EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Expert Solution & Answer
Chapter 2, Problem R21RQ
Explanation of Solution
File sharing using BitTorrent:
BitTorrent:
A communication protocol for peer to peer file sharing which is used to distribute data and electronic files over the internet.
P2P Files sharing application stands for Peer to Peer file sharing applications which use P2P file transfer protocol to allow users to access and share media files using peer to peer networking technology...
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Students have asked these similar questions
Suppose N people want to communicate with each of N – 1 other people using symmetric key encryption. All communication between any two people, i and j, is visible to all other people in this group of N, and no other person in this group should be able to decode their communication. How many keys are required in the system as a whole? Now suppose that public key encryption is used. How many keys are required in this case?
Alice encrypts a message using AES, and sends the ciphertext to Bob. Unfortunately, during the calculation of the third block, a lightning struck Alice’s house, corrupting the 2nd bit of the AES output (for the third block). Fortunately, nothing else of the calculation was affected. How much of the plaintext can Bob still recover if the mode of encryption is one of the followings: CBC, CFB, OFB, or CTR?
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encryption. All communication between any two people, i and j, is visible to all other people in
this group of N, and no other person in this group should be able to decode their communication.
How many keys are required in the system as a whole? Now suppose that public key encryption
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Chapter 2 Solutions
EBK COMPUTER NETWORKING
Ch. 2 - List five nonproprietary Internet applications and...Ch. 2 - Prob. R2RQCh. 2 - Prob. R3RQCh. 2 - Prob. R4RQCh. 2 - Prob. R5RQCh. 2 - Prob. R6RQCh. 2 - Prob. R7RQCh. 2 - Prob. R8RQCh. 2 - Prob. R9RQCh. 2 - Prob. R10RQ
Ch. 2 - Why do HTTP, SMTP, and POP3 run on top of TCP...Ch. 2 - Prob. R12RQCh. 2 - Prob. R13RQCh. 2 - Prob. R14RQCh. 2 - Prob. R15RQCh. 2 - Prob. R16RQCh. 2 - Prob. R17RQCh. 2 - From a users perspective, what is the difference...Ch. 2 - Prob. R19RQCh. 2 - Prob. R20RQCh. 2 - Prob. R21RQCh. 2 - Prob. R22RQCh. 2 - Prob. R23RQCh. 2 - Prob. R24RQCh. 2 - Prob. R25RQCh. 2 - In Section 2.7, the UDP server described needed...Ch. 2 - Prob. R27RQCh. 2 - Prob. P1PCh. 2 - Prob. P2PCh. 2 - Prob. P3PCh. 2 - Prob. P4PCh. 2 - Prob. P5PCh. 2 - Prob. P6PCh. 2 - Prob. P7PCh. 2 - Prob. P8PCh. 2 - Prob. P9PCh. 2 - Prob. P10PCh. 2 - Prob. P11PCh. 2 - Prob. P13PCh. 2 - Prob. P14PCh. 2 - Prob. P15PCh. 2 - Prob. P16PCh. 2 - Prob. P17PCh. 2 - Suppose you can access the caches in the local DNS...Ch. 2 - Prob. P21PCh. 2 - Prob. P22PCh. 2 - Prob. P23PCh. 2 - Prob. P25PCh. 2 - Prob. P26PCh. 2 - Prob. P27PCh. 2 - Prob. P28PCh. 2 - Prob. P29PCh. 2 - Prob. P30PCh. 2 - Prob. P31PCh. 2 - Prob. P32P
Knowledge Booster
Similar questions
- Help me pleasearrow_forwardQ20. Suppose that a security specialist and a remote command team are using the RSA cryptosystem to send a message. The command team selects p = 12 and q = 5. Assume e is chosen to be 8. What is the value of N?arrow_forwardSuppose Bob receives a PGP message from Alice. If Bob receives a message, how does he know it was delivered by Alice and not, say, Trudy? Does PGP use a message authentication code (MAC)?arrow_forward
- Alice needs to transmit a 48-bit message using a 47-bit key. Suggest a scheme that is perfectly secure.arrow_forwardSuppose a plaintext message x is encrypted using the Caesar cipher b = a +26 10 where each letter of the alphabet is assigned a numerical value (A = 0, B = 1, C = 2, ..., Z = 25), the variable a represents the numerical value of a letter in x, and b represents the numerical value of the corresponding letter in the ciphertext message y. If y = WKDR SC MYYV, then decrypt y to obtain the plaintext message x. Enter the decryption of each letter of y in the boxes below. NOTE: All answers should be capitalized and do not insert extra blank spaces. W → K →→ D→ R→ S→ C → M→ Y → Y → RemakingMIN... V →arrow_forwardIf we have a UDP packet that sent from port 42,768 to port 42,773 containing a message of exactly bytes "HELO" (coded in 8-bit ASCII). What will be the value in the checksum field.arrow_forward
- Suppose a key space of 230. Alice decides to encrypt a plaintext block 6 times with 6 different keys. What is the effective key space for Trudy?arrow_forwardSuppose that Bob receives a PGP message from Alice. How does Bob know for sure that Alice created the message (rather than, say, Trudy)? Does PGP use a MAC for message integrity?arrow_forwardSuppose a message is 13500 bits long. If it is to be encrypted using a block cipher of 128 bits, find both the size of the padding and the number of blocks needed.arrow_forward
- Consider the case of Alice sending a message, m, to Bob. Both Alice and Bob use public key cryptography and each has a public and private key as described in the text. The figure attached below shows the operations that Alice must perform to provide confidentiality, authentication, and integrity when sending a message to Bob over the network. We can use either symmetric key or public key cryptography to encrypt a message. For our purposes, either technique will encrypt the message, and applying both doesn't make it "more secure". Also, we can assume that the session key would remain a secret so the fact that it is discarded does not make it "more secure". Why do we use a session key, Ks, instead of relying only on public key Cryptography? In other words, why do we use both public key and symmetric key cryptography?arrow_forwardQuestion 2: You are Alice. Bob publishes his ElGamal public key (q, a, ya) = (101, 2, 14). You desire to send the secret message “CALL ME” to Bob. Using the equivalence A = 01, B = 02, and so on up to Z = 26, you encode the message into the number 03 01 12 12 13 05. Regarding each of these two-digit numbers as a plaintext block, compute the message that you will send to Bob using his public key. This requires you to pick a “random” number k; use k = 32. You are Bob. You get a message from Alice. You like Alice a lot, so you are eager to read the message. Use your secret key (101, 2, 10) to decrypt Alice’s message. Notice that you don’t need to know what value of k Alice used in order to do this.arrow_forwardcipn appical Lhe sa Typion 8.9. Suppose you observe a CBC ciphertext and two of its blocks happen to be identical. What can you deduce about the plaintext? State some non-trivial property of the plaintext that doesn't depend on the encryption key.arrow_forward
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