By definition, non-repudiation is the security concept that uses the ability to prove that a sender undeniably sent an encrypted message.
A message sender needs to be sure that the content of the message hasn't been altered before it reaches the recipient by using an encrypted message.
By the principle of non-repudiation, No party can refute that it sent or received communication using encryption or digital signatures or that it accepted some material. It cannot also contest the validity of a signature on a document.
In an encrypted message, encrypting the content can increase the security of a message or file. If you had the right key to decode a message and the right key to encrypt it, it would be helpful.
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