A bank wants to store the account number of its customers (an 8- digit number) in encrypted form on magnetic stripe ATM cards. Discuss the security of the following methods for storing the account number against an attacker who can read the magnetic stripe:

a. Store a cryptographic hash of the account number.
b. Store the ciphertext of the account number encrypted with the bank's public key using a public-key cryptosystem.
c. Store the ciphertext of the account number encrypted with the bank's secret key using a symmetric cryptosystem.

(because i need 20 chars)

the correct answer is: a.)it is never appropriate to use acronyms and emoticons in business communication.

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.