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"Julius Caesar"

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Hex New Member Posts: 19	"Julius Caesar" Jun 6, 2017 9:17:33 GMT Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Hex on Jun 6, 2017 9:17:33 GMT DIFFICULTY: EASY Given "Wjajwxj Hnumjw", a shift cipher encrypted string, write an algorithm that reverses the shift cipher and outputs two meaningful words derived.
	Last Edit: Jun 6, 2017 9:54:22 GMT by Hex

cntkillme
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"Julius Caesar" Jun 12, 2017 10:32:05 GMT Hex likes this

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Post by cntkillme on Jun 12, 2017 10:32:05 GMT

ANSWER: Reverse Cipher

Key: -5

local enc = [[Wjajwxj Hnumjw]]

local BAU = string.byte('A')
local BAL = string.byte('a')

for key = 0, 25 do
	local dec = enc:gsub("%a", function(v)
		v = v:byte()
		if v < BAL then -- upper
			v = BAU + ((v - BAU) + key)%26
		else
			v = BAL + ((v - BAL) + key)%26
		end

		return string.char(v)
	end)

	if key > 12 then -- shortest path passed 12 would be going backwards
		print(key - 26, dec)
	else
		print(key, dec)

	end
end

Last Edit: Jun 12, 2017 10:33:50 GMT by cntkillme

We have moved! Find our active server with over 6,500 members at https://discord.gg/scf

Last updated 30th April 2020

We have moved! Find our active server with over 6,500 members at https://discord.gg/scf

"Julius Caesar"

Post by Hex on Jun 6, 2017 9:17:33 GMT

Post by cntkillme on Jun 12, 2017 10:32:05 GMT

We have moved! Find our active server with over 6,500 members at https://discord.gg/scf