루비구현(시저암호)

#루비로 구현한 시저암호
Random.new_seed

# Generate a number from 1 to 25
# Including 25
def KeyRandomGenerator()
  key = (rand()*10).to_i
  return key
end

# field setting
alphabat = Array.new# => []
index = 97..122
for i in index
  alphabat<<i.chr
end
len = 0...alphabat.length
print alphabat
puts
print "plaintext is "
plaintext = gets()#평문입력
secretKey = KeyRandomGenerator()

range = 0...plaintext.length
#puts plaintext[0]
puts secretKey

#puts str.include?("kim")
cipherText=Array.new# => []
for i in range
  #printf는 자동 줄바꿈을 하지 않는다.
  #puts는 자동 줄바꿈한다.
  if(alphabat.include?(plaintext[i]) == true)
    for j in len
      if(plaintext[i] == alphabat[j])
        num_index = (j+secretKey)%alphabat.length
      end
    end
    cipherText << alphabat[num_index]
  else
    cipherText << plaintext[i]
  end
  
end

print(cipherText)