The Network - Jason Elliot [33]
Strictly speaking, a message written in invisible ink across an ordinary letter is an example of steganography: the visible or cover message is innocuous. It’s an ancient idea. Herodotus describes a king who tattooed a secret message on the shaven head of his slave, whose hair was allowed to grow before he travelled through enemy territory to deliver it. More recent applications allow secret text to be hidden in the data of digitised photographs sent over the Internet. The advantage of a steganographic message is that, unlike a coded message, the secret part doesn’t attract attention to itself. It resembles something ordinary, and hides itself thereby.
My ex-wife, come to think of it, has a steganographic personality: an innocent-looking face concealing a cruel agenda.
I decide it has to be the numbers: thirteen and forty. ‘Degrees’ in the cover message also seems to be an overt clue. I find an atlas and look up the latitude and longitude. Problem. Thirteen degrees north and forty degrees east puts me in the mountains of northern Ethiopia. Forty degrees west is equally challenging – somewhere in the mid-Atlantic trench. Southern readings for the latitude land me in thick rainforest in Mozambique and Brazil. The numbers are not an obvious location.
They’re too short to be a phone number or a postcode. The only other reference I can imagine they might give is a book code, indicating a page and line number in a book known to both sender and recipient. But I haven’t agreed on a book with anyone called Mohammed.
Then it hits me like a delayed reaction, as I hear the echo of my very own words: I also read the Qur’an. The ‘old friend’, Mohammed, is the clue. It’s so obvious I can’t believe it’s taken me so long to realise. Now I regret my uncivil behaviour towards my visitor.
For centuries the mas-haf code, virtually unknown in the West, has been used in the Islamic world to encrypt messages using the numbers of the Qur’an’s sacred verses. Being identical in every version of the text, irrespective of country or date of publication, the verses retain the same numbers and provide thereby an unchanging key.
I go to my bookshelf, pull out an English translation and race to the thirteenth chapter, called Thunder. The fortieth verse, or aya, is a short one: ‘Whether We let you glimpse in some measure the scourge with which We threaten them, or cause you to die before we smite them, your mission is only to give warning: it is for Us to do the reckoning.’
There’s no need to look for any more clues. The reference to a warning is confirmation enough of the message. The question now is how to interpret it and, if necessary, respond. It’s strange news to get and I’m annoyed with myself for being hungover and slow. I regret my mind isn’t feeling sharper and that the whole significance of the message isn’t coming to me more quickly. The only thing I know for sure about the message is that it’s been sent by someone who knows enough of my background to be confident that I’ll figure out how to decipher it, and then how to interpret it. Whoever sent it also knows how to find me.
There’s a another sudden knock at the door, which has an effect similar to a powerful electric shock. I yank open the door with a scowl. There’s a different man standing on the doorstep, this time wearing a fake Barbour, jeans and trainers.
‘I’ve told your friend I’m a Muslim,’ I say gruffly.
The man’s eyebrows go up and down and he let outs