Fermé

Distributed system security

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…”

Compétences : Security Systems, Sécurité Informatique, Sécurité Web, Computer Science, Systems Engineering

En voir plus : a marketing manager have two option to adopt neither to adopt mass marketing or target marketing for it new product you are requ, e mail dr ljubenov yahoo com, new e mail id creation, ​​NOTE: If few words are new to you then please google it to understand the context. , how long did it take you to learn android programming, huey p long bridge new orleans, how long does it take you to write a 4 page paper, how long before proposing should you buy the ring, you won t be able to install new themes from here yet since your install requires sftp credentials, i need a new job and don't know what to do, long beach matters to you, how long did it take you to become a web developer, warning java can t force a new processing round lombok won t work, how long does wordpress lock you out for, mya new song you got me, i want to do something new with you lyrics, i wanna do something new with you song, pseg long island new service, how long will new orleans last

Concernant l'employeur :
( 144 commentaires ) Jaipur, India

Nº du projet : #30090822

1 freelance fait une offre moyenne de ₹5556 pour ce travail

Dineshom

I have 5 years experience in system security, contact me we could speak further details, you can trust me

%bids___i_sum_sub_32% %project_currencyDetails_sign_sub_33% INR en 1 jour
(0 Commentaires)
0.0