Check Hash value

A hash function is bi-directional, it allows us to create a fingerprint of a file and also reverse the processes to get the contents of the file Group of answer choices True False

 Block size = 8 bits Hash size = 8 bits Encryption function: Divide the key into two halves: LK and RK; Divide the plaintext into twohalves: LT and RT; Then ciphertext= LC||RC where LC=LK XOR RT; and RC = RK XOR LT;where LC, RC, LT, and RT are each 4 bits; Plaintext and ciphertext are each 8 bits. g(H) = an 8-bit string that is equal to the complement of bits in H; For example, if H=A3 (Hexa)= 10100011 (binary); then g(H)= 01011100 H0 = Initial hash = 11001010   Given a message m: CAB2 (in Hexa);Q1. Determine the hash (in hexadecimal) of the message M using Martyas-Meyer-Oseas hashfunction (Fig. 11.7). Q.2 Determine the hash (in hexadecimal) of the message M using Davis-Meyer hash function(Fig. 11.6) Q.3 Determine the hash (in hexadecimal) of the message M using Migayuchi-Preneel hashfunction (Fig. 11.6)

Block size = 4 bits Hash size = 4 bits Encryption function: Divide the key into two halves: LK and RK; Divide the plaintext into two halves: LT and RT; Then ciphertext= LC||RC where LC=LK XOR RT; and RC = RK XOR LT; where LC, RC, LT, and RT are each 2 bits; Plaintext and ciphertext are each 4 bits. g(H) = a 4-bit string that is equal to the complement of bits in H; For example, if H=A (Hexa) = 1010 (binary); then g(H)= 0101 H0 = Initial hash = C (in Hexa) Given message M:  D9 (in Hexa); a. Determine the hash (in hexadecimal) of the message M using Martyas-Meyer-Oseas hash function  b. Determine the hash (in hexadecimal) of the message M using Davis-Meyer hash function  c. Determine the hash (in hexadecimal) of the message M using Migayuchi-Preneel hash function

Hashes are better than file encryption for passwords.

cryptography in hash function

Since hashing passwords in a file is a far better idea than encrypting the password file, it is the method of choice.

What advantages does hashing have over encryption when it comes to keeping passwords on file?

Hash Search Design a hash table which the phone number is the key word and can be used to do search. The phone number is looked on as key and thus the hash function should be designed based on it. Basic Requirements 1) Each record contains 3 data items, i.e. name, sex and phone number.   2) Read the datum from txt file, use phone number as the key to design hash function, using open addressing method to solve conflicts. Build hash table and show highest number of hashes. There are 450 records in total, and the size of hash table is defined as 467. The maximum number of hashes is required to be no more than 80   3) When the user input a phone number, your program should do hash search based on this number. If the number dose exist then the corresponding information should be shown, and the number of hashes should be shown as well. If the number does not exist in the table, still show the number of hashes and the information    My data LiuJing Female 13814231733 WangAnqi Male 15855129526…

Computer science What is the purpose of the hash function? And how does it work?

Since hashing passwords in a file is a far better idea than encrypting the password file, it is the one that is ultimately picked.

Password Cracking   Each student should be able to access* one PassXX.hash file.  This file contains 4 unsalted md5 password hashes (md5 is commonly used for hashing passwords, though it is a bit weak for modern use.  It is very important to salt passwords before hashing them, since leaving them unsalted makes them easier to crack.  However, many sites fail to do this). Your assignment is to use Hashcat (or another password cracking or password "recovery" tool) to retrieve the original passwords from the hashes, and submit the password/hash pairs. Each set of hashes contains 1 very easy password and 3 slightly challenging passwords of differing format. Link to hashcat: https://hashcat.net/hashcat/   Note: You will also need one or more dictionaries to perform a dictionary attack. *access: Files are accessible based on your last name. You should see a large number of files that are not accessible due to your account having a wrong last name, and one file that is accessible that lacks…

Assume you have a hash table length of 29. Given the value 371, what index will the entry map to? 29 371 23 None of the above

Digital forensics: Suppose that we a record but not sure which one is the original one and which one has been modified: A) Bob leaves the hotel at 7:00 pm B) Bob leaves the hotel at 6:00 pm Fortunately, we have the hash value of the original record, calculated by SHA-256: 2655a8151189efae706db96460d368ab6adb9f5a1b88e5aa5c6ea18ba65beadd Please tell us which one is the original one, A or B?  (Hint: You can use the SHA-256 calculator at https://xorbin.com/tools/sha256-hash-calculator).

Hash Function

Why is hashing better than encrypting passwords for file storage?

When a string is salted, as part of the PHP authentication process, extra characters (known only by the programmer/s) are added to the string before performing hash conversion.

Why is hashing better than encryption when a password must be stored in a file? The function of a password file, and how to use it, are both explained.

Why is hashing passwords preferable than encryption when storing passwords in a file?

A hash function should be independent of the capacity of the hash table. Select one: a. False O b. True

Hash Search Design a hash table which the phone number is the key word and can be used to do search. The phone number is looked on as key and thus the hash function should be designed based on it. Each record contains 3 data items, i.e. name, sex and phone number. Read the datum from txt file, use phone number as the key to design hash function, using open addressing method to solve conflicts. Build hash table and show highest number of hashes. There are 450 records in total, and the size of hash table is defined as 467. The maximum number of hashes is required to be no more than 80 When the user input a phone number, your program should do hash search based on this number. If the number dose exist then the corresponding information should be shown, and the number of hashes should be shown as well. If the number does not exist in the table, still show the number of hashes and the information: this number not exist        In doing this the program should be done in C and it should be…