Caesar Cipher - RefactorMyCode.com

A Caesar Cipher, or Caesar Shift, is a simple encryption method which substitutes the letter based on a fixed number movement. An example:

if the shift is set at 1,
than
caesar("ABCDEF",1) #=> "BCDEFG"

def caesar(text,shift)
count = 0
decoded = ''
while(count<text.size)
  decoded << (text[count]+shift).chr
  count += 1
end
decoded
end

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I've always seen shifts done with the unix tr command. You can do the same in ruby. Additionally this method handles the rotation of chars like

caesar("ABCDEF",22) #=> "WXYZAB"

def caesar(text,n)
  alpha = ('A'..'Z').to_a
  n.times { alpha.push(alpha.shift) }
  text.tr('A-Z', alpha.join)
end

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def caesar(text, shift)
  text.split('').collect {|letter| (letter[0] + shift).chr}.join
end

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Modification of Fabien Jakimowicz's code

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def caesar(text, shift)
  text.split('').collect! {|letter| (letter[0] + shift).chr}.join
end