what security objectives have been fulfilled in the following scheme ? And why ? (E K E(K, [M || H(M || S)]) H.
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Q: The solution in its simplest form using C++?? ^^^^^^^^^^^^^^^^^^^^
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Q: mark the correct alternative that corresponds to the Hash cryptographic system definition
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A: Answer
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Q: suppose p=5 and q=11. what is the private key of an RSA cryptosystem with public key (n,e)= (55,9)?
A: Lets see the solution.
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Q: h of the following ment is false regarding word protection?
A: Q
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A: ANSWER:-
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- What category does the following issue fall into as an O/S responsibility? attempting to access int x[x.length] unable to determine protection security33. Lamport's one-time password scheme users the passwords in reverse order. Would it not be simpler to use f (s) the first time, f(f(s)) the second time, and so on?What is the security requirement on password hashing? Given a password w, its hash is calculated as . This question is about the security requirement on function h. (a) Can we use any function as h for password hashing? For example, can we use the "mod 100" function, which is a common computer science function? (Given any integer value x, "mod 100" function works by "x mod 100," which is a value between [0, 99]; for example, if x = 105, x mod 100 = 5; x = 1000000, x mod 100 = 0;) (b) If not, what is the security requirement on h?
- Step 1 Intro Cipher block chaining mode in DES (Date Encryption Standard): It is a type of cipher mode where all the cipher blocks are chained to avoid the replacement of blocks. In this model, all the blocks are chained before encryption; the plaintext in a block is XOR (Exclusive OR) with a cipher text of the previous bloc. Here, the key advantage is that the output present in the cipher text block is not the same as the plaintext block. arrow_forward Step 2 Solution: Cipher feedback mode in DES (Data Encryption Standard): This type of mode is used to encrypt the data by byte-to-byte. It is similar to the cipher block chaining mode, if the encryption process in cipher block chaining is reversed, it is the decryption process of Cipher feedback mode. During the encryption process, one byte is encrypted first and sent out. Then the encryption process is carried out with the next byte. Conclusion: The output stream generated by the encryption process in cipher…Cryptography is the area of mathematics intended for the study of techniques and principles for transforming information from its original form to another, unintelligible form, so that it can be used only when authorized. Based on the presented cryptographic definition, mark the correct alternative that corresponds to the Hash cryptographic system definition: A) Cryptographic process that does not guarantee the non-repudiation of communication; B) Computer file that contains a set of information regarding the entity to which the certificate was issued; C) Standard-length cryptographic digest generated by math functions and hash tables D) Public/private key pair that are shared and used for encryption and decryption; E) Single private key that is shared and used for encryption and decryption.What will be the ciphered text corresponding to “ALGORITHM” if bifid cipher is used for encryption with key as “KEY” with a period as 5? a) SBPISZTKZH b) PLNSOWGKQM c) SELFQEXBHM d) YFSGWNFBW
- Exercise 2 (MAC schemes derived from block ciphers( Let E denote the family of encryption functions for a block cipher where plaintext blocks, ciphertext blocks, and keys are each n = 80 bits in length. Let H {0, 1} {0, 1}" be a hash function. Assume that plaintext messages m all have bit-lengths that are multiples of n; we write m = (my, m₂,...,m), i.e. m is composed of t blocks m, of n bits each. Consider the following MAC schemes, each using an n-bit secret key k. 1. MAC (m) = ₁, where co = 0, and c, =c-1m, Ex(m) for 1 ≤ i ≤t. 2. MAC (m) Ek(H(m)). Are any of these MAC schemes secure? Justify your answer and clearly state any assumptions you make.Exercise 2 (MAC schemes derived from block ciphers ( Let E denote the family of encryption functions for a block cipher where plaintext blocks, ciphertext blocks, and keys are each n = 80 bits in length. Let H: {0,1} {0, 1}" be a hash function. Assume that plaintext messages m all have bit-lengths that are multiples of n; we write m = (m₁, m₂,...,m), i.e. m is composed of t blocks m, of n bits each. Consider the following MAC schemes, each using an n-bit secret key k. 1. MAC (m) = ct, where co= 0, and c = c-1m, E(m) for 1 ≤ i ≤t. 2. MACk (m) Ek(H(m)). = Are any of these MAC schemes secure? Justify your answer and clearly state any assumptions you make.Please provide, thank you!
- Network Security problem Q1] Consider the RSA encryption algorithm. Suppose that a malicious user intercepts the ciphertext C = 18 that is being sent to Alice. If Alice's public key PUa = {5,35) is known by the malicious user, show how the malicious user will recover the plaintext M? [Hint: find M=?] Note: C stands for Ciphertext, M stands for Message (Plaintext), PUa stand for Alice's public key.Develop a software authentication module for your software (any type of and in anyprogramming language). Use a hash algorithm to obtain a hash code of user passwords.I) Store only hash code instead of raw passwords (identification). II) When a user requests an authentication, for an attempt to verification, create a hashcode of password and compare the stored one. III) If a match occurs, then authenticate the user. If authentication fails, inform the userproperly.[8_A_1] Please answer the following question. Please don't just answer the "True" or "False". Answer them with detail explanation.