Security attack based projects are developed under cryptographic techniques. Some of the attacks to be detected using cryptographic functions and algorithms are followed. Security attacks are interruption, fabrication, interception, modification, active attacks and passive attacks. Passive attacks are traffic analysis and release of message content. Active attacks are replay, Denial-of-service, masquerade and modification of message. Algorithms used for cryptographic techniques based applications. The algorithms are having some structure also. The Advanced Encryption Standard (AES) algorithm should have the structure of substitution-permutation network. The DES algorithm has works under the structure of Balanced Feistel Network.  RC2 algorithm had the structure of Source-heavy Feistel Network. Skipjack has the structure of Unbalanced Feistel Network.

Advantages of cryptography based Projects

• Any one of the algorithm can works simple in nature.
• Provide more security.
• Easy to perform CRC checking.
• Small amount of data processing steps are in easy way

Cryptography based projects are additionally required the processes of compression. Using compression process we have to give more security to the data which can be transferred in the network. Sometimes the cryptography method can be combined to the process of steganography. The alphabets spitted in the cryptography technique are covered by some images. Those type of combined security process also done using matlab.