1.
Ingemarsson, Ingemar
(author)
Encryption in Data Networks with Application to Teletex
1978
Reports (other academic/artistic) abstract
TELETEX is a new international telecommunication service for text communication between terminals capable of data storage and possibly integrated in a information processing system, [l]. The new service is intended to fill the same needs as does business mail. With regard to information security this means that the information handled by the TELETEX system shall not be unintentionally changed or destroyed or lost to an unintended receiver. Measures to prevent this are called information protection. (We prefer to use the terms information security and information protection rather than data security and data protection. The reason is that "data " in the sense of a string of symbol s may be lost without revealing the information represented by the data. This is for example the case when the data consists of encrypted information).One of the most efficient methods for information protection is to use encryption. This means that the information is transmitted using a ''language" which i s not understood by is efficiently protected against loss and in most cases also against undetected change. Cryptological methods can also be used to detect information destruction. In Section 2 of this report we discuss the basic problems involved with the use of encryption in data networks in general.In a separate report we discuss the possible threats to the information security in TELETEX. This leads to suggestions regarding suitable protection methods. Our standpoint is that TELETEX shall offer at least the same level of information security as does the established mail distribution system.
2.
3.
Olerup, Agneta
(author)
Byggande av en simuleringsmodell.
1970
In: Erhvervsokonomisk Tidksrift. - 0014-0147. ; 34
Journal article (peer-reviewed) abstract
In the article a simulation model of pricing behaviour on the gasoline market in Sweden is reported. First a brief review of price-changes during a historical period is provided. Next the model is presented in three steps with increasing level of detail for each step. The companies in the model are assumed to have three goals but only one variable for action
4.
Olerup, Agneta
(author)
Introduktion till Systemalgebra (3:e uppl)
1974
Book (pop. science, debate, etc.) abstract
Systemalgebra kan användas för att ge en beskrivning av informationsmängder och samband mellan dem oberoende av den tekniska utformningen av ett IT-system (eller databehandlingssystem). Matriser, och grafer, används för att beskriva sambanden mellan informationsmängder, vilket gör det möjligt att identifiera precedenter och succedenter till en informationsmängd. Ett processdiagram och en incidensmatris identifierar processer med input och output. Systemalgebran beskriver fil- och datastrukturer systematiskt och enhetligt, vilket gör det möjligt att analysera sambanden mellan informationsmängder. Den kan även användas för behovsberäkningar och positioneringar.
5.
