Integrity in network security

When content of message change after sending the message by sender but before receiver receive it then we can say that integrity of message is lost.
For example if user A sent message to user B but somehow user C managed to access that message and change content of message. User B have no way to knowing that message is tampered after user A sent that message. User A also does not know that message is tampered.
This type of attacks is known as modification.

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