Subject expert in Distributed system security - immediate requirement -- 2
₹1500-12500 INR
Closed
Posted almost 3 years ago
₹1500-12500 INR
Paid on delivery
Dr Watson is worried that a 56 bit key is not long enough, so he has invented a new
combination of DES with a one-time pad.
“You see Holmes” he explains, “the government just chooses a one-time pad R,
exclusive-or’s this pad with the plaintext P, and then encrypts the result under the
first DES key k1. The result is sent by ordinary e-mail to the embassy, and the
ambassador was given k1 before he left the country.”
Holmes is intrigued. “But won’t the embassy also need to know R in order to decrypt
P?” “Ah, that’s the clever bit” says Watson modestly. “The government then
encrypts the pad R under a second shared DES key k2, and sends that to the
embassy as well. The attacker will need to guess both k1 and k2 correctly to
decipher P, and that’s 112 bits! Not only that, but the one-time pad really is
unbreakable, so the ambassador can keep on using the same k1 and k2. “
GàE: E"#(P XOR R), E",(R)
“Oh dear, says Holms sadly, “I think Moriarty would have no more difficulty with your
system than he would with ordinary DES. Embassy messages are very formal, and
we must assume that Moriarty knows the Ambassador’s name and title at least…”
Hi,
I have the experience in Cybersecurity and Network security, I also have more than 6 years of experience in Fortigate and other Firewalls, I can do this project. Please let me know, when to start this project. I'll be waiting for your response.
Thanks.