China Boat

Chapter 10

Wednesday, April 14, 1937
S.S. President Hoover
at sea

Dear Jack:

Well, old man, it's Wednesday night, my time — Thursday morning, your time, as I write this — and we're finally getting somewhere, on this voyage of ours. Tomorrow morning we put in to Honolulu, our first stop on the way to Shanghai.

It seems as if this voyage has already lasted forever. You know why.

I looked down at the last two lines, and grimaced to myself. It was perfectly true; but I didn't need to dwell on it, or to depress Jack by pointing it out.

I pulled out another sheet of paper — ship's letterhead, with 'Dollar Line', and 'S.S. President Hoover' emblazoned across the top; I'd decided to hang the expense of airmail rates, just for now — and I started over, omitting the last paragraph.

 … Tomorrow morning, we put in to Honolulu, our first stop on the way to Shanghai.

And that means, I'll finally get to mail you these letters I've been writing! And, we'll get to see if and how well Airmail really works, from overseas; I'm putting my letters to you in two different envelopes, just to keep them in manageable sizes; and also, to keep from putting all of my eggs in one basket, so to speak.

I suppose it's silly to worry about such things; and they'll all go on the same plane, anyway; it just seems like a long way to fly, over empty ocean, and then mountains and deserts. (And I can already feel you laughing at me, for my ground-hugger's ignorance of the reliability of modern aviation! All right, all right, I give in.)

Speaking of modern aviation — and that's a hint, by the way — yes, I'm sending you photos, after all! As you can see. The ship's lab came through for us, wonderfully. I'm actually sending you the best of the lot; although I'm ashamed to admit that they are the best. I'll just have to keep practicing, and trying harder.

I've written down dates and places and little comments, on the backs of the prints; just in case you're interested. Most are of San Francisco, and they go with my letters from there. But I've also included some shots of our boat, and my stateroom, and the decks and public spaces I've already described, in my later letters.

I deeply, deeply wish you were along for the trip, old man; I'm sorry we couldn't pull it off. But sharing these pictures of San Francisco and the boat with you, is a consolation; it means a very great deal, to me. And just knowing that you'll be seeing them, in just a few days — Well. It feels like a miracle. The best kind of miracle.

I had to stop and blink, a few times, at that.

It did feel like a miracle; and there was so, so much more I wanted to say to him, and couldn't … 

I shook my head, and made myself go on.

As it turns out, we're not stopping in Honolulu for very long; we get in, in the mid-morning, and we sail again around sunset; we're just dropping off, and picking up, passengers, and some more cargo. Still, it's a few hours, so my young shipmate Tom and I will be exploring, as best we can. (The old Hawaii hands have warned us not to expect too much; apparently, there isn't much tropical paradise to be found downtown. It's reserved for Waikiki, they say, and nice hotels like the Ala Moana and the Royal Hawaiian. Well, we'll see; and so will you, when you get the photos.)

In any case, we'll be on a mission. The President Hoover has a very nice-looking swimming pool; and Yours Truly needs a bathing-suit. (Don't laugh!) My own is packed away deep in the hold, and the only ones in the ship's onboard store are about three sizes too big … the same old story, for the both of us, I know. I suppose I could cinch a pair around my waist, with string or safety pins, or something, and wear them like pantaloons; I think, in the water, I'd look as though I were being eaten alive, by a jellyfish.

Neckties and bathing-suits; two of mankind's most useless and uncomfortable inventions. Bah.

I lifted up my head, and looked around for a moment, to rest my eyes; and to think.

I was writing in the First Class Smoking Lounge; primarily because I didn't want to be in my cabin, and Father was in the Library, reading quietly … It is easier to write Jack, I've found, when not in the same room as Father.

This letter, in particular. For a very good reason.

It was a pleasant enough place, in any case, and not much smokier than most of the other spaces in the ship. The floor was all of green-rubber tile, and there were green-glass smoking stands littered around; I was seated in a nice, overstuffed armchair that Jack would have approved of, using my school atlas, propped up on my lap, as a portable desk. At this hour, most of the smoking was of post-dinner cigars, whose odor was tolerable enough. In small doses.

I went on.

Actually, a new bathing-suit for me, isn't our only mission; we'll also be shopping for Tom. Do you remember, I persuaded him to come running with me, on the top deck?

Well; as it turns out, it's more like I'm teaching him about running; starting with how to stretch. At his school, they just send the students off to run without stretching, without preparation of any kind; and no stretching afterwards, either, it's just start-and-stop. Can you imagine?

Anyway; his shoes are woefully inappropriate for the task, they're great, hulking clod-hopper things; so of course, he's developed blisters on the backs of his heels So, we ran barefoot, yesterday; which made me footsore, along with him.

The upshot is, he's persuaded his parents to let him buy some decent running-shoes; if we can find any. I hope we can; I don't relish running barefoot all the way across the Pacific; teak decks are not the same as grassy fields.

I paused for another moment, considering what to say, about Tom. What I could say, versus what I wanted to say.

It's actually an interesting friendship we've developed, he and I; and in so many ways and at any number of moments, I've wished you were here to share it, old man.

And especially, I've wished you were here to, well, advise me. Or better yet, to take the lead, the way you always have done, with the needier third-formers. I know, we're a team, and we work best as a team, I'll admit it; but you always know, better than I, what to say, what to do, straight off.

Of course, I was thinking about what I'd started teaching Tom during our shower-times, after running … and about his reactions to that education. His reactions, to me.

I so longed to talk it over, with Jack.

I would, someday, certainly; when I could. But I needed him, now.

I sighed, and bent back down over the letter in my lap.

Well, in the meantime, I'm doing the best I can.

In any event — Tom and I are becoming good friends, as I've said. And within that friendship, there is just a touch of — protectiveness, on my part — ?

He is very young, and not terribly knowledgable; or perhaps not very worldly, would be a better way to phrase it; he is actually very, very smart, and very quick-witted. But he is not worldly, and he is going to live in a strange country, just as I did, once. Or twice, if you count my return to America; which I do.

As ridiculous as it sounds, I feel a little bit like an older brother, towards him. I will try to act the part, anyway; and not let him down … 

______

On a more mundane front — I've actually encoded my first business cable, for Father; and I have to tell you, J., it's a fascinating process.

Actually, I only did half of the encoding process; Father did the first step, behind looked doors — (!) — and he's told me nothing about his side of the process. In fact, he burned his plain-text document, in the ashtray in his cabin, before giving the results to me; those results were jumbled code-groups, and it was my task to encode them further. Or so I assume.

Father has surprised me, several times, on this trip. He has always been the soul of discretion, of course; he is a banker, after all. But I had never quite understood how much he keeps back, from me … it is somewhat worrying.

Jack would understand the cause for my worry right off. Of course. It is a cause we share.

Anyway, old man; it is my part of the encoding process that I find so fascinating.

I am to use a cypher, called a Vigenère cypher, to further-encode Father's messages; and it is a cypher-method that is easy to use, for both the originator and the recipient; and it is 'almost' unbreakable.

'Almost' is, of course, the key word, here. According to Father's textbook, which describes the cypher-method, it can be broken by trial-and-error; if one has a very great deal of time, or a very great many people trying to break it, or both. And apparently, it can also be broken by sophisticated mathematical analysis; again, if one has a long enough message, and access to several skilled mathematicians, and, again, time. Father says that many governments, and even some businesses, have such resources, and routinely try to decode at least some important radiograms and cables; it is why he's using a two-step encoding process.

But failing such resources, it apparently is a virtually unbreakable cypher.

I was thinking, Jack — maybe we could try exchanging some cypher-messages, by mail, just as a lark — ? Perhaps you could even find a way to turn it into a school project, for extra credit? I think it might be wonderful fun!

I was almost indecently proud of myself, for coming up with the idea. Jack would call it, me at my devious best; I was sure of it.

We wouldn't be exchanging encoded messages for fun, of course; we'd be doing it, for the sake of communicating candidly — and, just maybe, in the final catastrophe, to arrange a place to meet, should I need to run away from Father, run away from Shanghai.

But the casual, third-party reader of this letter wouldn't know that.

So, I'd established a reason to be sending cypher-messages — multiple cypher-messages — to Jack, by mail. Many of them, most of them, even, would likely be innocuous; as innocent as an ordinary, unencrypted letter — 

Others need not be.

Steganography, I thought; the art of concealing the existence of a hidden message. I knew Jack would pick up on the implications, at once; I wished I could see his face, when he read these lines … 

This method would be infinitely superior to my pinprick-code.

Of course, we still needed a way to arrange private key-phrases; key-phrases were the hinge to the whole encryption process. But I was sure we could do that; we know each other extremely well.

But before then, of course, there was one more small matter; I needed to describe the Vigenère cypher-process to him. I bent back down, over my lap, and thought how to describe it … 

So, old man; here is how the Vigenère cypher works.

First, one needs to construct the Vigenère square, the tabula recta. It's tedious; but one only need do it once, the same square can be used for all subsequent messages.

Start by printing out the letters of the alphabet, A through Z, near the top of a sheet of paper. (I suggest printing large, from experience; larger letters are easier on the eyes.)

Underneath that first row, print out the letters of the alphabet again; but this time, start with the letter 'B', and end with the letter 'A'.

Underneath that, print out another row; but this time, start with the letter 'C', and end the line with 'A' and 'B', following the 'Z' … 

You get the idea.

In the end, you'll have a square, with twenty-six rows, and twenty-six columns. The first row will read A through Z, left to right; the leftmost column will read A through Z, top to bottom.

The top row with be used with the key; the leftmost column will be for the plain text.

Here is how the key, and plain text, work.

First, on a separate sheet — a throwaway sheet; Father insisted I burn my working-page, after I encoded his message — write down the secret message, in plain text:

I considered what to use, as an example. 'Rhys Williamson loves Jack Van Doern' came to mind immediately; and of course, the idea was absurd. But, I thought, once we had our cypher-stream in production … 

The thought was ridiculously scary, and ridiculously exciting. I pushed it aside. Instead, I printed out — 

 

MESSAGE FROM THE PRESIDENT HOOVER

Next, one takes up the key; the key must be known to the sender and the recipient, (and no-one else!) Let's say, it's the first fragment of Lincoln's Gettysburg Address:

FOUR SCORE AND SEVEN YEARS AGO

One prints the key, above the plain-text message:

FOURSCO REAN DSE VENYEARSA GOFOUR
MESSAGE FROM THE PRESIDENT HOOVER

As you can see, the key can be of any length. If it is shorter than the plain-text message, just start repeating it. One doesn't worry about punctuation or spaces; the final product will be grouped in five-letter bits, anyway, for ease of handling, and as an additional disguise.

Now comes the fun part.

Consult the tabula recta; go to the 'F' column, (the column underneath the 'F', in the first row); then, read down to the 'M' row, (the row which has the 'M' in the leftmost column); and find the character in which the row and column meet. In this case, it's the letter 'R'.

This is the first letter of the encrypted message.

I had brought my own tabula recta with me, inside the school atlas I was using as a writing-desk; and I'd surreptitiously consulted it, to find the 'R'.

Now, I looked around me carefully, while trying not to be too obvious; no-one was at all close by, and no-one was paying me any attention. So, I brought out the tabula recta smoothly, set it down above my letter, and followed my own instructions, to encode the rest of my test message.

Follow the same process for each letter in turn; and you'll come up with this, as the encrypted text:

FOURSCO REAN DSE VENYEARSA GOFOUR
MESSAGE FROM THE PRESIDENT HOOVER
RSMJSIS WVOZ WZI KVRQMDVFT NCTJYI

Now, write out the encrypted text in five-letter groups:

RSMJS ISWVO ZWZIK VRQMD VFTNC TYJI

Stand back, a moment, and look at it.

Rather impressive, don't you think, old man?

The decryption process is straightforward. One writes the key phrase in, above the encrypted text; one uses the top row of the Vigenère square, for the letters in the key; one looks down in each column, to find the letter in the encrypted text; and then, one looks to the leftmost column, this time, to find the corresponding, correct plain-text letter. It is just the reverse of the encryption process.

Two rather elderly men, one bearded, one not, stood up at the other end of the smoking-room, and began heading towards the door; walking carefully, against the easy roll of the ship. I slid the tabula recta back inside my school atlas, and covered my letter; and waited patiently for them to pass by, before uncovering my letter, and going on.

There are drawbacks, of course.

I'll be the first to admit, J., that the process is tedious; encoding Father's message took me almost an hour, and it wasn't a long one. Too, Father insisted I double-check my work, and I did find an error; which was humbling. And then, he double-checked it all himself, which was not flattering.

And as I'd told Jack, Father had also insisted on burning my working-paper, as soon as I'd finished the checking process; which I'd found … disturbing.

In any case, I found that using a ruler — or two — helps. In fact, tomorrow I'm going to draw in ruled lines, for the columns and rows of my tabula recta. That should help, a great deal more.

Still. The tedium is a small price to pay, for the privilege of privacy, don't you think, old man? Think how much fun it will be, sending 'secret' messages to one another!

______

And that, Jack, is about all the fun I can contemplate having, tonight. It's getting late.

I am very much looking forward to tomorrow; and not just for the sake of stretching my legs in Honolulu. Actually mailing these letters to you will be a profoundly satisfying experience. And if airmail-delivery has worked out, and I am lucky enough to have a line or two from you waiting for me, I will be very happy, indeed.

I blinked, twice, three times, as I wrote this. The degree to which I was anticipating his letters was almost indecent. To actually get words, from him, written by him … The prospect had colored and dominated my whole day.

I also hope, very much, that all is well with you, your family, and our friends.

Take care of yourself, old man, all right? And, watch out for reports and photos from Your Man In Hawaii, coming soon! (Well, in a few more days, or weeks, really, anyway … a disturbing thought. I wish like anything that there was a post-office in the middle of the Pacific, closer than Yokohama. But you'll get the reports, and the photos, I promise!)

Take care, Jack.

Yours, always — 

Rhys

M.O.C.

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