Which of the following is considered a token?
password hash
password
encryption key
rfid chip implanted
password
This factor refers to information that you can (physically) carry with you. For example, before you send money to someone, many banks will ask you for a token (also referred to as one-time password and usually 6–8 digits long) that expires either after first use or after 30 seconds.
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Which of the following is considered a token? password hash password encryption key rfid chip implanted
1. This project will extend Project 3 and move the encryption of a password to a user designed class. The program will contain two files one called Encryption.java and the second called EncrytionTester.java. 2. Generally for security reasons only the encrypted password is stored. This program will mimic that behavior as the clear text password will never be stored only the encrypted password. 3. The Encryption class: (Additionally See UML Class Diagram) a. Instance Variables i. Key – Integer...
Why is symmetric encryption also called private key cryptography? Describe the steps for a user named Mike to send a digitally signed message to a user named Sophie. List the four characteristics a hash algorithm should have if it is to be considered secure.
Cryptographic hash functions are very commonly used in password verification. For example, when you use any online website which requires a user login, you enter your E-mail and password to authenticate that the account you are trying to use belongs to you. When the password is entered, a hash of the password is computed which is then sent to the server for verification of the password. The passwords stored on the server are actually computed hash values of the original...
We have considered encryption, and in particular, the algorithm and underlying theory of the Advanced Encryption Standard (AES). 3.1. What is the Advanced Encryption Standard? 3.2. What is a Certificate Authority? 3.3. What is meant by a public key and how is such a key used? 3.4. Consider a very simplified model of AES in which there will be only one P box and one S box and an 8 bit key. Use 0xBC as the key. Show, step by...
Key backup is an important and seldom considered issue. As we describe in this chapter, the holder of an encryption key can be sick, unreachable, or otherwise unavailable. Major organizations have a contingency plan for handling such emergencies. Suggest ways that an organization could prepare for a needed key being unavailable. Would your plan also work for needed passwords or other critical data? That is, a critical file might be protected by a password, but the person who knows the...
Alice has stolen a user password hash database. Alice knows the password policy rules are as follows: passwords must be longer than 8 characters and shorter than 11. Must contain a numeric digit, and must contain a symbol character. All passwords are stored salted. Which one of the following password cracking techniques would guarantee eventual success? English language dictionary attack Rainbow table attack Man in the middle attack Brute force attack
1.Which of the following statements about asymmetric-key encryption is correct? a When using asymmetric-key encryption method, a total of two keys are necessary in electronic communication between two parties. b Employees in the same company share the same public key. c Most companies would like to manage the private keys for their employees. d Most companies would like to use a Certificate Authority to manage the public keys of their employees. e Two of the above are correct. 2 Which...
T/F. An attacker who steals an organization’s user’s password hash can use it, without decrypting it, to authenticate to other systems on the network through what’s considered to be a “pass-the-hash” attack. T/F. The Ntuser.dat file loads registry information for the current user logged onto a system in the HKEY_CURRENT_USER (HKCU) registry hive. T/F. Forensic analysis of memory allows cyber security researchers to examine malware, which otherwise might not be accessible due to file packing and other anti-forensic techniques the...
COSC 359
User Authentication
Description
A widely used password security technique is the use of hashed
passwords and a salt value. This scheme is found on virtually all
UNIX variants as well as on a number of other operating systems as
shown in Figure 3.1 bellow.
To load a new password into the system, the user selects or is
assigned a password. This password is combined with a fixed-length
salt value. In older implementations, this value is related to the...
Which of the following is not true about the token concept? 1The token concept is a theoretical concept that describes process flow. 2The start event generates a token. 3The end event consumes the token. 4Tokens do not traverse message flows. 5All of the choices are true.