What's the difference between a dictionary attack and a brute-force attack? Brute-force attacks use the most common passwords and wordlists (of varying languages) whereas a dictionary attack uses a tool that attempts every letter-number (sometimes special chara O attempt to guess the password. Brute-force attacks use a tool that attempts every letter-number (sometimes special character) combination in an attempt to guess the password whereas a dictionary attack uses the most co O wordlists (of varying languages). O Brute-force attacks utilize a limited number of attempts and/or instate a time limit before giving up whereas a dictionary attack uses an unlimited number of attempts until cracking the passwo JESTION 64 Which is NOT a block cipher for AES encryption? O AES 192 O AES 64 O AES 256 O AES 128

What's the difference between a dictionary attack and a brute-force attack? Brute-force attacks use the most common passwords and wordlists (of varying languages) whereas a dictionary attack uses a tool that attempts every letter-number (sometimes special chara O attempt to guess the password. Brute-force attacks use a tool that attempts every letter-number (sometimes special character) combination in an attempt to guess the password whereas a dictionary attack uses the most co O wordlists (of varying languages). O Brute-force attacks utilize a limited number of attempts and/or instate a time limit before giving up whereas a dictionary attack uses an unlimited number of attempts until cracking the passwo JESTION 64 Which is NOT a block cipher for AES encryption? O AES 192 O AES 64 O AES 256 O AES 128

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Answer the following: a) Compare and contrast dictionary attacks to brute force attacks. Recommend your choice with rationale if you must crack an encrypted password. b) Discuss how you can secure the hashed password database on an authentication server.
Provide a solution to the issue outlined below by identifying the security weaknesses in each of the authentication methods.When Bob hashes a password, he compares it to a list of previously hashed passwords in a database.Bob performs a hashing technique on a password and then compares it to a database of hashed passwords.
For each kind of authentication, explain the danger and provide a countermeasure.Bob uses a hashing algorithm to check a password against a collection of previously hashed passwords.Bob uses a database of double-hashed hashes to check a user's password against their own.
Consider the following threats to Web security and describe how each is countered by a particular feature of TLS. A. Brute-Force Cryptanalytic Attack: An exhaustive search of the key space for a conventional encryption algorithm. B. Known Plaintext Dictionary Attack: Many messages will contain predictable plaintext, such as the HTTP GET command. An attacker constructs a dictionary containing every possible encryption of the known-plaintext message. When an encrypted message is intercepted, the attacker takes the portion containing the encrypted known-plaintext and looks up the ciphertext in the dictionary. The ciphertext should match against an entry that was encrypted with the same secret key. If there are several matches, each of these can be tried against the full ciphertext to determine the right one. This attack is especially effective against small key sizes (e.g., 40-bit keys). C. Replay Attack: Earlier TLS handshake messages are replayed. D. Man-in-the-Middle Attack: An…
Question 2 Please implement a statistical attack for Caesar Cipher by computing Correlation: ?(?)|?=[0,25] based on slides L7 pages 16-19. Use your implemented attack to infer the key and the plaintext for the following cipher texts a. XTKYBFWJXJHZWNYD b. KCECMKS Full explain this question and text typing work only thanks
What is the concept of "salting" in the realm of password hashing, and why is it important?
1- Consider password authentication :(a) Suppose an off-line dictionary attack is used, and suppose the attacker has prepared a dictionaryof 10,0000 entries, the password file contains 1000 users with 50 different salt values(Salt valuescorrelation to user accounts attackers is unknown to the attacker). If the attacker’s goal is to get asmany passwords as possible, how many hash values would the attacker compute in the worst case?(b) Based on the above part, how many comparisons between hash values are needed in the worse case? 2- A Digital Certificate usually contains an identity and other fields such as certificate issuer’sname .. etc :(a) Explain the process for a service owner (i.e. web application) to get a Digital Certificate ?(b) How does the Digital Certificate issued in part(a) enable any end user to detect the man in themiddle attack?(c) What is the impact on the validity of the Digital Certificate if the hash algorithm used is not weakcollision resistant? Justify your answer…
Question # 1: Use the Multiplicative Cipher method to encrypt the following plaintext:We will succeed in our ventureKey length K = 7 You must show all the steps of your workQuestion # 2: Use the additive cipher with key = 15 to decrypt the message “WTAAD”.You must show all the steps of your work Question # 3: Use the concept of a one-way hash function to encrypt the following name into a 9 x 9 -dimensional database table. Jonathan Leea) How many rows and columns are there on this tableb) Which indices is Jonathan on this tablec) Why are hash functions relevant in database encryption?d) What would you do to remedy the problem of index congestion on your database?You must show all the steps of your work Question # 4: Use the multiplicative method to decrypt the following ciphertext.MADWU Key = 5You must show all the steps of your workQuestion # 5: use the XOR technique to encrypt the following statement before transmission: The quick brown fox jumps over the lazy dog
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Database systems are exposed to many attacks, including dictionary attack, show with implantation how dictionary attack is launched?(Java or Python)