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Blockchain unpacked

Blockchain is generally associated with Bitcoin and other cryptocurrencies, but these are just the tip of the iceberg, says ESET Southern Africa.

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This technology was originally conceived in 1991, when Stuart Haber and W. Scott Stornetta described their first work on a chain of cryptographically secured blocks, but only gained notoriety in 2008, when it became popular with the arrival of Bitcoin. It is currently gaining demand in other commercial applications and its annual growth is expected to reach 51% by 2022 in numerous markets, such as those of financial institutions and the Internet of Things (IoT), according to MarketWatch.

What is blockchain?

A blockchain is a unique, consensual record that is distributed over multiple network nodes. In the case of cryptocurrencies, think of it as the accounting ledger where each transaction is recorded.

A blockchain transaction is complex and can be difficult to understand if you delve into the inner details of how it works, but the basic idea is simple to follow.

Each block stores:

–           A number of valid records or transactions.
–           Information referring to that block.
–           A link to the previous block and next block through the hash of each block—a unique code that can be thought of as the block’s fingerprint.

Accordingly, each block has a specific and immovable place within the chain, since each block contains information from the hash of the previous block. The entire chain is stored in each network node that makes up the blockchain, so an exact copy of the chain is stored in all network participants.

As new records are created, they are first verified and validated by the network nodes and then added to a new block that is linked to the chain.

How is blockchain so secure?

Being a distributed technology in which each network node stores an exact copy of the chain, the availability of the information is guaranteed at all times. So if an attacker wanted to cause a denial-of-service attack, they would have to annul all network nodes since it only takes one node to be operative for the information to be available.

Besides that, since each record is consensual, and all nodes contain the same information, it is almost impossible to alter it, ensuring its integrity. If an attacker wanted to modify the information in a blockchain, they would have to modify the entire chain in at least 51% of the nodes.

In blockchain, data is distributed across all network nodes. With no central node, all participate equally, storing, and validating all information. It is a very powerful tool for transmitting and storing information in a reliable way; a decentralised model in which the information belongs to us, since we do not need a company to provide the service.

What else can blockchain be used for?

Essentially, blockchain can be used to store any type of information that must be kept intact and remain available in a secure, decentralised and cheaper way than through intermediaries. Moreover, since the information stored is encrypted, its confidentiality can be guaranteed, as only those who have the encryption key can access it.

Use of blockchain in healthcare

Health records could be consolidated and stored in blockchain, for instance. This would mean that the medical history of each patient would be safe and, at the same time, available to each doctor authorised, regardless of the health centre where the patient was treated. Even the pharmaceutical industry could use this technology to verify medicines and prevent counterfeiting.

Use of blockchain for documents

Blockchain would also be very useful for managing digital assets and documentation. Up to now, the problem with digital is that everything is easy to copy, but Blockchain allows you to record purchases, deeds, documents, or any other type of online asset without them being falsified.

Other blockchain uses

This technology could also revolutionise the Internet of Things  (IoT) market where the challenge lies in the millions of devices connected to the internet that must be managed by the supplier companies. In a few years’ time, the centralised model won’t be able to support so many devices, not to mention the fact that many of these are not secure enough. With blockchain, devices can communicate through the network directly, safely, and reliably with no need for intermediaries.

Blockchain allows you to verify, validate, track, and store all types of information, from digital certificates, democratic voting systems, logistics and messaging services, to intelligent contracts and, of course, money and financial transactions.

Without doubt, blockchain has turned the immutable and decentralized layer the internet has always dreamed about into a reality. This technology takes reliance out of the equation and replaces it with mathematical fact.

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AppDate: DStv taps Xbox, Hisense

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DStv Now for Xbox and Hisense

Usage of DStv Now, the online DStv service available free to DStv customers, is increasing rapidly with more than two million plays of live and Catch Up content per week. In addition to using DStv Now to watch TV on tablets and smartphones, an increasing number of DStv customers are also opting to use it as their primary method of getting DStv on additional TVs in the house. This is set to increase with the release of two new big-screen TV apps, one for Xbox gaming consoles (Xbox One, Xbox One S, Xbox One X) and another for Hisense smart TVs (2018 and newer models).

Expect to pay: A free download.

Platform: Any of the Xbox One range of gaming consoles and 2018 or later Hisense smart TVs.

Stockists: Visit the store linked to your Xbox console or HiSense smart TV.

Santam Safety Ideas

Start-up businesses that have a FinTech or InsurTech business venture brewing are called to enter the third annual Santam Safety Ideas competition. Safety solutions or InsurTech ventures that are ready for piloting could win up to  R150 000 worth of incubation support and R200 000 in seed funding. 

The Safety Ideas competition was launched two years ago in partnership with LaunchLab,  Stellenbosch University’s startup incubator that facilitates valuable connections for corporates and startups sourced from the startup ecosystem and partner universities in South Africa. The previous winners are Herman Bester and Anton Swanevelder, co-founders of MyLifeLine – a wearable panic device that won the competition last year; and Ntsako Mgiba and Ntandoyenkosi Shezi, co-founders of Jonga – a cost-effective security system for low income families, which won the competition in 2017.

Entries close on 28 February 2019. For more information on how to enter, visit: www.santam.co.za/safetyideas/

Click here to read about the FNB Snapchat lens, Spotify Free with data saver, and 00:37.

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Fortnite fixes hackers’ hole

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Epic Games has repaired a vulnerability that exposed Fortnite, the world’s most popular game of the moment, to hackers. The hole, which was left in Epic’s web infrastructure,  allowed hackers to target players with email that appeared to come from Epic Games, but would have led them to a phishing site, where their log-in details would have been stolen.

Researchers at cyber security solutions provider Check Point Software alerted Epic to vulnerabilities that could have affected any player of the hugely popular online battle game.

Fortnite has nearly 80 million players worldwide. The game is popular on all gaming platforms, including Android, iOS, PC via Microsoft Windows and consoles such as Xbox One and PlayStation 4.  In addition to casual players, Fortnite is used by professional gamers who stream their sessions online, and is popular with e-sports enthusiasts.

If exploited, the vulnerability would have given an attacker full access to a user’s account and their personal information as well as enabling them to purchase virtual in-game currency using the victim’s payment card details. The vulnerability would also have allowed for a massive invasion of privacy, as an attacker could listen to in-game chatter as well as surrounding sounds and conversations within the victim’s home or other location of play. 

While Fortnite players had previously been targeted by scams that deceived them into logging into fake websites that promised to generate Fortnite’s ‘V-Buck’ in-game currency, these new vulnerabilities could have been exploited without the player handing over any login details.

Click here to read how the Fortnite hack would have worked.

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