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Digital sign asc

yuccas favorite testing concept is digital signature and so is our topic today we need to remember two steps to understand how digital signature is created step 1 - create hash of the message and step 2 now and grip this particular has that we are out in step 1 how this is done we will understand in our next slide let us understand about the step 1 that is how to create a hash file for example our message is meeting at 8 a.m. so for this has value comes 245d abcdefg something like this now this value is unique for each message and it is calculated from any given software now let us understand what is step 2 so we need to encrypt the hash that we are out from above message so this is the hash and will encrypt in such a way this is not visible to any third party so this is the signature digital signature step 1 we created the hash and step 2 with encrypted the hash now let us see how has value is calculated there are many software's available if you see this is meeting at 8m is the message and this is the hash value similarly we do a different message that is meeting at 8:00 p.m. and then if you see hash value has been changed even though there is small change in what a2p so has value changes even with slightest changing the message thus it helps in validating the integrity of message now let us take one practical scenario very mr. a there is a sender one to send for message to mr. B recipient so this is the message meeting at 8:00 a.m. so he will send this message along with the digital signature of the message so this is how okay now this digital signature is encrypted by a private key so digital signature should always be encrypted by sender's private key this is the core of digital signature so this is how message moves along with message digital signature moves to mail me mr. B now what mr. B will do he will calculate again hash of the message that is meeting at 8:00 a.m. so his value is for 5 to 6 D now what he will do second step he will decrypt this digital signature with the public key of mr. a and then he will match both the hash value hash value independently calculated by him and then hash value arrived by decrypting by using mr. s public key if both the value matches it means message is fine and it's not been tampered with so this is the core of digital signature so from below example we can say digital signature ensures authentication that is mr. a is the actual center of the payment integrity that the message has not been tampered and non reputation that is now mr. a cannot deny having sent a message but remember digital signature will not ensure confidentiality or privacy of the message now let us discuss some C sub s question answer an explanation hash function will address which of the concern about the electronic message confidentiality integrity availability compression so we already discussed has is basically for integrity of message second question digital signature will address which of the conscience so already discuss digital signature will address authentication integrity and non-repudiation so authentication and integrity will be our answer here it will not ensure confidentiality or privacy of the data digital signature addresses which of the following concerns about the electronic message already discuss integrity hands alteration message has not been altered it will not ensure any archiving or confidentiality or coping concerns which of the following is used to address the risk of hash being compromised few older days in digital signature is created in two ways - step one is to create the hash of the message and to encrypt ahead to protect it from being compromised digital signature provides which of the following already we discussed integrated authentication and non-repudiation each of the following message services provides the strongest evidence in a specific action has been occurred so what here is non-repudiation non-repetition stands for the concern with rain sender cannot deny having sent the message so it's like he need to admit that particular digital signature belongs to him so digital signature required the-- please remember digital signature requires sender's private key for encryption and sender's public key for decryption so both the keys will be required for sender private key will be required for the encryption and public key will be required for the decryption so answer will be signer to her private key of the sender and receiver to her public key of the sender basic difference between hashing and encryption is that here hashing cannot be reversed so from message if we get some hash value from that hash value we cannot convert that hash value into original message so that hash value cannot be reversed but encryption we can encrypt the message and we get them size ciphertext and we can also decrypted ciphertext to get the original message so this is the main difference digital signature ensures that the sender cannot later deny as we already discussed is the term known as non-repudiation fergan adjacent is the digital signature are used when receiving communication from customer so this is done by now here communications are received from customer so customers are the sender so what we require is private key of the sender and the private key of the customer so hash of the data is transmitted and encrypted with a customer's private key in an e-commerce application which of the following should rely on to prove their transaction where actually met again answer will be non reputation is the strongest evidence of the transaction being taken place so a digital signature is created by the sender to prove message integrity by if you remember we already discussed digital signature is created in two step step one is to have hash of the value message and second is encryption of the hash so if you see option a B and D are saying the encryption of the message itself so there is not the case in digital signature in digital signature first hash is created and then there is encrypted thanks for watching