Cipher Device Research Articles

Sec-service level agreement analysis of OFB mode in block cipher

In a cipher device, the OFB operation mode must be analysed for quality performance according to various secure communication channel environments. Many cipher applications have evaluated issues of security quality. This paper reviews channel transmission performance for OFB operation mode of cipher communication in a fading channel. This result contributes for Sec-SLA evaluation and probabilistic error effect of each cipher device.

An Identification System of Original Painting Artworks Based on Smart Card

According to the current difficult situation of identifying original painting artworks, this paper designed and implemented a security communication protocol based on the hardware cipher device using the technology of the Internet of Things and the knowledge of cryptography. And we applied the protocol to the Web for identification of original painting artworks. After the achievement, the system can work safely, fast and is easy to operate. So it can be considered as a feasible scheme for identification of original painting artworks.

임베디드 리눅스 기반의 SCADA 직렬통신 구간 암호화 장치 개발

The Supervisory Control and Data Acquisition Systems (SCADA) system provides monitoring, data gathering, analysis, and control of the equipment used to manage most infrastructure. The SCADA Network is implemented in a various manner for larger utilities, and multiple types of protocol and communication interfaces are used to network the control center to remote sites. The existing SCADA equipment and protocols were designed and implemented with availability and efficiency, and as a result security was not a consideration. So, performance, reliability, flexibility and safety of SCADA systems are robust, while the security of these systems is often weak. This makes some SCADA networks potentially vulnerable to disruption of service, process redirection, or manipulation of operational data that could result in public safety concerns and/or serious disruptions to the infrastructure. To reduce the risks, therefore, there is a need to have a security device such as cipher devices or cryptographic modules for security solutions. In this paper we develop an embedded cipher device for the SCADA equipment. This paper presents a cipher device designed to improve the security of its networks, especially in the serial communication.

MECHANICAL CIPHER SYSTEMS IN THE SPANISH CIVIL WAR

We present a brief study of the mechanical cipher systems used in the Spanish Civil War (1936–1939). This research is based on original documents obtained from various archives. We do not address the manual methods of ciphering that were more frequently used in the fighting nor the mechanisms of simple ciphering, methods like the strip cipher, the R cipher or the RF cipher [10]. We make a brief description of the cipher device used by the Nationalist army, more commonly known as the “Clave Norte” or “North Key”.

SIR SAMUEL MORLAND'S MACHINA CYCLOLOGICA CRYPTOGRAPHICA

A 17th century treatise featuring several cryptographic methods includes a cipher device used to perform an autokey.

URKRYPTOGRAFEN (“THE CLOCK CRYPTOGRAPH”)

Supplementary information concerning a Danish military cipher device, first shown in Cryptologia (Cryptanalyst's Corner) by Greg Mellen 19 years ago. “The Clock Cryptograph” is basically a nicely implemented Wheatstone cipher disk. It was in active use in the Danish armed forces from 1934 (or a little earlier) until around 1948.

AN EARLY CIPHER DEVICE: FREDRIK GRIPENSTIERNA'S MACHINE

This article presents a description and analysis of the early Swedish cipher device of Fredrik Gripenstierna.

AN UNIDENTIFIED CIPHER DEVICE

ABSTRACT A description of a simple cipher device, similar in some ways to Wheatstone's Cryptograph.

THE SIGCUM STORY: CRYPTOGRAPHIC FAILURE, CRYPTOLOGIC SUCCESS

The development and fielding of the Converter M-228 (SIGCUM) teletypewriter cipher device by the U. S. Army during World War II is described, as is the machine's subsequent failure and removal from service. The cryptologic principles involved in the M-228 axe explained, as well as the method by which the system was solved.

CRYPTANALYSIS OF THE CIARCIA CIRCUIT CELLAR DATA ENCRYPTOR

The cipher device presented in the September, 1986 issue of Byte is analyzed. A variety of simple and effective attacks, based on different knowledge or assumptions about the plaintext, are described.

THE GENESIS OF THE JEFFERSON/BAZERIES CIPHER DEVICE

Cipher Device M-94 was adopted by the United States Army in 1922, the same year papers found in the Library of Congress revealed that Thomas Jefferson had invented the same device about 125 years earlier. Almost 100 years after Jefferson, Commandant Etienne Bazeries, a French army cryptologist, independently developed a similar device. Both inventions, which ultimately formed the basis for the most widely used cryptosystems in the 20th century, apparently had a common antecedent in the letter lock, which was popularized in France by Edme Regnier during the late 18th and early 19th centuries.

THE CRYPTOLOGY OF MULTIPLEX SYSTEMS

Multiplex systems are a family of cryptosystems whose origin can be traced to Thomas Jefferson. They were not used extensively, however, until the period just prior to World War II. The characteristic feature of a multiplex system is that it permits the encipherer to select the ciphertext from among 25 alternatives, reducing the likelihood that the same block of plaintext will result in identical blocks of ciphertext. This paper traces the history of multiplex systems and examines both their cryptographic and their cryptanalytic aspects. The computer simulation of one system, U.S. Army Signal Corps Cipher Device, Type M-94, is described.

THE CRYPTOLOGY OF MULTIPLEX SYSTEMS

Multiplex systems are a family of cryptosystems whose origin can be traced to Thomas Jefferson. They were not used extensively, however, until the period just prior to World War II. The characteristic feature of a multiplex system is that it permits the encipherer to select the ciphertext from among 25 alternatives, reducing the likelihood that the same block of plaintext will result in identical blocks of ciphertext. This paper traces the history of multiplex systems and examines both their cryptographic and their cryptanalytic aspects. The computer simulation of one system, U.S. Army Signal Corps Cipher Device, Type M-94, is described.