1.

Why Do We Need It?

Answer»

We need cryptography to share information confidentially which is ENSURING the secrecy of communication:

  • Authentication – Ajitab can SIGN his message and Mulu can VERIFY that he sent it based on his signature
  • Integrity checking -Mulu can generate a checksum of the message. Ajitab can either extract it from the message or recalculate it and verify that the message has not been changed.
  • Non-repudiation – if Ajitab signs the message he cannot deny later that he sent it, because no one else COULD generate that same signature/private key.

We need cryptography to share information confidentially which is ensuring the secrecy of communication:


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