Here in this blog I am explaining about Symmetric key Encryption.
Symmetric Key algorithms are a class of algorithm for Cryptography that use trivially related,often identical cryptograhpy keys for encryption and decryption both.encryption algorithm that use the same key for Encrypting and Decryting information are called symmetric key algorithm.in symmetric key Encrption,each computer has a secret key that it can use to encrypt a packet of information before it is sent over the network to another computer.
The Major vulnarability of symmetric key algorithm is the need for sharing the symmetric key.
Strength of the symmetric key encryption depends on the size of the key used.for the same algorithm,encrypting using longer key is tougher to break than the one done using smaller key.
Symmetric key systems are simpler and faster,but the main drawback is that the two parties must somehow exchange the key in a secure way.