Lua维吉尼亚：关键词位移的多表加密

local function vig(s, key)
    local out, j = {}, 0
    for i = 1, #s do
        local b = s:byte(i)
        if b >= 97 and b <= 122 then
            local shift = key:byte(j % #key + 1) - 97
            b = (b - 97 + shift) % 26 + 97
            j = j + 1
        end
        out[#out + 1] = string.char(b)
    end
    return table.concat(out)
end

local function unvig(s, key)
    local out, j = {}, 0
    for i = 1, #s do
        local b = s:byte(i)
        if b >= 97 and b <= 122 then
            local shift = key:byte(j % #key + 1) - 97
            b = (b - 97 - shift) % 26 + 97
            j = j + 1
        end
        out[#out + 1] = string.char(b)
    end
    return table.concat(out)
end
local p = getplayerbyname("vig01")
sendmsg(p, 1, unvig(vig("attackatdawn", "lemon"), "lemon"))