August 18, 2018

Playfair Cipher in C (Encryption & Decryption)

Playfair Cipher in C (Encryption & Decryption)

Playfair Cipher

The Playfair cipher or Playfair square or Wheatstone-Playfair cipher is a manual symmetric encryption technique. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use.

The Playfair cipher uses a 5 by 5 table containing a key word or phrase. Memorization of the keyword and 4 simple rules was all that was required to create the 5 by 5 table and use the cipher.

C Program:

August 18, 2018 4
Caesar Cipher in C (Encryption & Decryption)

Caesar Cipher in C (Encryption & Decryption)

Caesar Cipher Image

 Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plain text is replaced by a letter some fixed number of positions down the alphabet.

C Program:



August 18, 2018 0

July 21, 2018

CodeVita Practice Round 2 | TCS Mockvita 2 2018 Questions

CodeVita Practice Round 2 | TCS Mockvita 2 2018 Questions


TCS(Tata Consultancy Services), one of the biggest Indian IT companies, arranges CodeVita online exam. To get prepared for Codevita, TCS also arranges Mockvita before the codevita. 

This year (2018), MockVita 1 was arranged on 6,7 July 2018.
and CodeVita Practice Round(MockVita 2) was arranged on 20,21 July 2018.
Time period was 6 hours.

Here I have posted questions asked in Practice Round of CodeVita. (no answers) :

July 21, 2018 0

July 08, 2018

CodeVita Practice Round 1 | TCS Mockvita 2018 Questions

CodeVita Practice Round 1 | TCS Mockvita 2018 Questions


TCS(Tata Consultancy Services), one of the biggest Indian IT companies, arranges CodeVita online exam. To get prepared for Codevita, TCS also arranges Mockvita before the codevita. 

This year (2018), MockVita was arranged on 6,7 July 2018. 
Other Practice Round was arranged on 20,21 July 2018.
Time period was 6 hours.

Here I have posted questions asked in Mockvita. (no answers) :


Also check : Use iOS,Twitter,Samsung emojis instead of default Android emojis
July 08, 2018 0

February 16, 2018

Some Useful & Awesome Computer Notes | LinksContainer

Some Useful & Awesome Computer Notes | LinksContainer

Chrome:

The list of hidden Chrome URLs can be opened by typing chrome://about or chrome://chrome-urls/ in the address bar. 
chrome hidden url screenshot
Screenshot of Chrome all settings URLs

Hardware:

In Computer cabinet,
Red light is a Hard drive seeking/writing operation indicator.
Green light is of running ON process of computer.

To clear recent items from jump list:

Open Run (win enter image description here + r),
Type  %AppData%\Microsoft\Windows\Recent\AutomaticDestinations
Delete files.

Add Startup file in Windows :

If you want to start a software or some notepad files as you ON the pc. then do as follows:
Open Run (win enter image description here + r),
Type  shell:startup
In this folder, add whatever files or shortcut of apps you want to start. 

Full shutdown PC:

Sometimes full shutdown of windows OS is required because if you want to open the drive in OS like linux then it cannot mount(open) it. Click Here for more.
Open cmd/PowerShell as Administrator (win enter image description here + x),
Type shutdown /s /f /t 0 

Want to back old Windows Photo Viewer in Windows 10 ?:

There is a tweak and with that you can bring back your old Windows Photo Viewer software in windows 10 that is replaced by Photos app.
Copy below code and paste in notepad. Then save it as PhotoViewer.reg.(AnyName.reg) Open by Double Clicking. Click Yes.
And So the software appears in "open with" in context menu of image format. (can also set as default)

WEI Performance Scan in Windows 10:

In early Windows editions like 7,8, there are index of performance already available in System Properties. (ex. 4.5. 3 rating)
But in Windows 10, it disappears. It can be seen in Ganes folder.(Run> shell:games) only when you have done the scan of performance.
Open cmd as administrator
Type winsat formal -v -xml c\winstats.xml
Done.
Now open shell:games in Run and you will see the results.

Can't Comment to a Blog:

Enable "third-party cookies" from Settings of Browser.

Remove Copy Protection from PDFs:

Open pdf, then click on Print and Select "Save as PDF" and Print. (Works only if the pdf is not print protected)

February 16, 2018 0

August 14, 2017

TCS Codevita 2017 Questions (Round 1 & 2) | LinksContainer

TCS Codevita 2017 Questions (Round 1 & 2) | LinksContainer

tcs codevita 2017 questions round 1 & 2
TCS(Tata Consultancy Services), one of the biggest Indian IT companies, arranges CodeVita online exam. The CodeVita journey began in 2012 with the aim of promoting Programming-As-A-Sport, and has touched many milestones since then. In 2014 was the first time they opened the contest globally and many students were participated.

 Previously CodeVita was not individual but this time they have arranged it for an individual.

Here I have posted CodeVita 2017 Questions of Round 1 and Round 2.

download tcs codevita 2017 questions round 1 download tcs codevita 2017 questions round 2

MockVita 1 2018 Questions MockVita 2 2018 Questions


Each one is zip file containing all questions. (Google Drive Link).

 There are 3 main rounds to the contest.*
Round 1: there are will be various regional/zonal rounds. This will be conducted in 3 phases between Jul – Aug 2017, across India. They will map the student to the region/zone based on the location of their college. Details of zonal mapping and the exact time-lines are communicated subsequently.
Round 2: Top performers from the zonal rounds are move to round 2. Top performers from round 2 have the opportunity to move to the Grand Finale, The list of Finalists is compiled only after all regional rounds across the globe are completed
Grand Finale: To be held in one of the TCSL offices in India. Top 3 contestant are declared as winners of the contest. Winners (Top 3 contestants) receive a total cash prize of USD 20,000. They are extending internships and offers to top coders from the contest.
If above link doesn't work then find codevita post here. 
*Rounds information are based on this season. It may change for next seasons.
August 14, 2017 0