information and communication technology abhishek s arackal
TRANSCRIPT
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Information and communication technology
Abhishek S Arackal
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Generations
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First generation
• 1940 – 56s• Vacuum tubes• Relied on machine language• Input on punch cards and paper tapes and
output on print out• Eg:- UNIVAC and ENIAC• expensive
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Second generation
• 1956 - 63• Transistor• Smaller and cheaper• Moved from binary to assembly language• Eg:- IBM 7094, IBM 1400 series
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Third generation
• 1964 - 71• Integrated circuits• Used keyboards and monitors• Eg:- IBM 370, UNIVAC 1108
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Fourth generation
• 1971 - 2010• Microprocessor• No air conditioning is required• All types of high level languages can be used• Eg:- Apple Macintosh and IBM PC
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Fifth generation
• 2010 – • Artificial intelligence• Understand natural human language• Can respond
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Inventions
• Vacuum tubes – John A Fleming
• Transistor – William Shockly, John Bardeen,Walter H Brattain
• ICs – Jack kilby, Robert Noyce
• Microprocessor – Marcian E Ted Hoff, Stanley Mazor
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Types of computer
Based on Principles1. Analog2. Digital3. Hybrid
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Analog
• Works on a continuous range of value• Deals with physical values like voltage,
pressure, temperature etc• Father – Lord Kelvin (William Thomson)
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Digital
• Uses Binary Number system• Only two digits 0 and 1• Each 1 is called a bit
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Hybrid
• Combination of both• Best used in hospital• Eg:- measuring heart beat
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Based on configuration1. Super2. Main frame3. Mini 4. Micro
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Super
• Expensive and fast• Weather forecasting, nuclear science,
aerodynamic modeling, seismology etc• Companies which produced Super computers
are Cray, IBM and Hewlett Packard.• Indian – EKA, PARAM, SAGA 220 Aaditya• First company introduced – Control Data Corp• Saga 220 - ISRO • Deep Blue defeat Garry Kasparove at chess
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• First super – Cary 1– 1960• First Indian – PARAM 8000• Fastest - Tianhe II• Fastest Indian – PARAM YUVA II
• Father of super computer – Seymour Cray• Father of Indian Super – Vijay Bhatkar
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Main frame
• Process data at a very high speed• 100s of millions instructions per second• Banking, Airlines, Railways etc
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Mini
• Lower to mainframe• Less expensive
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Micro
• It is single chip CPU• Types are desktop laptop handheld devices
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• First Micro – Apple II• First Mini – PDP 8• First Super – Cray 1
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Computer Organisation
• CPU• MEMORY • INPUT AND OUTPUT UNITS
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CPU
• Interprets and carries out instructions• Brain of computer• 3 components ALU + Control Unit + REGISTER1. ALU – Mathematical and Logical operations2. CU – fetch programs and control flow of
data3. REGISTER – high speed storage areas in CPU
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Memory Unit
• Store instructions and data• Internal and External memory
• Internal – RAM, ROM• External – secondary , teritiary
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RAM
• Random Access Memory• Short term memory• Volatile – only as long as computer has
power• Static RAM and Dynamic RAM
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ROM
• Read Only Memory• Called as Firmware• Non-Volatile• CACHE – memory used for fast processing• PROM, EPROM, EEPROM
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Memory Measurement
• 8 bit – 1 byte• 1024 byte – 1 kilobytes• 1024 kilobyte – 1 megabytes• 1024 megabytes – 1 gigabyte• 1024 gigabyte – 1 terabyte• 1024 terabyte – 1 petabyte
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External• Permanent storage of large data• Secondary : needs to be used again and again• example: harddisks, usb, flash drives, cds
dvds, memory cards, etc
• Teritiary : store information that is needed occasionally for review purpose or for restoring information after a system failure.
• Example : magnetic tapes, network server, optical disk
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Input Output devices
• Input – supply information • Keyboard• Mouse – pointing device only• Joystick – pointing device, in CAD and games• Light pen – pointing device, to draw picture on monitor
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• Track ball – used in laptop instead of mouse• Scanner – paper to harddisk• Digitizer – analog information into digital form• Magnetic Ink Character Reader MICR – Used in banks, bank code and
cheques with magnetic material inks• Optical Character Reader OCR – to read a printed text, scans text
optically character by character and converts into a machine readable code
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• Bar Code Reader – reading bar coded data converts into alpha numeric values• Optical Mark Reader – recognize the type of mark by pen/pencil checking answer sheets
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Output Devices
• Monitors and printers commonly• Speakers and headphones
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GPRS
• General Packet Radio Service is a wireless communication
• For sending emails, web browsing
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Bluetooth
• Short range wireless • Temporarily link between devices• Invented by telecom vendor Ericsson in 1994• Managed by Bluetooth special interest group ( SIG)
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languages
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languages
Low level
machine
High level
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Language and developers
• Basic – Thomas Kurtz• PASCAL – Nikalaus Wirth• C – Dennis Ritche• C++ - Bjarne Stroustrup• JAVA – James Gosling• COBOL – Grace Murray Hopper• FORTRAN – John Backus
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software
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software
System
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Translator software
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translator
compiler
Scans entire programs first, then translate to machine
interpreter
Translating high level to machine
assembler
Assembly into machine
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UPS
• Uninterrupted power supply• Power back up using a charging battery
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windows
• It’s a GUI • Owned by microsoft• Its easier than DOS
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UNIX
• Used in servers, workstations, mobile devices• Developed by AT & T Bells lab• By Ken Thompson, Dennis Ritchie • C language also by AT&T• UNIX – one of the first OS in high level
language, namely C.
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LINUX
• Open source, free software• Linux Torvalds• Mascot – Tux the Penguin• Released in 5th oct 1991• Latest version – Linux Kernal 3.19, feb 2015
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DOS
• First widely installed OS• IBM and Microsoft version• Non-graphical command oriented
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WiFi and LiFi
• Wireless Fidelity
• Light Fidelity – LED used here
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Microprocessor
• First – INTEL 4004• First in PCs – INTEL 8080• Largest manufacturer – INTEL
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Storage Capacity
• CD – 700 MB• DVD – 4.7 GB• Floppy Disk – 1.44 MB
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Number System
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Number System
binary
decimaloctal
Hexa Decimal
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Networking
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Network
LAN
local
MAN
metropolitan
WAN
wide
PAN
personal
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• Router – connector• ARPANET – first operational packet switching network by Massachusetts Institute of technologyWLAN – Wireless LAN
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Protocol
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protocol
TCP/IP
communication
FTP
Transfer computer files
SMTP
Email transfer
HTTP
Data over WWW
Telnet
Connect remote computer
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• TCP/IP – Transmission Control Protocol / Internet
protocol• FTP – File Transfer Protocol• SMTP – Simple Mail Transfer Protocol• HTTP – Hyper Text Transfer Protocol
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IP Address
• Numerical label assigned to each devices• IPv4 – 32 bit eg: 172.16.254.1
IPv6 – 128 bit, developed in 1995 eg: 2001:db8:0:1234:0:567:8:1
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Motto
• Don’t be Evil – Google• Applying Thought – Wipro• Your potential, Our Passion – Microsoft• Be What’s Next – Microsoft (new)• Power by Intellect, Driven by values - Infosys
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Internet
• Host – each internet computer • Internet Explorer – browsing software by MS• Intranet – restricted version in internet• Extranet – closed online connecting organization
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WWW
• World Wide Web• Web Portal – gateway website to internet• ISP – internet service provider• HTML – browser can read websites in this language, Hyper Text Markup Language• Home Page – first page of website• Surfing – visiting websites
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• Epic – first Indian web browser 2010 July 15 Hidden Reflex, Bangalore• URL – Uniform Resource Locator address that identifies a website
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Date and Day
• World Computer Literacy – Dec 2• National Internet Safety – Feb 16• International Internet Safety – Nov 30
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Illegal Practices
• Hacking – unauthorized use of computer• Spamming – sending unauthenticated emails• Phishing – email fraud method• Vishing – voice and phishing IP telephonic version of phishing• Email spoofing – forgery of an email head
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• Malware – software used to damage computer virus, worm, Trojan horse • VIRUS – Vital Information Resources Under Siege
• First virus – creeper in ARPANET• First personal computer virus – Elk Cloner• First virus infected Microsoft OS – Brain in 1986 by Farooq brothers• First mobile virus - Cabir
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• WORM – stand alone malware that replicate• TROJAN – Non self replicating malware
• Anti Virus – K7, McAfee, Kaspersky lab, AVG, Norton
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• First computer graphics used in film– TRON (1982)• First internet movie – Heart Beat• First film uses morphing – Willow• First computer magazine – “computer and automation”, by Edmund
Berkely• First real time computer – Whirlwind• First computer animated news reader – ANANOVA (Russia)
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fathers
• Computer – Charles Babbage• Computer Science – Alan Turing• Internet – Vinton Cerf• IT – Claud Shawn• Indian IT – Rajeev Gandhi• Super computer – Seymour Cray• Video games – Ralph Baer
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• Indian Super computer – Vijay Bhatkar• Free software - Richard Stallman• Linux – Linus Torwalds• Mobile phone – Martin cooper• Wikipedia – Jimmy wales• WWW – Tim Bernes Lee• Portable computer – Adam Osborne• ASCII code – Bob Bemer• Email – Ray Tomilson
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Inventors
• Google – Larry page and Sergey Brin• Facebook – Mark Zucker Berg• Yahoo – Jerri Yong, David Filo• Twitter – Jack Dorsey
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Devices
• Mouse – Douglas Engelbart• Keyboard – Christopher Sholes• CD – James T Russel• Floppy Disk – Alan Shugart
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Miscellaneous
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Internet Security
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CIA
Confidentiality
Data not accessed
by hackers
Integrity Availability
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Data security
Encrypt
Cipher text
Decrypt
Plain text
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Cyber Laws
• IT act 2000• Offence is investigated by a police officer not
below the rank of the Inspector
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offences
• Email bombing – large number of mails to victim
• Web Jacking – gains access and control over sites
• Pornography • Online gambling• Trafficking• Email spoofing• Forgery
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IT act
Section 43
Access, downloading, virus
Section 65
Tampering data
Section 66
Hacking
Section 67
Publishing obscene matters
Section 71
Penalty for misrepresentation
Section 72
Breach of privacy
Section 73
Penalty for false electronic signature certificate
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• Section 43 – fine up to 1cr• Section 66 – imprisonment 3 years or 5 lakh• Section 67 – 3 year and 10 lakh• Section 71 – 2 year or fine 1 lakh• Section 72 – 2 year or fine 1 lakh• Section 73 – 2-5 year or 1 lakh
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Some crimes under IPC
• Web Jacking – section 373 IPC• Cyber Fraud – section 420 IPC• Email Spoofing – section 465, 419 IPC• Sending defamatory message – section 499
IPC• Threatening message – section 506 IPC
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• Act administered by CERT• Appeal lies to Cyber Appellate Tribunal first in New Delhi in 2006• Now its called CRAT (cyber regulation A T)• Headed by a presiding officer – high court
judge• First officer – Justice R C JAIN
• First cyber police station - Bangalore
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