informative data

1. CRYPTOGRAPHY
 By
 MEHAK IQBAL

2. Cryptography
Cryptography
come from Greek
words KRYPTOS “
hidden” +graphing’
“to write “
Is the practice and
study of
techniques for
secure
communicate in
the presences of 3
parties called
adversaries

3. History of cryptography
There are 3
eras of
cryptography
1.Manual era
.
2.Mechhanic
al era.
3.Modern era.

4. Type of Cryptography

5. Type of cryptography cont:
1.Encryption:
the process of locking up information using
cryptography . Information that has been locked up this way is
said to be encrypted .
2.Decryption:
The process of unlocked crypt information using cryptography.
Key:
The secret like a password like encrypt or decrypt
information .
There are few keys used in cryptography .
1.Secure line
2.Public line:

6. Type of cryptography cont:
1.Secure line:
A transmission channel which can be used to
send
information secretly like no body. Be intercept
or read
that data.
2.Public line:
A transmission channel which cannot be used
to send information secretly the information
can be overheard easily .
A public pay phone is an excellent example of
this so is the internet .
Type of cryptography cont

7. Type of cryptography cont:
3.Symmetric cipher :
the simpler types of cryptography, the
same key is used to encrypt and decrypt
information. This key is sometimes called
a symmetric key line
4.Public key cryptography:
In this of cryptography one key is used to
encrypt and a matching key is used to
decrypt

8.  These 2 key to gather are called a key
pair .
One of these keys is called the secret key
or
private key and should be kept secure.
The other is called the public key .

9. The end
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