View difference between Paste ID: 3HEaFDMQ and 1yKQLhCT

 rednet.open('right')
 local deCrypt = {} --do not change
 
 --change keys here
 local deCrypt1 = 'a'
 local deCrypt2 = 'b'
 --
 
 for num = 1,#deCrypt1 do
     local v = string.sub(deCrypt1,num,num)
     table.insert(deCrypt,string.byte(v))
 end
 
 while true do
     repeat
         id,msg,prot = rednet.receive()
     until type(msg) == 'table'
     for i,v in ipairs(msg) do
         if i ~= 1 then
             local num = v
             num = num/os.epoch()
             for i2,v2 in ipairs(deCrypt) do
                 if i2%2 == 0 then
                     num = num*v2
                 else
                     num = num/v2
                 end
             end
             msg[i] = num
         end
     end
     local result = ''
     for i,v in ipairs(msg) do
         if type(v) == 'number' then
         if v <= 255 and v >= 0 then
             result = result..string.char(v)
         end
         end
     end
     print(result)
     if result == deCrypt2 then
         print('accepted')
     end
 end