Is 7zip safe - viable solutions
Is 7-Zip a virus?
While 7-Zip may sound like a good name for a PC virus, it's actually a legitimate utility that compresses and decompresses files. It also comes with a built-in file manager that helps you manage those files.
This episode of SciShow might get you a little paranoid about computer viruses and internet security. But that's probably a good thing. When we talk about a computer virus, we usually mean any type of code designed to do harm and spread to more computers.
They are created by malicious programmers who may want to use your computer to attack other targets or make money by stealing your personal information. Or, you could just try to see how far your virus is spreading. Various viruses can attack Windows, Mac, and Linux computers, and even the data servers that run businesses and the Internet itself.
Antivirus programs help, but they can have trouble dealing with threats they have never seen before. Over the years, thousands and thousands of viruses have spread online, causing billions of dollars in damage from lost productivity, wasted resources, and broken machines. A few dozen of these viruses are noticed, some are spreading particularly quickly, have affected many people, or have a lot of their own Damage done.
Some have done all of this. Since many viruses were very bad in so many different ways, it's hard to tell which were objectively the worst. But with that in mind, here are 5 of those extra-destructive viruses.
These are snippets of code that changed the way people thought about computer security, both the people who create the viruses and the people who try to protect themselves from them. Let's say it's May 1999. You're an unsuspecting computer user who has never caught a virus, let alone trained to look for signs that an email might be malicious.
You are receiving an email from someone you know with a subject line that says “It is an important message to someone else,” with a winking emoticon. The attachment is a Word document called 'LIST'. So you click on it because you're curious ... and a list of porn sites pops up.
At this point you realize that the email was probably some kind of virus. But it's too late, the first 50 people in your address book have already received a copy of the same email with a subject line that says the message was from you. That was the Melissa virus.
It spread through Microsoft's Outlook email program, and although the attachment appeared to be an innocent Word document, it could infect computers through what is known as a macro. A macro is a special type of computer program that is used to create links to edit a document. Instead of manually making a bunch of changes to the document, a macro is a piece of code that lets you do everything with one click.
The problem is that functionality gives macros a lot of power over your computer. A macro that is actually a virus, like Melissa, harnesses this power with malicious code. In just a few days, Melissa spread to hundreds of thousands of computers.
It didn't harm the computers themselves, but it slowed email services and cost businesses about $ 80 million in total. Finally, IT pros and antivirus programs have taken security precautions to stop the virus by both preventing the emails from sending and by preventing them from reaching other people's inboxes when they have NOT sent. The programmer behind the virus, David L.
Smith, was caught about a week after Melissa was first released. He spent 20 months in jail and was fined $ 5,000. Why Melissa? Apparently that was the name of a stripper he'd met in Florida.
Melissa spread very quickly due to social engineering: it should make people curious enough to open the attachment. The ILOVEYOU virus, which spread about a year later, in May 2000, was also successful because of social engineering. It reached around 45 million computers in just two days and caused about $ 10 billion in damage.
The infected e-mail had the subject “ILOVEYOU” and came with an attachment with the title “loveletter for you.txt”. Attachments, the virus scanned the files on your system and searched for media such as documents, images and audio files.
Then he would overwrite them with copies of himself. So if you hadn't backed up your files, you would lose all of your data. In the meantime, the virus would spread to everyone in your address book.
ILOVEYOU was a type of virus known as a worm which means it was a standalone program that didn't use a host program to run like Melissa used Microsoft Word. It looked like a text document, so opening it seemed relatively harmless, but the “Loveletter for you” file was actually a file type called Visual Basic Script that uses the .vbs file extension at the end of the file name as the Windows operating system used to hide file extensions by default .
Visual Basic scripts send your computer a list of instructions to perform. So if they are supposed to cause harm, they can be very dangerous and, for example, delete all of your files. Like Melissa, the ILOVEYOU worm was mostly contained within a few days.
It was filtered from people's inboxes and companies posted fixes for infected machines. But a lot of damage had already been done. The virus was attributed to two programmers in the Philippines.
But even though they were both arrested, they were released because there were no laws against their actions at the time. ILVEYOU showed how easily and quickly a worm can spread and how much damage it can cause. In January 2003, just before 6 a.m., the Internet collapsed.
South Korea lost both the internet and cellular service. 300,000 people in Portugal could not connect to the internet. Airlines could not process tickets and had to cancel flights.
ATMs went out. Seattle 911 had to use paper to log calls. Even with many devices that were still connected to the Internet, connections suddenly became very slow, even for 2003.
So what happened? All this chaos was caused by a virus. But it wasn't the type of virus that spread through email or the type of computer that most people have at home. Slammer was a worm that targeted SQL servers that were storing databases with Microsoft software called ...
Microsoft SQL Server Exploiting a bug in the software: It sent the server specially formatted code that looked like an ordinary request for information, but it actually did reprogrammed the server to send more copies of the same worm. The worm spread faster than any other virus, infecting 75,000 servers in just 10 minutes. These servers all sent requests to thousands of other servers that couldn't handle all of the traffic.
In total, millions of servers were affected and the internet broke. It is believed that Slammer caused about $ 1.2 billion in damage before it was stopped, and the programmer behind it was never caught.
The whole mess could have been prevented, however, six months earlier, Microsoft released a fix for the bug Slammer was exploiting, but a lot of people just hadn't installed it yet. The 2007 Storm Worm was another worm that spread via email. However, its purpose was not to destroy your computer or information, but to take over your computer.
The original subject line was '230 people killed in assaults on Europe,' which is where the virus got its name from. The email contained a link to a website that immediately downloaded the virus onto the user's computer. And then ... nothing happened.
Or at least nothing that the user could see. The storm worm was designed to be as invisible as possible so that you don't spot and destroy it. That way, it was able to use your computer for all sorts of things in the background.
The virus would connect your computer to what is known as a botnet, a collection of computers that form a network. A botnet can do anything from coordinated attacks that slow down or disable the web servers that keep a company running, to stealing passwords, banking and identity information. But at first the network didn't really do much, it just grew.
Antivirus and IT companies knew it was there, but it was hard to stop. For one thing, different machines in the network had different tasks. Only a small fraction of the infected computers were responsible for spreading the virus.
Another small group of computers served as command and control centers, sending instructions and helping control the rest of the botnet. The rest just followed these directions. Even if you shut down most of the computers that were spreading the virus, the network would still be out there doing its job.
But it was difficult to prevent the stormworm from spreading in the first place. Sure, it started out as an email about a storm in Europe, but soon there were emails with all sorts of headlines. And since they came from someone in your address book, they looked relatively innocent.
To make matters worse, antivirus programs had trouble finding the virus on an infected computer. The code for Storm Worm should change every half hour, so it always looked different. At its peak, the Storm Worm's botnet consisted of around 1.5 million machines.
However, the programmers didn't seem to use it for nefarious purposes, they simply sold the network to other criminals and scammers. After a while, companies figured out how to stop the virus from spreading. They removed it from infected computers, and by the end of 2008 the botnet was largely gone.
But like with Slammer, the people behind it were never caught. Mebroot is also a virus that slowly spread in 2007. And its main goal was also to get you hooked up to a botnet called Torpig, both of which are particularly sophisticated; mebroot usually gets into your computer via a drive-by download where you visit a malicious website and the program is downloaded in the background, without you noticing.
From there, it overwrites what is known as the Master Boot Record, the part of your computer's hard drive that stores the instructions that tell your computer how to start it up. The ability to control the master boot record gives mebroot a lot of power because it can tell your computer what to do right from the start. And what it tells your computer is to connect to the torpig bot network ... which then steals all of your information.
Torpig uses a spying technique called man-in-the-browser that is as creepy as it is nds. It lurks in your browser and logs everything you do and any private information you randomly enter. It will also try to actively stealing information by using fake websites that look and act just like the originals but send the data to the Torpig servers instead.
And all the while, you would never know it was there. By late 2008, Torpig had stolen information on 500,000 bank accounts, and again the people who created them weren't caught. By now you might be wondering whether a worm will bring the Internet to a standstill tomorrow or whether your computer is secretly part of a botnet.
And I don't really blame you. There are things you can do to avoid viruses: Install an antivirus program. Don't click on suspicious links or emails from Nigerian Prince.
Keep your operating system and computer programs updated with the latest security patches. Computers are great, but they just do what they're told and when viruses tell them to do bad things it can do a lot of damage SciShow, presented by our patrons on Patreon. If you'd like to support the show, just go to patreon.com/scishow.
And don't forget to go to youtube.com/scishow and subscribe!
Is 7z safer than zip?
7z file extension is a lot more secure. And no email providers can open it easily. This, however, is a different case with RAR or ZIP. Since the majority of email providers today snoop into RAR, ZIP and other compression formats, if ever there are executable files compressed in it, it can't be sent through email.
Is 7-zip safe Reddit?
7-zip is just a file compression program. The program in it's self is totally safe, what is contained in some archives might not be.
Is 7zip legal?
You don't need to register or pay for 7-Zip. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
Before we begin, I would like to thank Jason Scott for his work on BBS the Documentary. It was published in 2005 and serves as a great historical record of the Bulletin Board Systemera excerpts from its documentation in this article, I'm sure most of us used the PKZIP and PKUNZIP programs to compress and compress our files in the 90s The ZIP format was written by Phil Katz and quickly became the standard for IBM PC Compatibles, but there is a bitter backstory to it and to explore it we must first start in 1952. // Huffman Coding // Yessss, in 1952, while studying information theory at MIT, David A.
Huffman wrote a paper on finding the most efficient binary code. His work has sacrificed speed for size and gave us a standard method of data compression. Explained very quickly, it's a compression method that cuts up all the common bytes of data, assigns them to a binary tree in descending order of frequency, and then by providing a means of untangling the data depending on which side of the tree it falls on, allows anyone to do it Characters to take up less than the usual 8 bits or a byte that it normally would.
Fast forward to the 80s, and with bulletin board systems growing in popularity, it is perfectly clear that there needs to be a more efficient way of moving files over the tediously slow and expensive system of modem-to-modem communications. Thom Henderson and Andy Foray, who founded a computer consultancy in the early 1980s that they would later call Software Enhancement Associates, or SEA, which operated out of New Jersey. Thom had a background as a seaman so this became an integral part of the logo.
Your work really only began with the bulletin boards that appeared at the time. FidoNet; A worldwide computer network used for communication between bulletin boards was in its infancy then, and so Thom and Andy began developing software to expand it. They worked on the SEADOG software, set up the KITTEN BBS and really enabled Fidonetto to expand exponentially by working on the mailer software and Echomail, which enable a store-and-forward messaging system similar to the USENet.
But the real breakthrough for SEA was the creaking of a program called ARC in 1995. A compression utility that drew heavily on Huffman's freely published work. This software, distributed as shareware, has quickly become the de facto standard for compression and decompression not only on bulletin board systems, but also on MS-DOS and other business-critical machines.
Following the accepted practice from his previous work on mainframes, Thom would also make the source code for the software fully available. There were also competing products on the market, including ZOO, which is freely distributed and made by Rahu. l Dhesi.
This was another program that was developed from the ground up and gained quite a bit of popularity, but while ARC was free it was generally faster and offered better compression rates. Of course, ARC was free too, but as shareware, it urged users to pay for the software if they continued.Because the shareware model was relatively new at the time, contrary to what you'd expect some people had in the BBS scene actually has an aversion to SEA. big companies come and commercialize a scene that was mostly volunteers.
The irony is that SEA was a family business comprised of Thom's wife, Irene, Andy, and a single employee they hired to help develop the instigation to offer a friendly model that large corporations would soon be building on. Of course, not everyone felt that way, many users paid their shareware fee and even sent fan mails to SEA to sign up for the development of the software that saved them a bomb on phone charges. Enter PKWare operated by Phil Katz and appear to be taking SEA's market share by offering PKARC; an ARC compatible program that actually ran faster and offered a slightly cheaper model.
Especially if you were a company looking to get a commercial license. In Jason Scott's BBS documentary, various members of Fidonet were told about his appearance and Thom Henderson's initial reaction ... -Just across from your ad is an ad for PKARC.
Quote, 'the other ARC program', close quote. Dead silence on the line and he said say that again ...
I read it to him again ... so we went and got a copy of the magazine and oh, he was crazy.
In 1980 Phil Katz enrolled in the computer science program at the University of Wis-skon-sinMillwalkie Wisconsin-Milwaukee and immediately began writing programs and spending much free time with bulletin board systems. His strength seemed to be to create highly optimized code with the fewest instructions and thus the lowest runtime. Shortly after that we were working for Graysoft, a nearby software company, and in 1986 he had decided to start his own company, PKWARE, and shortly afterwards published PKARC written in C, PK was written partly in assembly language, and the compression algorithms were implemented so that they are incredibly fast compared to everything before.
This was important, especially for slower '80s PC hardware that bulletin board operators had to perform activities other than just compression and decompression. The PKXARC decompression program was released as a free utility that allows end users to decompress anything they downloaded, meaning that only people or bulletin boards who wanted to compress software would have to pay for the additional PK compression tool. Because of its speed, it quickly spread among users, especially since it could work with the exact same file format as SEA's ARC software.
The compression part, PKARC itself, was released as shareware shortly after that success, of course, after we both took the brunt and paved the way for this business model. It had never occurred to me that anything could have been going on there, and I'm not really sure if it was. From Phil's point of view, he had done nothing wrong.
He had taken readily available code, improved it, and sent it to the wild. This earned him a much higher income than his job at Graysoft, and so he stopped serving PKWARE from his mother's kitchen table. Another former Graysoft programmer, Steve Burg, was quickly brought on board to help with continued development, I've only followed accepted practices for you to do this.
You post it, you declare copyright, if someone infringes you, you send a cease and desist. Complaining wasn't our first choice. SEA had previously tried to smooth things over with Katz; in December 1987, Thom had contacted Phil Katz and simply asked him to pay royalties for PKARC and PKXARC, but Katz simply refused.
Phil Katz pretty much told us to get lost. He said his work was completely original, it had absolutely nothing to do with anything we had ever done. Only he and his mum made up the way it sat at the kitchen table, with no resemblance.
Pure random. So, since this was going nowhere ...
SEA went the only way open to them. To protect both their intellectual property and income, they sued Katz for trademark and copyrights in May 1988 // Now when you write code, you tend to leave comments in the source code for you or someone else to have a look . You can quickly see which parts are responsible for what.
It was these comments that provided the most likely evidence that Katz had simply stolen the source code from SEA. It was accurate, including the misspellings. Because my brother wrote part of that code too and he can't spell it to save his life.
I mean the misspellings were exactly the same. He had made no effort to remove them, and Thom and Andy's comments, including the misspellings, remained scattered throughout the PKARC code. Given that shareware can generally be copied but not used or resold in other shareware offerings, this should have been a clear case, but it quickly turned out that this wasn't a war of right or wrong.
It was now a war of perception, propaganda, and the BBS community quickly turned against SEA perceived as 'the little guy' with PKWARE ...
Everyone backed Phil Katz back then because he was the little one, and SEA was the one big brother no one had anything to do with. But it was like a David and Goliath thing, is how I noticed it. - On all the systems out there, everyone urged not to buy SEA software and to stand behind Phil Katz.
This happened even though both companies were very family based business models of very similar size and if anything, Phil makes more mo ney than SEA were. In an interview with PC Week, Katz said, 'We're a small company. Any kind of litigation is a burden. ' But the anger didn't just come from the perception of attacking the little guy.
SEA was trying to retrospectively declare ARC to be a closed and proprietary format. Of course it was, but the means by which it felt like a community good worked very against it at the time. A newsgroup message from Keith B.
Petersen, broadcast on June 14, 1988, appeared to calm and express people's feelings; 'This is really amazing! SEA is suing Phil Katz, the author of PK (X) ARC. I'm so mad that I'm deleting all copies of SEA's ARC program. It's time to send Phil your support for his hugely superior archiving program.
I'm sending my check today - for an amount greater than the amount he suggests (his program is free for non-commercial purposes). Keith Petersen Supervisor of the CP / M and MSDOS archivesat SIMTEL20.ARPA'It is clear that SEA was not actually out to destroy car goods here.
They just wanted to draw a clear line between right and wrong in the future, they wanted to get the facts straight, but in doing so they had made the PR mistake of being an aggressive party and shooting themselves in the foot, and on August 2nd, 1988 they came to an agreement to come to an agreement with Katz. Katz would have to pay $ 22,500 for past license payments and $ 40,000 for reimbursement of expenses. In the future, he would also pay a license fee of 6.5% of all revenues for ARC-compatible programs.
Thereafter, PKWARE released a definitive version of PKARC and PKXARC, which was renamed PKPAK and PKUNPAK before being abandoned and focused on a different compression format. That format would be the .ZIP format, with the PKZIP and PKUNZIP programs supporting it.
Shortly after the creation of PKZIP, Katz published the specification APPNOTE.TXT, which documented the ZIP file format and stated that it could always be implemented free of charge for competing software. Katz's support already d, in combination with it, meant that ZIP quickly became the de facto compression standard.
For both bulletin boards and MS-DOS-based PCs. This resulted in PKWARE becoming a multi-million dollar company. Though Phil's stubborn opposition to Microsoft Windows led to PKWARE itself, it would miss out on being the first to bring compression to the platform - what else does it do? a few more tricks I guess.
Well we have several compression related products. One of our newer products is a data compression library that enables any programmer to incorporate our compression technology into their application program. SEA never recovered from the poor PR they received during this process, and SEA was sold to a Japanese company in 1992, one line under all the endeavors for Thom and Andy.
OK, let's talk about modern programming and SkillShare. SkillShare has been a great sponsor for this channel and I've enjoyed many classes including Ali Abdaal's Productivity Master Class. I mean, how do you think I've done so many articles lately? But one thing I really like, Creative Coding: Animating SVG with simple CSS from Aga Naplocha, and not just because it includes a pretty neat keyboard.
Part of the web development I've never really gotten to grips with animation, but here is they are sleek, simple, and designed the way you'd expect from Skillshare, and SkillShare is giving away 2 free months of Premium Membership to the first 1000 people who click the link in the Description box that helps you explore your creativity, and then it's it only about $ 10 a month. This is not a happy story for everyone involved. Phil Katz was always plagued by his life, but he further descended into alcoholism in the mid-1990s and died on April 14, 2000 at the age of only 37 in a Milwaukee hotel room. ** Sadly, Andy Foray also died in 2014 after a long battle with Melanoma ESVAnet, a local internet service provider for the ea sternshore, which is a much less complicated job than the world of bulletin board systems 0: 16: 00.920,1193: 02: 47.295. ** PKWare was originally sold to investment bank Grace Matthews in 2001 and was continued by George Haddix before being sold to Ascent Solutions.
Still specializing in data compression, they switched to data protection and encryption in 2009, which they still specialize in today. Of course, most of us use ZIP files on a daily basis. In emails, downloads, even just compressing files on our desktop, with the ARC format mostly being a distant memory.
I recommend checking out the BBS documentation for a deeper understanding of the whole world of bulletin boards. As usual, the links are below. Thanks for watching.
Have a nice evening.