation of a system, which uses the wireless GSM Short Message Service data transfer technology, in order to give network managers access to services on remote network equipment, via a cellular phone. First, we present the mechanism and discuss the features and restrictions of the Short Message Service, as well as the limitations of current cellula...

Non-attendance reduces clinic and provider productivity and efficiency, compromises access and increases cost of health care. This systematic review of the English language literature (November 1999-November 2009) compares telephone, mail, text/short message service, electronic mail and open-access scheduling to determine which is best at reducing outpatient non-attendance and providing net fin...