Difference between encapsulation and decapsulation

In data communication there are two concept involves in transmission namely encapsulation and decapsulation. Encapsulation adds addition information to a send packet as it travels to its destination,and Decapsulation is the reverse process of encapsulation, So a receiver node can read the original send data/information. This article will make you aware of Encapsulation & Decapsulation, and their differences.

What is Encapsulation?

Encapsulation refers to attaching new information in the Application Layer data as it is passed onto the next layers in the TCP/IP model. This additional information basically divided into two parts, Header and Trailer. These are elements attached in order to make the transmission more smoother, on each layer a PDU (Protocol Data Unit) is generated.

What is Decapsulation?

Decapsulation refers to the removal of all these additional information and extraction of originally existing data, and this process continues till the last layer i.e. the Application Layer. This process removes, fragments of distinct information in each layer as it approaches that layer. Here is the pictorial representation of the whole process. 

Difference between Encapsulation and Decapsulation

What is Encapsulation and Decapsulation in Cryptography?

Encapsulation and decapsulation processes in cryptography, in most contexts, relate to public key encryption schemes, specifically in protocols like Key Encapsulation Mechanism, usually shortened as KEM.

• Encapsulation: This is a process for generating and encrypting symmetric keys using the recipient's public key: a sender would think of a random symmetric key-the session key-and then encapsulate the session key with the recipient's public key. It is transmitted to the recipient in a secure way.
• Decapsulation: It is the reverse process of encapsulation. It involves an encrypted form symmetric key, and the recipient decrypts the encapsulated key using his private key. This decapsulation process ensures that the symmetric key would only be delivered to the appropriate recipient as only they could have the correct private key in this regard.

These are very necessary processes in scenarios when asymmetric encryption creates secure channels of communication, but symmetric keys are often used to encrypt data because of efficiency.

Why is Encapsulation and Decapsulation Important?

Encapsulation and decapsulation are important on the basis of:

• Efficiency: Symmetric encryption algorithms are usually faster compared to asymmetric algorithms. In this way, just the symmetric key is transmitted in a secure way using asymmetric encryption by encapsulation and decapsulation, to then do the real encryption of data in an efficient way using symmetric algorithms.
• Security: Because they make sure that only the intended receiver has access to the symmetric key and then, subsequently, the encrypted data. The use of asymmetric encryption in encapsulation does not allow unauthorized access to the data.
• Simplification of Key Management: Usually, symmetric session keys are established at the start of each session by encapsulation in secure communication protocols. If so desired, each session can be based on a different symmetric key, thereby offering forward secrecy.
• Flexibility: Encapsulation and decapsulation enable secure key exchange over insecure channels. This flexibility is crucial in most secure communication protocols, including TLS, for establishing secure connections.
• Encapsulation-decasulation: When taken together, enhances security and effectiveness in cryptographic systems by pulling the best from symmetric and asymmetric encryption.

Conclusion

Encapsulation and de-capsulation are actually both inseparable ways of helping the piece of data to flow safely and reach its designated destination correctly over the networks. Encapsulation is the fact of wrapping data with protocol-specific headers for data movement across different networks, and de-capsulation is the fact of header removal to reach the original data. So, it is actually important to know the difference between these processes in implementing secure and efficient communication for many networking and cryptographic applications.