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# Question: encryption computer science im posting the directions first and then...

###### Question details

Encryption Computer Science I'm posting the directions first and then the question to help.

"For all the remaining questions, we will work with the following toy encryption scheme. It encrypts plaintexts that consist of only uppercase letters and the underscore character (27 characters total):

ABCDEFGHIJKLMNOPQRSTUVWXYZ_

Note that the underscore character is part of the alphabet and will also be encrypted. A key in this scheme consists of 4 digits, each from 0 to 9. Each digit tells how much to shift one character, that is, change it to the character that many positions later in the alphabet. If the shift goes past '_', then we wrap around to the beginning.

The key is applied separately to each group of 4 letters in the message. For example, if the message HI_SALLY is encrypted with the key 2407, the H would be shifted by 2, the I by 4, the underscore by 0, and the S by 7. Then we would start over with the first digit of the key, shifting A by 2, L by 4, and so on. So the ciphertext would be: JM_ZCPLE."

1. Give the encryption of the following messages with the key 3654.

1. SELL_AAPL

1. FRANK_IS_MOLE

1. DEPLOY_ALL_DIVISIONS