**4. Result of injection**

The standard TCP header field with options and fall is 192 bits. As a result of the above actions, you can use up to 150 bits, which is 78.13% of the total number of bits in the original, unmodified header. This amount of data allows the use of 18 characters in an 8-bit header in the standard ASCII character set. Therefore, after all the calculations, we get the maximum possible amount equal to 6 bits. The processed piece of information was included in the next 8 bits of the transmitted symbol.

**83**

**Figure 4.** *Header of UDP.*

*Analysis of Network Protocols: The Ability of Concealing the Information*

Header's format of UDP is presented in **Figure 4**.

User Datagram Protocol is a connectionless transport layer protocol. No connection setup is created before transferring between hosts. This protocol is less reliable than TCP, but gives a higher transfer rate with less overhead. This protocol

1.You can change the "Source Port" field value. Processing is only possible when the package was a hidden data source. Because of the manipulation that had occurred at the source device, the receiving party cannot properly assemble the original packets. This manipulation cannot be detected by the packet

You can change the "Target Port" field value. Processing is only possible when the package was created by a hidden data source. Due to the manipulation of the device generating the packages, the receiving party cannot correctly assemble the source packages. This modification cannot be detected by the

We could change the significance of the "Length" field. Increasing the value of this field has also increased the size of the package, so we can change the fields

So processing is possible when the package was a source of hidden data. So if the modification had occurred at the source device, the receiving host cannot properly assemble the original packets. This manipulation cannot be detected by the packet

of data octets by appending to the end of datagram.

*DOI: http://dx.doi.org/10.5772/intechopen.88098*

is standardized by RFC 768.

*4.1.1 Header field of UDP*

"Source Port" field

2. "Destination Port" field

network sniffer.

3. "Length" field

sniffer.

sniffer.

**4.1 UDP**

*Analysis of Network Protocols: The Ability of Concealing the Information DOI: http://dx.doi.org/10.5772/intechopen.88098*
