Cyber Security / Cryptography in Cyber security
Cryptography
It is a process of converting plain text into cipher / unintelligible text and vice-versa. It protects data from theft or alteration and also used for user authentication.
Encryption
1. It a process of converting plain text into cipher / unintelligible text using Key.
2. All data in SSL transactions is encrypted between the client (browser) and the server (web server) before the data is transferred between the two.
Decryption:
Reverse of encryption is called as Decryption
Cryptography Properties
|
Cryptography Property Name |
Details |
|
Confidentiality |
Information cannot be understood by anyone while in transmission. |
|
Integrity |
Information cannot be Modified. |
|
Non-repudiation |
Sender cannot deny his/her intentions in the transmission of the information at
a later stage |
|
Authentication |
Sender and receiver can confirm each other |
Types of cryptographic techniques
|
Cryptograpy Type |
Details |
|
Symmetric-key Cryptography |
Both the sender and receiver share a single key. |
|
Public-key cryptography |
Here two related keys (public and private key) are used. Public key is freely
distributed used for encryption and private /secret key used for decryption. |
|
Hash functions. |
No keys are used in this algorithm but it uses Hash functions to calculate a
hash value based on plain text and its length and is used to recover plain text. |
Cryptography applications:
Banking transactions, computer passwords, Ecommerce transactions e.t.c.
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