Cryptography Overview, Types and Working.
                     CRYPTOGRAPH
Y: OVERVIEW, 
TYPES AND 
WORKING
Introductio
n
Cryptography is technique 
of securing information and 
communications through 
use of codes so that only 
those person for whom the 
information is intended can 
understand it and process 
it.
Source: www.geeksforgeeks.org
TYPES OF 
CRYPTOGRAPHY
Symmetric 
Key 
Cryptograp
hy
It is an encryption system 
where the sender and 
receiver of message use a 
single common key to 
encrypt and decrypt 
messages. 
Symmetric Key Systems are 
faster and simpler, but the 
problem is that sender and 
receiver must somehow 
exchange key in a secure 
manner.
Source: www.geeksforgeeks.org
Hash 
Functions
There is no usage of any 
key in this algorithm. A 
hash value with fixed 
length is calculated as per 
the plain text which makes 
it impossible for contents of 
plain text to be recovered.
Source: www.geeksforgeeks.org
Asymmetri
c Key 
Cryptograp
hy
Under this system a pair of 
keys is used to encrypt and 
decrypt information. 
A public key is used for 
encryption and a private 
key is used for decryption.
Source: www.geeksforgeeks.org
FEATURES OF 
CRYPTOGRAPHY
Confidentia
lity
Information can only be 
accessed by the person for 
whom it is intended and no 
other person except him 
can access it.
Source: www.geeksforgeeks.org
Integrity
Information cannot be 
modified in storage or 
transition between sender 
and intended receiver 
without any addition to 
information being detected.
Source: www.geeksforgeeks.org
Non-
repudiation
The creator/sender of 
information cannot deny 
his or her intention to send 
information at later stage.
Source: www.geeksforgeeks.org
Authenticat
ion
The identities of sender and 
receiver are confirmed. As 
well as destination/origin of 
information is confirmed.
Source: www.geeksforgeeks.org