Hatti matim tim, Ami mathe pari Dim

2011-12-08T11:12:00.001-05:00

I want to know if you can see Beauty
even when it is not pretty
every day.
And if you can source your own life
from its presence.

I want to know
if you can live with failure
yours and mine
and still stand at the edge of the lake
and shout to the silver of the full moon,
“Yes.”

- from The Invitation
by Oriah Mountain Dreamer

2011-08-07T23:04:00.001-04:00

I watch the stars from my window sill
The whole world is moving, and I'm standing still

How far I am from home

2011-07-24T02:10:00.002-04:00

How far I am from home, originally uploaded by sheetal_shundori.

Feeling homesick

2011-05-05T23:07:00.001-04:00

"Would you tell me, please, which way I ought to go from here?"
"That depends a good deal on where you want to get to," said the Cat.
"I don’t much care where--" said Alice.
"Then it doesn’t matter which way you go," said the Cat.
"--so long as I get SOMEWHERE," Alice added as an explanation.
"Oh, you’re sure to do that," said the Cat, "if you only walk long enough."

I couldn't open file name `*.aux'

2011-05-04T17:18:00.000-04:00

If you have more than one bib file, add them like this:
\bibliography{bibliography_1,bibliography_2,bibliography_3}

Open up the .tex file and compile it using Latex (Shift+Apple+L) then compile it using Bibtex (Shift+Apple+B)

Gender Guesser

2011-05-02T21:29:00.002-04:00

Gender Guesser Script: http://www.hackerfactor.com/GenderGuesser.php
This script can guess gender from writing sample.
It's not 100% accurate but it predicted me as a female!!
It's so weird that how much information we reveal about ourselves without even thinking about it.

Project Implicit

2011-04-28T18:27:00.007-04:00

Project Implicit (https://implicit.harvard.edu/implicit/) is about our conscious and unconscious preferences and biases. For example, most people connote blondes with "dumbness", and tall and handsome with "intelligence"; we don't do it consciously, or we don't want other people to know about our true biases. But even when we try to hide our preferences, we end up revealing them through our attitudes or actions.

The Implicit project tries to measure these unconscious biases. In the test you have to categorize words into different groups, generally two. For example, the gender-science test will ask you to categorize different words into two groups: male/science and female/arts. Then it will ask to categorize words into other two groups: female/science and male/arts. If you are biased about man and science, then you'll take more time to classify science words as female/science than to classify them as male/science. The test will measure your response time and figure out your true preference.

I read about this project in "Blink." Then I took several tests and got very weird results. Like, I don't have any preference for female and science over male and science. But my test suggested that I do. I took another test about preferring self over others, whose result was contradictory as well. I feeling a little confused about myself now.

But it was fun!

2011-04-28T17:18:00.004-04:00

Why are Bangladeshis so emotional?
Most of our songs are about losing somebody, mostly some girl, as men write those songs in most cases. Most of my Bangladeshi friends' facebook statuses are about past memories and having "nostalgia". Everyone is missing "something" at EVERY moment. And as soon as THIS moment will pass, they will start missing it and loving it.

Sometimes I feel that they don't really miss those things, but they just say that they do, just to conform with our national sugary characteristic.

It's so strange that every nation has a unique character. It's like being a part of Captain Planet- we all have our unique powers but when we combine as a nation, we behave as one person.

2011-03-23T19:54:00.000-04:00

Those that I fight I do not hate,
Those that I guard I do not love.

Full poem

Crypto codes: GGH public key cryptosystem

2011-03-12T03:37:00.001-05:00

Download code from here
I only did the decryption part, using Babai's algorithm (for homework :D)

Crypto codes: Elliptic ElGamal

2011-03-11T04:43:00.000-05:00

Download code from here

Crypto codes:Miller Rabin Primality test

2011-03-11T03:47:00.001-05:00

Download code from here

Output: (exercise 3.14 in the Introduction of Mathematical Cryptography)

1105 is composite with witness 2
294409 is composite with witness 2
118901509 is prime
118901521 is composite with witness 2
118901527 is prime
118915387 is composite with witness 2

Crypto codes: Elliptic curve cryptography

2011-03-11T03:44:00.001-05:00

Download code from here
Code includes:
Elliptic curve addition,
Point in Elliptic curve over finite fields
double-and-add algorithm for Elliptic curves

Output:

Points in E(F13) are :
(-Infinity,-Infinity)
(1.0,5.0)
(1.0,8.0)
(2.0,3.0)
(2.0,10.0)
(9.0,6.0)
(9.0,7.0)
(12.0,2.0)
(12.0,11.0)
Addition test->
(9.0,7.0) + (1.0,8.0) =(2.0,10.0)
double-and-add algorithm for elliptic curve->
947*(6.0,730.0) mod 3623= (3492.0,60.0)

Crypto codes: Pollard’s p − 1 factorization algorithm

2011-02-25T20:57:00.003-05:00

Code here
It uses prime factor code from square root

Output shows the steps of the algorithm with results:

Find prime factors of 48356747:
2^19! -1 = 13944673 (mod 48356747)
gcd(2^19!-1,48356747) = 6917
factors of 48356747, p=6917, and q=48356747/6917=6991
The prime factorization of 6916 is: 2, 2, 7, 13, 19

The prime factorization of 6990 is: 2, 3, 5, 233

Day `haven't-count-for-a-while:' Congratulations! You Won!

2011-02-24T15:16:00.003-05:00

All the emails congratulate me, turn out to be spam.
I love you spammers, you keep me going.

Crypto codes: Square roots modulo composite moduli

2011-02-13T20:18:00.003-05:00

Chinese remainder code: Here
Fast squaring code: Crypto codes 1

Square roots modulo composite moduli: Download from here

Crypto codes (3)

2011-02-07T02:43:00.004-05:00

Download from here
For the inverse and fast squaring code, see Crypto codes: 1

Finds eth root modulo p:

public class RSA {

 //find x from x^e = c (mod p)
  public static long findRoot(long e, long c, long p)
  {
   long x = 0;
   
   //find e^-1 (mod p-1)
   long eInverse = crypto.inverse(p-1, e);
   
   //x = c^d (mod p)
   x = crypto.fastSq(p, c, eInverse);
   
   return x;
  }
       //test: answer = 6059
  public static void main(String[] args) {
   
      long e = 1583;
      long c = 4714;
      long p = 7919;
      
   long x = RSA.findRoot(e,c, p);
   System.out.println("Solution to x^"+e+" = "+c+" (mod "+p+"): x= "+x);
  }

}

This test will return:

Solution to x^1583 = 4714 (mod 7919): x= 6059

Matlab codes: http://www-users.math.umd.edu/~lcw/MatlabCode/

Crypto codes: Chinese remainder theorem

2011-02-02T21:59:00.007-05:00

For gcd and inverse code, see Crypto codes

Java implementation of Chinese remainder theorem, download from here
Matlab code here

For this particular example, output will look like the following:

Step:0->x=2+3*5=17
Step:1->x=17+21*7=164
Solution:164

Crypto codes: ElGamal public key cryptosystem

2011-01-23T22:15:00.017-05:00

Algorithms from An Introduction to Mathematical Cryptography book.
Here, Bob sends an encrypted message to Alice using ElGamal public key cryptosystem.
Download code from here

Extended Euclidean algorithm
Matlab code for modular inverse:

[u,y,d] = gcd(x,p); 
y = mod(y,p);

Man has no choice When he wants everything

2011-01-23T06:40:00.000-05:00

Listen

ImportError: No module named setuptools

2011-01-21T06:55:00.002-05:00

http://www.errorhelp.com/search/details/74034/importerror-no-module-named-setuptools

Technical Writing

2011-01-19T03:06:00.001-05:00

Teach Technical Writing in Two Hours per Week
Politics and the English Language

The Human Incubator

2011-01-04T16:24:00.002-05:00

The Human Incubator

http://opinionator.blogs.nytimes.com/2010/12/13/the-human-incubator/..

The success of "kangaroo care" for premature infants has shown that simple solutions are sometimes best.

The bubbles are not reality but it's inside your mind

2010-12-30T19:24:00.003-05:00

The bubbles are not reality but it's inside your mind, originally uploaded by sheetal_shundori.
We live in a bubble baby.
A bubble's not reality.
You gotta have a look outside.
Listen

Social network and Privacy

2010-12-26T00:45:00.001-05:00

Presentation: The real life social network
How much information a Fake profile can gather: Getting in bed with Robin Sage