Simple Doggy OS Encryption algrothim

-- Text Encryption Jambler in ComputerCraft
-- This script will encrypt and decrypt text using a simple substitution cipher

-- Function to generate a key for encryption and decryption
function generateKey()
    local chars = {}
    for i = 32, 126 do -- ASCII range for printable characters
        table.insert(chars, string.char(i))
    end

    local key = {}
    while #chars > 0 do
        local index = math.random(#chars)
        table.insert(key, table.remove(chars, index))
    end

    return key
end

-- Function to create a map from a key
function createMap(key)
    local map = {}
    for i = 32, 126 do
        map[string.char(i)] = key[i - 31]
    end
    return map
end

-- Function to invert a map
function invertMap(map)
    local invMap = {}
    for k, v in pairs(map) do
        invMap[v] = k
    end
    return invMap
end

-- Function to encrypt text using a key
function encrypt(text, key)
    local map = createMap(key)
    local encrypted = {}
    for i = 1, #text do
        local char = text:sub(i, i)
        table.insert(encrypted, map[char] or char)
    end
    return table.concat(encrypted)
end

-- Function to decrypt text using a key
function decrypt(text, key)
    local map = invertMap(createMap(key))
    local decrypted = {}
    for i = 1, #text do
        local char = text:sub(i, i)
        table.insert(decrypted, map[char] or char)
    end
    return table.concat(decrypted)
end

-- Main Program
local tArgs = {...}
if #tArgs < 1 then
    print("Usage: jambler <encrypt|decrypt> <text>")
    return
end

local mode = tArgs[1]
local text = table.concat(tArgs, " ", 2)

-- Set a fixed key for simplicity. In a real scenario, this should be securely shared or dynamically generated.
local key = generateKey()

if mode == "encrypt" then
    local encryptedText = encrypt(text, key)
    print("Encrypted Text: " .. encryptedText)
elseif mode == "decrypt" then
    local decryptedText = decrypt(text, key)
    print("Decrypted Text: " .. decryptedText)
else
    print("Invalid mode. Use 'encrypt' or 'decrypt'.")
end