Cryptography Questions And Answers

1⟩ What is cryptography?

The science and art of manipulating messages in order to

make them secure is called cryptography......

types are

symmetric key cryptography and asymmetric key cryptography

1)symmetric key cryptography

same key is used for encryption and decryption

eg :DES IDEA AES

2)Asymmetric key:

public key is used for both encryption and decryption

eg:RSA Difere Hellman

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2⟩ (1/10)18 - (1/10)20 = ?

If it's the Same Question:

Step 1. (0.1)/18-()/20

Step 2. (0.1)((1/18)-(1/20))

Step 3. 0.1 (10-9)/180 -----------> LCM of 18 & 20 = 180

Step 4. 0.1/180

Step 5. 1/1800 is the Answer

Approx = 0.000557

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3⟩ Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the timetaken to fill the tank?

a fill - 1/20 per minute

b fill - 1/30 per minute

c can empty - 1/40 per minute

Suppose this take x minute

1 x +1x - 1x

--- -- ---- =1

20 30 40

Solve this x=17(approximately)

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4⟩ How to Find the XP Lost Password?

Forgot XP Password

The other day I got a call from a friend who had managed to

remember his administrator password to his Windows XP

computer.

My heart sank as I told him it is almost impossible to

access hi PC now as this was the only account on the

machine, and with no password Windows XP was not going to

let him in!

Forgotten XP Password...

As I stared at my mates computer and asked if he had ever

made a Password Reset Disc I already knew what he was going

to say...

This situation reminded me of asking many friends for their

latest data backup CD/DVD when their computer crashed and

need a rebuild - they NEVER have one!!!

...well a quick check on Google and I found a great service

that could just help my mate out.

This site provides a tool to recover lost Windows XP

passwords - YEAH!

It works very prefect to regain your password .Also use to

bootable CD/DVD or usb

There is a free service as well as a priority service that

will retrieve your passwords within minutes. The fee for

the priority service is very cheap, and is really just to

cover server costs.

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5⟩ What is quantum computing?

In quantum computing, we use the concept of qubits,

superposition and coherence. A normal bit can be in only

two states - 0 and 1. But a qubit it can be in 0, 1, or in

the superposition of 0 and 1.

Quantum computers, will be much much faster than

traditional silicon based compuers.

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6⟩ What is Clipper?

Clipper is a compiler that was well known at the time of

80's and early times of 90's. We can build DOS based

applications (even large applications too) using clipper.

There is no seperate Database required to use

with clipper. It itself is having capacity to maintain data

in the form of tables and we can use it to write coding also.

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7⟩ What is quantum cryptography?

The science of cryptography has existed in one form or

another for centuries.

Cryptography is the art of encoding and decoding messages

for transmission between two

parties, while keeping the message secret from unwanted

viewers. There are many common

implementations of cryptography in use today such as the

HTTPS protocol on the Internet. All

forms of data encryption and cryptography require a key in

some form or another for use in

encoding and decoding data. There are even some modern

methods of encryption that have been

mathematically proven to be unbreakable if they are

implemented properly.

The inherent problem with any form of cryptography is in

the method of key distribution.

To date, all forms of message encryption have possessed

this major vulnerability. As such, it

makes no difference whether a secret message is sent via

homing pigeon, a radio transmission, a

penciled message on a notepad, or whispering to another,

there is no physical way to get a

cryptographic key to another without running the risk of

the key being intercepted.

To solve this dilemma, a radical solution has been proposed

called quantum

cryptography. This method essentially uses photon light

particles to send a key to an intended

recipient. The difference with this method of key

distribution is that it implements quantum

mechanic’s uncertainty principle as a means to guarantee

the privacy of a key during

distribution. Practically, quantum cryptography has the

ability to afford complete privacy during

the entire broadcast of an encoded message.

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8⟩ What are biometric techniques?

those are technics like

face detection

Iris recognition

fingerprint recognition

palm vien recognition.

All these can be used for Authentication

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9⟩ What is tamper-resistant hardware?

Ensuring that various cryptographic keys are provided by

their intended users, and only for their intended purposes,

temper resistent hardware is introduced.

An example temper resistent device is your "SMART CARD".

You have to physically posess the device and also have to

possess the PIN or the password to use it.

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10⟩ Can we do the project in ENCRYPTION AND DECRYPTION as a operating system project? If yes how can we use the concepts?

Yes we can. All the information will be stored in encrypted

form in memory. During fetching, it must be first decrypted

by operating system and then can be read.

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11⟩ What is Capstone?

It is known as "Corner Stone" It is the Jesus Christ.

He is “ the stone you builders rejected, which has become

the capstone.” Acts 4:11 (NIV)

History also refers this! B.C. & A.D. are cutting around

HIM, showing HIM as the Capstone. There are plenty to tell....no End.

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Cryptography

Home Cryptography Cryptography

11 Cryptography Questions And Answers

1⟩ What is cryptography?

2⟩ (1/10)18 - (1/10)20 = ?

3⟩ Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the timetaken to fill the tank?

4⟩ How to Find the XP Lost Password?

5⟩ What is quantum computing?

6⟩ What is Clipper?

7⟩ What is quantum cryptography?

8⟩ What are biometric techniques?

9⟩ What is tamper-resistant hardware?

10⟩ Can we do the project in ENCRYPTION AND DECRYPTION as a operating system project? If yes how can we use the concepts?

11⟩ What is Capstone?

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Cryptography

Home Cryptography Cryptography

11 Cryptography Questions And Answers

1⟩ What is cryptography?

2⟩ (1/10)18 - (1/10)20 = ?

3⟩ Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the timetaken to fill the tank?

4⟩ How to Find the XP Lost Password?

5⟩ What is quantum computing?

6⟩ What is Clipper?

7⟩ What is quantum cryptography?

8⟩ What are biometric techniques?

9⟩ What is tamper-resistant hardware?

10⟩ Can we do the project in ENCRYPTION AND DECRYPTION as a operating system project? If yes how can we use the concepts?

11⟩ What is Capstone?

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