If it has become feasible to use brutal force solution to try almost up to 230 random messages and to obtain identical messa; minimum number of bits should a hash be in order to remain secure? QUESTION 22 How to encrypt a message with hashing? First concatenate a security key with some additional values, then XOR the results with the message Hash the message, then rehash the result. Repeat multiple times. impossible. First concatenate the message with a security key, then hash them together