WEB APPLICATION AND SECURITY (CBSE CLASS X IT(402)) NOTES

 

WEB APPLICATIONS AND SECURITY

Computer Accessibility refers to the user friendliness of a computer system for all, regardless of their disability. it enables a person with a disability or impairment to use a computer. It is known as Assistive Technology. There are numerous types of impairment that impact computer usage. These include:

1.   Cognitive impairments and learning disabilities

2.   Attention Deficit Hyperactivity Disorder (ADHD) or autism.

3.   Visual impairment.

4.   Hearing impairment

5.   Motor impairment

Launching Accessibility Options :

To launch accessibility options in Windows 7, Click Start > Control Panel > Accessibility Options.

Various tabs in Accessibility Option Window :

Keyboard Tab to configure accessibility options for Keyboard is displayed

1) Sticky Keys : Sticky Keys is an accessibility feature to help computer users with physical disabilities, but it is
also used by others as a means to reduce repetitive strain.

2) Filter Keys : Filter Keys is a feature of Microsoft Windows. It is an accessibility function that tells the keyboard to ignore brief or repeated keystrokes, making typing easier for people with hand tremors.

3) ToggleKeys : ToggleKeys is an accessibility function which is designed for people who have vision impairment or cognitive disabilities. When ToggleKeys is turned on, computer emits sound cues when the locking keys (Caps Lock, Num Lock, or Scroll Lock) are pressed.

Sound Tab to configure accessibility options for sound is displayed.

1) SoundSentry : SoundSentry is designed to help users with auditory impairments. SoundSentry generates visual warnings, such as a blinking title bar or a flashing border, whenever the computer generates a sound.

2) ShowSounds : ShowSounds instructs applications that convey information by sound, to also provide information visually, through text captions or informative icons.

Display Tab to configure accessibility options for Display is displayed.

1) High Contrast : High Contrast is an accessibility feature to assist people with vision impairment. You can change the size and color of fonts and the background for ease of viewing.

2) Cursor Options : Cursor Options is also an accessibility feature that assists people with vision impairment
by changing the blink rate and width of the cursor.

Mouse Tab to configure accessibility options for Mouse is displayed.

1) MouseKeys : MouseKeys is an accessibility feature that assists people who have difficulty using a mouse. This option uses the keyboard (especially numeric keypad) as a pointing device instead of a mouse.

General Tab : enables you to configure accessibility options for all users.

1) Serial Keys : Serial Keys is an accessibility feature that assists people that have difficulty using a keyboard or a mouse (or both). They can use special devices such as Sip, Puff and Breath Switches to provide input to the computer through Serial Ports.

SESSION 2 : NETWORKING FUNDAMENTALS

A computer network is a collection of computers and other hardware components interconnected by communication channels (cables or satellites) that allow sharing of resources and information.

Networks are designed using the following architecture:

1) Peer-to-Peer (P2P) Architecture : Networks in which all computers have an equal status are called peer to peer networks. Generally in such a network each terminal has an equally competent CPU.

2) Client-Server Architecture : Networks in which certain computers have special dedicated tasks, providing services to other computers (in the network) are called client server networks. The computer(s) which provide services are called servers and the ones that use these services are called clients.

TYPES OF NETWORKS :

1) Local Area Network : A local area network (LAN) is one which connects computers and devices in a limited
geographical area such as home, school, computer laboratory, office building.

2) Metropolitan Area Network : A Metropolitan Area Network (MAN) is one which connects computers and devices in a single city or a town.

3) Wide Area Network : A wide area network (WAN) is one which covers a broad area (i.e., any network that links across metropolitan, regional, or national boundaries).

Advantages of Networking :

1) Data Sharing : Networking allow the sharing of data .

2) Files Transfer : One User can send text files, spread sheets etc. to other users.

3) Hardware Sharing: Hardware components such as printers, scanners, etc. can also be shared.

4) Internet Access Sharing: You can purchase a single Internet connection and share it among other computers in a network

Internet :

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide. It is a network of networks.

Uses of Internet : There are various uses of Internet. Some of them are listed below

1.   Internet is used by students, educational institutes to gather information for research.

2.   It is used for online shopping.

3.   It is used for sending and receiving mail.

4.   It is used for playing games.

5.   It is used for Online Transaction.

World Wide Web : World Wide Web (abbreviated as WWW or W3, commonly known as the Web), is a
system of interlinked hypertext documents accessed via the Internet.

Web Browser : A Web Browser is a software used to view Web sites and acts as an interface between the user and the World Wide Web.

Web Server : Web server is a computer that stores web sites and their related files for viewing on the Internet.

Internet Service Provider : An Internet service provider (ISP) is an organization which provides you with access to the Internet via a dial-up (using modem) or direct (hard wired) or wireless connection. for example Bharat Sanchar Nigam Limited (BSNL), Airtel, MTS, Vodafone, Tata Docomo, etc.

Modem : It stands for MOdulator/DEModulator. It is a device that converts digital computer signals into a form analog signals and vice versa.

Types Of Common Internet Connectivity : There are different types of Internet Connectivity available today; it can be widely categorized into wired and wireless access.

Technology		Type of Connectivity
Dial-up		Wired
DSL		Wired
Cable Internet Access		Wired
3G		Wireless
WiMAX		Wireless
Wi-Fi		Wireless

Some of the commonly used Internet connectivity are:

1) Dial-up connections are extremely slow and in most cases, it is replaced by a high speed connection such as DSL or Cable Modem.

2) DSL: Digital subscriber line(DSL) provide Internet access by transmitting digital data over wires of a local telephone network.

3) Cable Internet Access: Cable Internet Access is a form of broadband Internet access that uses the cable television infrastructure.

4) 3G: 3G, short for 3rd Generation is a set of standards used for mobile devices.

5) WiMAX: WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communications standard designed to provide mobile broadband connectivity across cities.

6) WI-Fi : Wi-Fi (Wireless Fidelity) is a popular technology that allows an electronic device such as computers or mobile phones to exchange data wirelessly over a network.

SESSION 3: INTRODUCTION TO INSTANT MESSAGING

Instant messaging (IM) is a form of communication over the Internet that offers an instantaneous transmission of text-based messages from sender to receiver.

Types of Instant Messaging Software : There are two kinds of instant messaging software – application based and Web based.

A) Application based : Application based instant messaging software is downloaded and installed on user’s computer. Some of the popular instant messaging software are:

1.   Google Talk

2.   Yahoo! Messenger

3.   Skype

4.   Windows Live Messenger

5.   Rediff Bol, etc.

B) Web based : Web based instant messaging software is accessed using browsers such as Internet Explorer, Mozilla Firefox, Google Chrome, etc. Some of the popular web based instant messaging software are:

1.   Meebo

2.   Yahoo! Messenger for the Web

3.   MSN Web Messenger

4.   IMO, etc.

Key Features of an instant messaging are as follows:

1.   Text Messages can be sent to one or more person (Similar to SMS)

2.   Audio calling and conferencing.

3.   Video calling and conferencing.

4.   File transfers (Not limited to documents, spread sheets, audio files, video files, etc.)

5.   Message history (Save messages for future reference).

NOTE : To use instant messaging software, a user must have a valid instant messaging account.

SESSION 4: CHATTING WITH A CONTACT – GOOGLE TALK

Google Talk : Google Talk is an instant messaging service that provides both text and voice communication developed by Google Inc. Google Talk can also be used for making video calls. Google Talk is free and is available as application based as well as web based. A Gmail account is required to use Google Talk.

Steps to Chat with a contact that is already added to your contact list.

a) Whenever your friend in the contact list is online you can see the person along with a green dot.

b) You can start sending text chat message instantly by double-clicking on a contact the other person will see the text message and respond to your message.

General rules and etiquettes to be followed while chatting :

1) Messages should be short and to the point.

2) Always introduce yourself by name if your screen name doesn’t reflect it.

3) Always ask if the other person has time to chat first.

4) Don’t Type your messages in uppercase as it seems to be extremely rude.

5) Give people time to respond.

SESSION 5: CREATING AND PUBLISHING WEB PAGES – BLOG

Blog : A blog is a discussion style site used by non-technical (or technical users) users for creating personal web pages. Blogs are similar to an online personal diary and simple to use.

Some of the popular websites that offer blog service for free are:

• www.WordPress.com
• www.blogger.com
• www.blog.com
• www.weebly.com
• www.blogsome.com

WordPress : WordPress is free web service that you can use to create a beautiful website or blog. WordPress has support for “themes” which can make the blog or the webpage look attractive.

How to create account in WordPress?

1) Open the Web Browser and type https://signup.WordPress.com/signup/.

2) Enter a unique address to your WordPress Blog. This is the address which others will use to view your blog.

3) Enter username and password to manage your blog.

4) Enter your Email Address and click on create blog.

5) An email will be sent (above mentioned email) for activating your blog account. Open your email and click on the activation link.

6) Now the blog is ready for use.

How to create post in WordPress?

1) Login to your WordPress Account.

2) To create a post, click New Post.

3) Type the title for your post.

4) Type the content which you want others to read. You can also add photos, videos, etc. to the blog using the options available in WordPress

5) Once you have finished typing the content, Click Publish Post to publish your content. This process is called posting content.

SESSION 6: USING OFFLINE BLOG EDITORS

Offline Blog Editors :

Those Editors in which we can create blog when we do not have an active internet connection and publish the blog whenever internet connectivity is available are called Offline Blog Editors.

There are several free offline blog editors available such as :

1.   Qumana

2.   Windows Live Writer

3.   Blogdesk

4.   BlogJet

5.   MarsEdit

SESSION 7: ONLINE TRANSACTIONS

Online transactions : Online transactions deals with transfer of money over the internet. There are many benefits of online transactions like, fast transaction speed, convenience, low risk of theft etc.

Some of the popular online transaction websites are:

1) IRCTC(Indian Railway Catering and Tourism Corporation), an online portal for booking flight and train tickets.

2) Flipkart, an online shopping portal for buying consumer products. Flipkart offers multiple payment methods like credit card, debit card, net banking, e-gift voucher, and Cash on Delivery.

3) EBay, an online portal for buying and selling goods.

4) Redbus, an online portal for booking bus tickets.

Online shopping : Online shopping is a form of electronic commerce where customers can buy or sell goods
over the Internet.

Online shopping could be useful in situations when:

1) A customer does not have sufficient time to visit stores.

2) Visiting a store is more expensive than purchasing a product online.

3) A product or service that is not available in the local market is available online.

SESSION 8: INTERNET SECURITY

Internet security : Internet security is a branch of computer security specifically related to the Internet. Its objective is to establish rules and measures to use against attacks over the Internet.

Best Practices for Security :

1) Use strong password and keep on changing after every 2 -3 weeks.

2) Use encryption software to protect your data from unauthorized users.

3) Never save your username or password on shared computers.

4) Do not share personal information.

5) Use updated antivirus and antispyware software.

6) Clear browser cookies frequently.

7) Keep the operating system and software applications up to date.

8) Install Firewall : Firewalls analyse the network traffic and determine if the traffic should be allowed or not.

9) Never install software from unknown sources.

10) Remove unwanted or unknown software applications: These might have got installed without your knowledge when you have visited some websites.

11) Clear Data Stored In Browsers : It is not advisable to leave the web browser store data(username, password, credit card detail) particularly on public or shared computers.

General guidelines for managing strong passwords are :

1.   Keep the length of the password at least 12-14 characters if permitted.

2.   Avoid keeping passwords based on repetition, dictionary words, letter or number sequences, usernames, relative or pet names, etc.

3.   Including numbers, and symbols in passwords if allowed.

4.   Use capital and lower-case letters.

5.   Avoid using the same password for multiple sites or purposes.

6.   Avoid using something that the public or workmates know you strongly like or dislike.

NOTE :

1.   www.strongpasswordgenerator.com help to generate strong password.

2.   Example of Online threats are Phishing, email spoofing, chat spoofing, etc.

3.   Combination of alphanumeric and special characters could be used for creating a password that is not so easy to crack.

4.   Programs such as keyloggers track and transmit every key that is pressed on a keyboard (keystrokes) to unauthorized users

SESSION 9 : MAINTAIN WORKPLACE SAFETY

Every organization must follow a standard set of safety rules and procedures. These rules must be stated and displayed clearly at important areas . All the employees must be given a demonstrations and training to follow safety rules.

BASIC SAFETY RULES ARE GIVEN BELOW

A) Basic Fire safety rules in an organization are :

1) Fire escape plans must be installed at proper levels

2) Conduct regular drills

3) Smoke alarms must be placed at proper intervals

4) Keep workplace a no-smoking zone

5) Maintenance of safety equipment must be taken care of regularly

B) Falls and Slips Safety rules

1) Keep the moving area clean and clutter free.

2) Workplace must be proper ventilated receive light.

3) Wear non slippery footwear.

4) Floors must be clean and dry

5) Oil spills, dust must be immediately cleaned.

C) Electrical Safety Rules:

1) Electrical equipment used should be approved by a recognised organization.

2) Workers should be trained to handle the electric equipment safely.

3) Damaged and hazardous electrical equipment should be immediately replaced.

4) Heat emanating equipment should be kept away from the electrical equipment.

What is First Aid?

First Aid is the immediate assistance provided to the injured to save life and minimize health loss till the proper medical aid/ facility is provided.

Some rules of First Aid are :

1.   Assure the injured to remain calm and not to panic.

2.   Keep them warm if they are under shock

3.   Do not move the victim in case of back/neck injury

Occupational hazard : An occupational hazard is the illness one may acquire due to his occupation. Some types of occupational hazards are : Physical hazards, chemical hazards, biological hazards, , behavioural hazards, radiological hazards, ergonomic hazards etc.

SESSION 10 : PREVENT ACCIDENTS AND EMERGENCIES

Accident : an accident is an unplanned event that may happen all of a sudden and may lead to unwanted or unprecedented results/outcomes.

Types of Accidents: Accidents may be of following types :

1.   Accidents at workplace : Slips and fall accidents, fire

2.   Industrial disease/illness

3.   Road traffic accidents

4.   Clinical Accidents

5.   Sports related accidents

Handling Accidents:

Accidents must be handled carefully. The accident should be handled compassionately without assigning blame on others.

1.   Every organization must follow SOP for accident handling

2.   Safety measures must be placed to prevent workplace accidents

3.   Immediately call the medical team for any injury

4.   Stay alert

5.   Pay attention to and follow emergency drills

Emergency : Any unexpected situation that needs immediate attention and action is called emergency.

An emergency situation is one that:

1.   threatens the employees, customers or the public

2.   disrupts or shuts down the operations

3.   causes physical or environmental damage

Types of Emergency :

Various types of emergencies are there and there should be an emergency management plan to handle the situation of emergency. Some of the types of emergencies are as follows :

1.   Chemical spills

2.   Extreme heat waves

3.   Droughts

4.   Pandemics

5.   Terrorist attack

6.   Fire

7.   Floods

8.   Thunderstorms

9.   Leakage of some hazardous gas/ chemical

Some of the types of emergencies that require evacuation are:

1.   Fire

2.   Explosion

3.   Floods

4.   Earthquake

5.   Hurricane

6.   Tornado

7.   Toxic material release

8.   Civil disturbance

9.   Workplace violence

SESSION 11: PROTECT HEALTH AND SAFETY AT WORK

Hazards And Sources Of Hazards :

A hazard is anything that is the source of any potential harm, damage or any kind of potential loss of health or life.

The different types of hazards include:

1.   Physical

2.   Chemical

3.   Biological

4.   Mechanical

Evacuation : Evacuation is the process of emptying a place in case of an emergency, disaster. Every company must ensure following points for evacuation in case of any emergency:

1.   An evacuation policy.

2.   Organization must have a designated assembly point for emergencies.

3.   Floor plans with evacuation routes pasted in work areas

4.   Periodic evacuation drills should be conducted

Healthy Living :

A healthy living has a lasting impact on an individual which ultimately yields a healthy environment at home as well as at work place.

A healthy lifestyle helps to keep and improve people’s health and well being.

A healthy lifestyle includes :

1.   healthy eating habits

2.   physical activities

3.   stress management

4.   healthy mind

5.   sound sleep

6.   goal setting