An investigation of the security of passwords derived from African languages
- Authors: Sishi, Sibusiso Teboho
- Date: 2019
- Subjects: Computers -- Access control -- Passwords , Computer users -- Attitudes , Internet -- Access control , Internet -- Security measures , Internet -- Management , Data protection
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/163273 , vital:41024
- Description: Password authentication has become ubiquitous in the cyber age. To-date, there have been several studies on country based passwords by authors who studied, amongst others, English, Finnish, Italian and Chinese based passwords. However, there has been a lack of focused study on the type of passwords that are being created in Africa and whether there are benefits in creating passwords in an African language. For this research, password databases containing LAN Manager (LM) and NT LAN Manager (NTLM) hashes extracted from South African organisations in a variety of sectors in the economy, were obtained to gain an understanding of user behaviour in creating passwords. Analysis of the passwords obtained from these hashes (using several cracking methods) showed that many organisational passwords are based on the English language. This is understandable considering that the business language in South Africa is English even though South Africa has 11 official languages. African language based passwords were derived from known English weak passwords and some of the passwords were appended with numbers and special characters. The African based passwords created using eight Southern African languages were then uploaded to the Internet to test the security around using passwords based on African languages. Since most of the passwords were able to be cracked by third party researchers, we conclude that any password that is derived from known weak English words marked no improvement in the security of a password written in an African language, especially the more widely spoken languages, namely, isiZulu, isiXhosa and Setswana.
- Full Text:
- Date Issued: 2019
- Authors: Sishi, Sibusiso Teboho
- Date: 2019
- Subjects: Computers -- Access control -- Passwords , Computer users -- Attitudes , Internet -- Access control , Internet -- Security measures , Internet -- Management , Data protection
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/163273 , vital:41024
- Description: Password authentication has become ubiquitous in the cyber age. To-date, there have been several studies on country based passwords by authors who studied, amongst others, English, Finnish, Italian and Chinese based passwords. However, there has been a lack of focused study on the type of passwords that are being created in Africa and whether there are benefits in creating passwords in an African language. For this research, password databases containing LAN Manager (LM) and NT LAN Manager (NTLM) hashes extracted from South African organisations in a variety of sectors in the economy, were obtained to gain an understanding of user behaviour in creating passwords. Analysis of the passwords obtained from these hashes (using several cracking methods) showed that many organisational passwords are based on the English language. This is understandable considering that the business language in South Africa is English even though South Africa has 11 official languages. African language based passwords were derived from known English weak passwords and some of the passwords were appended with numbers and special characters. The African based passwords created using eight Southern African languages were then uploaded to the Internet to test the security around using passwords based on African languages. Since most of the passwords were able to be cracked by third party researchers, we conclude that any password that is derived from known weak English words marked no improvement in the security of a password written in an African language, especially the more widely spoken languages, namely, isiZulu, isiXhosa and Setswana.
- Full Text:
- Date Issued: 2019
Efficient market hypothesis in South Africa: an analysis using the flexible form unit root test
- Authors: Nomatye, Anelisa
- Date: 2019
- Subjects: Stocks -- Prices -- South Africa , Stock exchanges -- South Africa Stocks -- South Africa Johannesburg Stock Exchange Economic indicators -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/42825 , vital:36697
- Description: An efficient stock market is characterised by prices that are reflective of all the information such that there are no opportunities for arbitrageurs. In an efficient market, it is impossible to beat the market, therefore it follows that stock prices in an efficient market should follow a random walk. This study investigates whether the Johannesburg Stock Exchange (JSE) is an efficient market using the JSE Top 40 listed stocks, thus the relevance of the EMH in the current South African market is analysed. A corerlation analysis is undertaken to find whether the individual stocks in the different sectors are correlated in their returns, or if there are any intersector correlations. This analysis showed that individual sector stocks are mostly correlated, however, the individual sector stocks do not show a relationship with common sectors. The data used is monthly data of the individual stocks from 31 January 1999 to 30 June 2018. The study takes into consideration that the period is post the Asian Contagion and during the dot.com bubble. Also considered is the Global Financial crisis that occurred in 2007/2008. The study period thus allows enough time for market corerction. The study utilises the conventional unit root tests; the augmented Dickey-Fuller (ADF), Phillips- Perron (PP) and the Kwiatkowski–Phillips–Schmidt–Shin (KPSS) tests. Also utilised are modified unit root tests of Elliot, Rothenburg and Stock (ERS) (1996) as well as Ng and Perron (2001). Due to criticisms of the initially utilised unit roots, the nonlinear test of Kapetanois et al. (2003) and the Flexible Fourier form (FFF) is employed. Based on the empirical analysis, the study demonstrates that although the studies received conflicting evidence the FFF demonstrates the most “power” of the tests, thus is deemed to provide more accurate results. This test provided evidence of stationarity in the JSE market, thus implying inefficiency. The results were different for only two of the forty stocks, namely, Shoprite and Bidvest which implied efficiency. The study thus found that the EMH is not relevant to the current South African market and other theories should be considered in analysing the market. This also provides a case for behavioural finance to be analysed, as the assumption that all investors are rational is questioned.
- Full Text:
- Date Issued: 2019
- Authors: Nomatye, Anelisa
- Date: 2019
- Subjects: Stocks -- Prices -- South Africa , Stock exchanges -- South Africa Stocks -- South Africa Johannesburg Stock Exchange Economic indicators -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/42825 , vital:36697
- Description: An efficient stock market is characterised by prices that are reflective of all the information such that there are no opportunities for arbitrageurs. In an efficient market, it is impossible to beat the market, therefore it follows that stock prices in an efficient market should follow a random walk. This study investigates whether the Johannesburg Stock Exchange (JSE) is an efficient market using the JSE Top 40 listed stocks, thus the relevance of the EMH in the current South African market is analysed. A corerlation analysis is undertaken to find whether the individual stocks in the different sectors are correlated in their returns, or if there are any intersector correlations. This analysis showed that individual sector stocks are mostly correlated, however, the individual sector stocks do not show a relationship with common sectors. The data used is monthly data of the individual stocks from 31 January 1999 to 30 June 2018. The study takes into consideration that the period is post the Asian Contagion and during the dot.com bubble. Also considered is the Global Financial crisis that occurred in 2007/2008. The study period thus allows enough time for market corerction. The study utilises the conventional unit root tests; the augmented Dickey-Fuller (ADF), Phillips- Perron (PP) and the Kwiatkowski–Phillips–Schmidt–Shin (KPSS) tests. Also utilised are modified unit root tests of Elliot, Rothenburg and Stock (ERS) (1996) as well as Ng and Perron (2001). Due to criticisms of the initially utilised unit roots, the nonlinear test of Kapetanois et al. (2003) and the Flexible Fourier form (FFF) is employed. Based on the empirical analysis, the study demonstrates that although the studies received conflicting evidence the FFF demonstrates the most “power” of the tests, thus is deemed to provide more accurate results. This test provided evidence of stationarity in the JSE market, thus implying inefficiency. The results were different for only two of the forty stocks, namely, Shoprite and Bidvest which implied efficiency. The study thus found that the EMH is not relevant to the current South African market and other theories should be considered in analysing the market. This also provides a case for behavioural finance to be analysed, as the assumption that all investors are rational is questioned.
- Full Text:
- Date Issued: 2019
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