tell me about CRYPTOGRAPHY AND STEAGNOGRAPHY?

Question

animation link recommendations have better chance of getting 10 points

Answer 1

CRYPTOGRAPHY Its a study of encoding - the study or analysis of codes and coding methods. Also called cryptology. Its a secret writing used for transfer of data or information.

Answer 2

N.B: I just like to answer Security related questions so i am answering. Because i think that this will be beneficial for others. My request, please do not give that 10 pts to me. Please.

Definition: The art and science of keeping messages secure is cryptography, and it is practiced by cryptographers.

A message is plaintext (sometimes called cleartext). The process of disguising a message in such a way as to hide its substance is encryption. An encrypted message is ciphertext. The process of turning ciphertext back into plaintext is decryption.

Historically, a code refers to a cryptosystem that deals with linguistic units: words, phrases, sentences, and so forth. For example, the word “OCELOT” might be the ciphertext for the entire phrase “TURN LEFT 90 DEGREES,” the word “LOLLIPOP” might be the ciphertext for “TURN RIGHT 90 DEGREES,” and the words “BENT EAR” might be the ciphertext for “HOWITZER

Steganography serves to hide secret messages in other messages, such that the secret’s very existence is concealed. Generally the sender writes an innocuous message and then conceals a secret message on the same piece of paper. Historical tricks include invisible inks, tiny pin punctures on selected characters, minute differences between handwritten characters, pencil marks on typewritten characters, grilles which cover most of the message except for a few characters, and so on

More recently, people are hiding secret messages in graphic images. Replace the least significant bit of each byte of the image with the bits of the message. The graphical image won’t change appreciably—most graphics standards specify more gradations of color than the human eye can notice—and the message can be stripped out at the receiving end. You can store a 64-kilobyte message in a 1024 × 1024 grey-scale picture this way. Several public-domain programs do this sort of thing.

Simple example of encryption:

XOR is exclusive-or operation: ‘^’ in C or ⊕ in mathematical notation. It’s a standard operation on bits:

0 ⊕ 0 = 0
0 ⊕ 1 = 1
1 ⊕ 0 = 1
1 ⊕ 1 = 0
Also note that:

a ⊕ a = 0
a ⊕ b ⊕ b = a

There are many cryptographic algorithms. These are three of the most common:

— DES (Data Encryption Standard) is the most popular computer encryption algorithm. DES is a U.S. and international standard. It is a symmetric algorithm; the same key is used for encryption and decryption.
— RSA (named for its creators—Rivest, Shamir, and Adleman) is the most popular public-key algorithm. It can be used for both encryption and digital signatures.
— DSA (Digital Signature Algorithm, used as part of the Digital Signature Standard) is another public-key algorithm. It cannot be used for encryption, but only for digital signatures.

Answer 3

Cryptography is something related to the, sending/storing message or information in a format which can be understandable only after going through certain procedure.

Stengnography is something related fast writting. Here person writes short notation of every word/chatacter to complete the script soon. later he/she expands it on to a paper.

diffrence is, steagnographer writen script can be understand by other but once any one encrypts any text only the persons who know decryption can understand it, since they can only decrypt it.
(bracking encryption is diffrent)

Answer 4

cryptography-theory of encoding information with secret keys and then transmitting the encoded information.A third party not authorized of getting that message would not be able to decode the message without the knowledge of secret keys

steganography-thery of concealing information within images and then transferring them to the other party.Even if an intruder gets hold of the image,it would luk like a normal image to him and he would not know about the information present