00:01
So, in this question, let's verify that the, verify that document p is genuine, genuine and has not been tampered with.
00:27
The receiver r, the receiver r needs to compute the following values.
00:43
So there are steps.
00:45
So step 1, h of p, this computes the hash of the original document, document.
01:03
So, document of p, so the receiver can independently calculate the hash of the received document and compare with the value of h of p received from the sender, received from the sender.
01:29
So now, it indicates that the document has not been altered during transmission.
01:38
It indicates document has not been, not been altered.
01:54
Okay, next second one is, d, sig, k, s, r.
02:11
The receiver r needs to decrypt the digital signature.
02:16
Receiver r needs to decrypt the digital signature using the sender's public key, that is k, s, r.
02:51
This step ensures that the signature was indeed generated by the sender, sender s using their private key.
03:09
So now, let's see the third point, h of sig.
03:16
So after decrypting the digital signature, after decryption of digital signature, the receiver computes the hash of the decrypted signature, that is h of sig, k, s, r.
03:52
The receiver can compare this hash with the hash of the original document p, original document p, he can compare.
04:09
So, that is h of p.
04:15
If they match, it confirms that the digital signature corresponds to the document p.
04:21
Okay, so if it only matches only then we can say that it corresponds to the document p.
04:28
So, it's important to note that the following options are incorrect.
04:33
So these are the options for incorrect...