Data Encapsulation (Encrypted Data) + Secret Key = PlainText (Original Data) The Main Problem with the Technique is the usage of Same Key for both encryption and decryption So, if the sender sends the data to the receiver, the third party is likely to be able to eavesdrop and forge and sniff the conversation, data etc between sender and receiver which could create a massive problem to both of them In order to overcome the problem, WhatsApp basically uses Two Keys for both encryption and decryption. Plain text using the same Secret Key for it i.e. PlainText + Secret Key = Data Encapsulation (Encrypted Data) Once the data has been received by the receiver needs to be decrypted i.e. So Firstly, the Plain Text is encrypted using Private Key for the Data Encapsulation i.e. Nowadays, WhatsApp has become the best interoperable Instant Messaging and VoIP (Voice over Internet Protocol) and Multimedia platform for the end users that provides them an well-serviced environment for Instant Messaging, Voice/Video Calling, File Transfer such as Documents, Videos and Images easily at the scale with high-end encryption encapsulated into it globally.
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