CaraCara

puts "Please input the alpha characters to remove: "	#Simply asking for input of letters to remove.
removals = gets.split('')				#Gets the alpha characters, without any seperation, and splits them into an array.
#removals.pop						#Input takes RETURN as character in array, pops off the stack.
puts removals						#Showing nothing unusual.
puts "Please enter something to remove alpha character from: "	#Asking for sentance 'block' of text to de alpha characterize.
block = gets						#Block = Input
mutated = block.tr(removals.to_s, "")			#Holding it after the array converted to a string, and replaced in block text.
puts mutated						#Show me the money
finale = (block.split('') - mutated.split(''))		#Compares the entered block, and the mutated block.
finale.delete(" ")					#Delete spaces from array so we can have it nice and neat.

CaraCara

require 'openssl'
require 'digest/sha2'
# This encryption/decryption routine is borrowed from someplace online, I will annotate where later, but the basis of the encryption/decryption is typical openssl useage in Ruby from what I can gather.
payload = "puts 'Plans for Blofelds newest Doomsday Device. This is top secret!'"# 99,9% of the text is in tact a stray " ' " was causing me issue, so I removed it, and the puts is obviously for testing execution. This was left in tact to aid in verifying where the encryption/decryption routine was from.
sha256 = Digest::SHA2.new(256)
aes = OpenSSL::Cipher.new("AES-256-CFB")
key = sha256.digest("15") #Set this to be something simple and so it could overshoot to prove it was not just sequential.
#IV Was left out as this is just to prove the feasability. In actuality it could be randomized as much as wanted.
aes.encrypt
aes.key = key