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Computer Security
Computer security is the prevention/detection of, and response to, any unauthorized actions by users of a computer system. Questions about security practices and principles belong here.
1,022 Questions
Encryption is used so that specific people, who have the key to the encryption, can read a given message, but other people who don't have the key can't read it. Sensitive information can thereby be sent to specific people while being concealed from the general public who might misuse it.
I can't access Facebook due to hackers attacking my email address?
Change your email address password to make it more secure, or send a request for help to facebook directly.
What malware types can scan the Internet for victims?
Well, I'm not really sure what you're asking, but I'll try to help!
As you probably know, there are many different kinds of malware out there; viruses, rootkits, botkits, trojans, spyware, adware, bloatware, etc.
To avoid infection:
1. Ensure you have an active antivirus and firewall running
2. Avoid opening suspicious files, email attachments, URLs (website links, especially true if it's from someone you don't know), and downloading the above mentioned items
3. If you are really paranoid about online privacy(like me), I recommend using Chrome or Firefox if you don't already, installing Albine's extension "Do Not Track Plus" (which stops tracking cookies from collecting your browsing history), and for good measure, I recently installed Keyscrambler and moved the system tray icon so that I could see it's working (it may install an addon, but I disabled that)
How can I change my user name and password on my computer when some one else changed it on me?
You can't. Go to a computer fixing shop or consult a hacker friend.
Is there a way to password protect a pen drive so nobody can open it without the password?
For Windows Vista and Windows 7
- Insert your pen drive which you want to password protect.
- Click start and open Control Panel.
- (Quick start : To skip the next three steps type BitLocker in the search box and hit enter.)
- Go to System and Security > BitLocker Drive Encryption.
- Find your pen drive listed amongst all the drives.
- Turn on Bitlocker for your pen drive. System will few seconds to turn this feature on.
- A window will open in front of you asking your desired password which you want to keep for your pen drive. Click next when you done with setting up the password.
- Store your recovery key at your desired place. Click next to continue. Recovery key can be used if in case you forget your set password.
- System will ask you to start encryption for your pen drive. Encryption will take some time.
- Once the encryption is over you will see a lock symbol on your pen drive icon.
- Remove the pen drive and re-insert it. System will ask you to enter the password to access the data.
What is primary goal of a rootkit?
It's used to try and hide or obscure the fact that a system has been compromised or hacked.
Is it illegal to copy the product key for a software from the internet and use it?
how can u settle ilegaly using a copy write
Are spam and hoaxes a part of Denial of Service attack?
increased non subjective emails ( e mail bombs) are the part of DDoS,
A "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service
which can rasie frequent mails like above one!
A DoS attack may include execution of
What are the risks of turning off messages from antivirus and system message?
You may not be informed when a malicious program is detected or when the antivirus needs updating. If your antivirus is out-of-date you may be prone to newer malware.
How do you delete the Myspace website off from your computer?
Websites are not stored on your computer. Only a history of those sites and related files are stored on your computer. However, if you wish to remove all traces of your history, just open your web browser, press Ctrl-Shift-Del, and choose all the relevant options. Alternatively, a free third-party solution, ccleaner, can also remove all related history quickly and easily.
What are the examples of Unclassified data?
Information that is in the public domain or has been specifically declassified by an authoritative body.
What is the default password of deep freeze?
there is no default password for deep freeze, just hold on shift key and double click on the icon of deep freeze at the bottom of task-bar and then the pop up menu of deep freeze tell you to enter password, just press Enter or OK, and then you able to put your new password.
What monitors and reports on changes in program code and unusual network activity?
Manager. The manager is the component or process the operator uses to manage the IDS. The IDS console is a manager. Configuration changes in the IDS are made by communicating with the IDS manager.
6 How can a computer use ARP to break security?
But if the gateway computer's knowledge of the destination computer's MAC address is either missing or too old and expired, it must send a broadcast to all of the computers on the LAN network asking which specific computer is assigned to the IP address of the packet the gateway is trying to forward. To do this the gateway broadcasts an ARP Request that will be received by every computer on the Ethernet LAN. The request simply asks for a reply from the one machine that is currently assigned to the IP contained in the request. Each computer on the LAN checks to see whether the IP is (one of) its own. The computer finding a match with (one of) its own IPs will send an ARP Reply back to the requesting device. When the gateway computer receives the ARP Reply, it has the MAC address of the replying computer along with the replying computer's IP address, contained in the reply packet. The receiving machine enters this information into a "cache" of all similar IP-address-to-MAC-address pairings which is maintained for every machine it has communicated with on the LAN. This is known as the machine's "ARP Cache" since it retains the history of all previous unexpired ARP Replies which it has received. Every computer participating on the LAN maintains its own similar ARP cache containing the IP-to-MAC relationships that allow them to properly address IP packets with Ethernet MAC addresses.
Notice that in this example, our gateway computer added this new entry into its ARP cache upon the receipt of an ARP Reply packet. The ARP protocol is so simple - just asking who has the IP and replying "I have the IP" - that there is no provision for any sort of security or authentication of the replying computer. In other words, any computer on the LAN could claim to have the IP in question. The implementation of the ARP protocol is so simple and straightforward that the receipt of an ARP reply at any time, even when there are no ARP requests outstanding, causes the receiving computer to add the newly received information to its ARP cache. Consequently, if the gateway computer were to receive a SPOOFED ARP REPLY from an attacking computer claiming that it was assigned an IP that belonged to some other computer, the gateway would trustingly and blindly REPLACE its current correct entry with the maliciously misleading replacement! If at the same time the malicious attacking computer were to send a similar ARP reply to the computer being hijacked, maliciously replacing the ARP cache entry for the gateway computer, then any subsequent traffic bound for the gateway would instead be sent to the attacking computer. If the attacker forwards any of the redirected traffic it receives onto the proper original computer - after inspecting and perhaps even modifying the data - neither of the intercepted computers will detect that all of their communications is now being relayed through an unknown and probably malicious intermediary computer. By merely injecting two ARP reply packets into a totally trusting LAN, any malicious computer is able to receive all traffic going back and forth between any two computers on the LAN such as any target machine and the LAN's gateway.
Can I change my iPhone password when my iPhone is stolen?
If you have Find My iPhone activated, you can put it in lost mode, wipe your memory, and a few other security functions. You can change your iTunes password online, but not your screen lock pin.
Probably the best choice would be to use AES (Advanced Encryption Standard) encryption with a 256 bit key size. There are actually at least 3 different key sizes that can be used with AES - 128, 192, and 256 bits. The longer keys require a little more computational overhead but are more secure. The AES ciphers have been analyzed extensively and are now used worldwide. AES was announced by NIST as U.S. Federal Information Protection Standard (FIPS) Publication 197 (FIPS 197) on November 26, 2001 after a 5-year standardization process in which fifteen competing designs were presented and evaluated before one was chosen to become "AES". The actual cipher chosen by NIST to be publicised under the appellation of AES was the Rijndael cipher submitted by two Belgian cryptographers, Joan Daemen and Vincent Rijmen. It became effective as a Federal government standard on May 26, 2002 after approval by the Secretary of Commerce. It is available in many different encryption packages. AES is the first publicly accessible and open cipher approved by the NSA for top secret information. AES can be implemented in software, but it also lends itself to hardware implementations. AES encryption chips allow much faster encryption of data since all the steps of the encryption are hardwired into the chip. The chips are not horribly expensive and the performance improvement versus software implementations of AES can make the price worth it.
SCIF is an acronym used by the US military to refer to a Sensitive Compartmented Information Facility. Typically access to such a facility requires a TS/SCI (top-secret special compartmented information) clearance specifically for the SCI (Sensitive Comparmented Information) being processed within the facility. SCI is not a "classification" so it is actually possible for information to be SCI but classified at the Secret or even Confidential level, although this is much less common than for Top-Secret information. SCI is based on the principle of "need-to-know" rather than the degree of damage that would occur if the information was disclosed (which is how Confidential, Secret, and Top-Secret classifications are assigned).
What are 3 risks determined from the analysis of information systems?
Answer: I will assume that your question pertains to corporate systems as opposed to home based PC systems. Internal Security: As most businesses currently rely on computerized systems in virtually all aspects of their operations, it is imperative to ensure that "down time" is kept to a minimum. While these systems have qualified technical staff to ensure that "down time" is kept to a minimum, US studies have shown that 68% of systems are not protected from natural or man-made disasters such as fire, floods, etc. Depending on a given business's requirement to maintain computer operations during the above described disasters, provisions should be made to have a remote mirror site which can be switched to if the primary site becomes inoperable. It's analogous to having a backup generator automatically kick in when there is a power failure. There are several third party companies that offer mirrored backup facilities. Information Security: While most companies take pride in believing that information that is stored on their computerized systems is well protected from all forms of unauthorized intrusion; such is not necessarily the case. While unauthorized access from the Internet is fairly tight, studies have shown that 22% of companies are vulnerable to unauthorized information access from within. Growth Management: The are several companies that anticipate substantial growth in the number of their employees and the scope of their operations, resulting in increased responsibilities for management and added pressure on these companies' operating and financial systems. To manage growth effectively, such companies must continue to improve their operational, financial and management information systems and will need to hire, train, motivate, and manage a growing number of employees. Unfortunately, very few companies take a proactive approach in ensuring that their computerized systems keep pace with both actual growth as well as anticipated growth. More often than not, many companies, virtually overnight, find themselves confronted with computerized systems that are unable to handle increased company growth as well as new requirements (i.e.: company decides to introduce a new product line, etc.). Under these circumstances, panic sets in and companies usually address this unpleasant situation by what's effectively termed as "management by crises".
What is the difference among CIF HD1 and D1 Resolution?
Good question.
I am assuming that you are asking about the various resolutions available on Q-See and other Video Recording devices such as Security Surveillance systems. Q-See and other manufacturers generally offer these 3 resolutions on their recording devices.
I had the same question, so I've done some research on the web. From what I can find out, this is the answer:
- NTSC: D1(720X480), HD1(720X240), CIF(360X240)
So, it depends on the clarity you want of the recording, and hence the playback. Of course, the higher the resolution, the more space is required on the recording Hard Disk of the unit. So, it depends on what you want for a Playback Quality vs the amount of space you are willing to commit on the Hard Drive inside the DVR.
Jim Livingston
Las Vegas, NV
Can you see what you searched on your internet bill?
Yes. It is a common feature usually enabled to catch young people viewing pornographic or inappropriate material.
Does any keygen have any effect on PC?
Some of them do add few spyware, malware.
Best to open a Keygen in a Sandbox (e.g. Sandboxie).
