Thank you so much sir. I was trying to understand this for last 3-4 hours but everywhere it was over complicated but thanks to you now i'm clear. Thank you again teacher because you are providing and sharing your precious knowledge with us. I'm so inspired by you after seeing you teaching with this passion. Best wishes sir.
Waw awwsome...sir if you guys coming after reading books either kurose and ross or fourozen this is best lecture you found go for it with 1.25× speed.Tq sir
Thank you so much sir. I was very fear about this topic but everywhere it was over complicated but thanks to you now i'm clear. Thank you again teacher because you are providing and sharing your precious knowledge with us.............. I'm so inspired by you after seeing you teaching with this passion. Best wishes sir.
Sir your lectures were really very helpful. You are an outstanding teacher. I would like to suggest that after explaining each of the authentication methods or cipher algorithms you should have explained their advantages and disadvantages. That would have given us more insight. Thanks
superb teaching sir am following your lecturs for network security the explaination is very simple and easy to understand simply superb........Thank you very much sir
Sir you have helped me a lot sir during my exams time. Your explonation is very goood and clear. Keep maintian that sir. You are one of the best teacher in my study career. I was scared about this subject and i found you on youtube. Now i learned lot of subject. Thank you very much sir.
Wow you are a gem... need more people like u in the teaching field who have passion to educate people...I have decided to watch every lecture of yours irrespective of being relevant to my domain of work, I feel I can learn a lot of new things from you... lots of respects and love... thank you!!
hi kulkarni thank you very much. thanks for your interest towards our channel and share my sessions with your friends and subscribe to our channel.Keep following our channel.
@@sundeepsaradhi thank you sir, well explained kindly sir am requesting a tutorial about Pluggable Authentication Modules (PAM) your positive response I will be highly appreciate💪💪💪
Sir, your teaching is really very good, understandable. Please sir also make a separate video for has function, universal hashing and also perfect hashing also.
36:00 there is no need to encrypt hash code separately as the entire plain text and hash are encrypted using the key only known to those 2 people. You encrypt the hash code only when the message is sent in plain text format because anyone can modify the PT and recompute the hash code and the receiver doesn't know if the hash is not encrypted.
Sir. Your classes are excellent. Good to polish fundamentals. Could u give me examples (names) of some algorithm for 2nd and 3rd methods( for Message Authentication Codes and Hash Codes).
sir I have a doubt in hash code. in case-2 of hash code the hash code was decrypted by public key of A.Which is available for all users and anyone can decrypt it.there is no use of private key.How this can be achieved.
hi sachin thanks for your interest towards our channel and share my sessions with your friends and subscribe to our channel.Keep following our channel.
26:00 if we want only authentication, then what's the point of encrypting the plain text. Only encrypting the MAC is enough. If someone wants to change the PT then he cannot recalculate the MAC and modify it as he won't have the key to encrypt it. edit: oh, that's what hash functions do.
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Sir can you please tell how come the authentication is achieved in 3rd case of message encryption because there reciever is not recognised by the sender and as you say for authentication both should recognise each other so it fails as per that concept🙄
just can you correct me if iam worng hash function is md5 , sha , hmac the first one without shared secret key is md5 or sha the second one with using shared key is hmac
hi naresh thanks for your interest towards our channel and share my sessions with your friends and subscribe to our channel.Keep following our channel.
hi here the Receiver should know whether the received message is sent from valid and authorized user and this process is called authentication and also the message should not be altered during the transmission and this process is called Integrity. In order to achieve authentication and integrity we will use authentication and hash functions. Hope your doubt has been clarified.
As the public key for all the users will be same for a particular message, then what is meant by encrypting with userA private key and decrypting with userB public key. i mean any user can decrypt with public key of that particular message right.
hi prasad in two ways we can perform this encryption and decryption 1. encrypting with userA private key and decrypting with userB public key. (here there is no confidentiality as any one can decrypt the message because of using public key which will be available with all users) 2. encrypting with userB public key and decrypting with userB private key. (here there is no authentication as any one can send the message because of using public key for encryption) so in order to achieve both we need to apply the dual encryption and dual decryption by combining these two methods one after another. so that we can achieve both confidentiality and authentication. encrypting with userA private key and then again encrypting using UserB public Key decrypting with userB private key and then again decryption using UserA public key.
hi Brijesh thanks for your interest towards our channel and share my sessions with your friends and subscribe to our channel.Keep following our channel.
hi harsha thanks for your interest towards our channel and share my sessions with your friends and subscribe to our channel.Keep following our channel.
Hi Sundeep, I have a doubt in MAC concept.. Here you are using key to generate MAC, so the key is a Public key or Private key. How does key exchange happen if same key used to encrypt and decrypt
hi sindhu in MAC the key is secret key ( not public or private ) and the same key should be used at receiver side.The key may be exchanged using Diffie Hellman key exchange or other exchange algorithms. Hope your doubt has been clarified.
I'm confused...you said no key for hash but in the last type of hash function you have used key for both the hash code and the message... please explain :/
Hi In order to generate hash code we need not use of key on plain text but for acheiving the confidentiality we will encrypt the plain text along with hash code. Hope your doubt has been clarified.
