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<v Speaker 1>Going back to ancient times, we go as we're going

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<v Speaker 1>to learn about the skittily scy Tha l e before

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<v Speaker 1>we get started, making sure to share and subscribe. Today

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<v Speaker 1>we're looking at before algorithms, before the binary code, before

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<v Speaker 1>anything we recognize.

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<v Speaker 2>As a computer.

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<v Speaker 1>The Spartan's built a military encryption system so elegant that

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<v Speaker 1>survives centuries of warfare. Today we're going to explore the

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<v Speaker 1>Siteles or Skittily, a wooden baton that turned a strip

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<v Speaker 1>of leather into the ancient world's most guardly secret, most

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<v Speaker 1>closely guarded secret. We go inside the Peloponnesian War to

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<v Speaker 1>understand what it meant to trust a piece of wood

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<v Speaker 1>with your army's survival. So I imagine you're a Spartan general.

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<v Speaker 1>You're deep in enemy territory. Athenian scouts have been spotted

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<v Speaker 1>on the ridge line, your supply lines are thinning, and

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<v Speaker 1>your next move depends entirely on a message you've just

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<v Speaker 1>received from Sparta. They run oer hands you a narrow

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<v Speaker 1>strip of leather.

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<v Speaker 2>You look at it.

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<v Speaker 1>It's gibberish, just letters, random, meaningless, scattered across the hide,

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<v Speaker 1>like someone drop the alphabet and never bothered to clean

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<v Speaker 1>it up.

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<v Speaker 2>You pull a wooden baton from.

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<v Speaker 1>Your belt, You wrap the leather strap around it in

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<v Speaker 1>a tight spiral, and then word by word, line by line,

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<v Speaker 1>a sentence emerges between the gaps. Return im mediately Athens

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<v Speaker 1>moves north. You've just witnessed the world's first documented transposition

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<v Speaker 1>cipher and the device in your hand that's the skidily.

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<v Speaker 1>And for a few critical centuries in ancient Greece, it

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<v Speaker 1>was the difference between military victory and catastrophic, blood soaked failure.

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<v Speaker 1>We're talking about the fifth century BC.

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<v Speaker 2>Here. Greece is not a unified nation.

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<v Speaker 1>It's a patchwork of city states, each with its own culture,

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<v Speaker 1>military and political identity. Two of the most powerful are

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<v Speaker 1>Athens in Sparta, and they've been locked in a cold

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<v Speaker 1>war that's about to go.

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<v Speaker 2>Very very hot.

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<v Speaker 1>The Peloponnesian War runs from four thirty one to four

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<v Speaker 1>h four BC, and it is the fining conflict of

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<v Speaker 1>the ancient Greek world. Athens has the navy, Sparta has

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<v Speaker 1>the army. Athens has philosophers and playwrights. Sparta has the

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<v Speaker 1>most discipline's psychologically hardened soldiers in recorded history, men who

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<v Speaker 1>are taken from their families at age seven and forged

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<v Speaker 1>into something closer to.

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<v Speaker 2>Weapons than humans.

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<v Speaker 1>And Sparta also has something else, something quieter, something that

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<v Speaker 1>almost nobody talks about when they talk about ancient warfare.

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<v Speaker 1>They have operational security. Here's how the skiddy worked. And

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<v Speaker 1>I wanted to tell you. I want you to really

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<v Speaker 1>sit with the elegance of this, because it's stunning in

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<v Speaker 1>its simplicity. The Spartan Military Commission a set of wooden

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<v Speaker 1>batons cylindrical staffs, all cut to a very specific standardized diameter.

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<v Speaker 1>One stays in Sparta, in the hands of the yepfors

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<v Speaker 1>the governing Council. Another travels with the commanding General in

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<v Speaker 1>the field, same diameter, same device. When Sparta needs to

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<v Speaker 1>send a message, ascribe takes a long, thin strip of

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<v Speaker 1>leather or parchment and winds it tightly around the baton

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<v Speaker 1>in a diagonal spiral, edge to edge. Then they write

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<v Speaker 1>the message lengthwise across the surface of the wrap leather,

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<v Speaker 1>one letter per section, tracking down the baton like a

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<v Speaker 1>column of text. Then they unwrapped the strip. What you're

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<v Speaker 1>left with looks like pure noise, letters scattered across a

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<v Speaker 1>long ribbon with no apparent logic. No word breaks, no

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<v Speaker 1>identifiable sequence to anyone who intercepts it.

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<v Speaker 2>It's meaningless.

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<v Speaker 1>You could read it forwards, backwards, and columns and rows

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<v Speaker 1>and get nothing. But the moment you wrap that strip

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<v Speaker 1>around a baton of the same exact diameter, the spiral realigns,

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<v Speaker 1>the columns of letters stack, the message surfaces like a

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<v Speaker 1>photograph developing in a dark room. This is transposition cryptography,

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<v Speaker 1>not substitution, where you wrap one letter for another, but transposition,

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<v Speaker 1>where you physically.

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<v Speaker 2>Scramble the order of the letters.

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<v Speaker 1>The information is all there, it's just geometrically hidden, and

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<v Speaker 1>in four hundred BC, that was enough to change the

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<v Speaker 1>outcome of wars. Here's where it gets interesting, and this

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<v Speaker 1>is the part that doesn't usually show up in the

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<v Speaker 1>history textbooks. Imagine you're a spartan field commander. You received

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<v Speaker 1>a message. You're runner made it through barely. You know

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<v Speaker 1>Athens has agents on the roads. You know there are

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<v Speaker 1>mercenaries who sell information whoever pays.

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<v Speaker 2>You know that the.

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<v Speaker 1>Leather strip your runner carried pass through dozens of miles

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<v Speaker 1>of hostile territory. And here's a question that would have

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<v Speaker 1>kept any rational commander awake at night. What if someone

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<v Speaker 1>found a baton close enough in diameter to read it.

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<v Speaker 1>This isn't paranoia, this is threat modeling. The sctile's entire

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<v Speaker 1>security rested on one physical variable, the diameter of the staff.

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<v Speaker 1>If an adversary could capture enough ENCRYPTID messages, could they

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<v Speaker 1>reverse engineer the baton size through trial and error? Could

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<v Speaker 1>they whittle a series of staffs of slightly varying wits

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<v Speaker 1>until one made the message court Here we don't have

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<v Speaker 1>clear historical evidence that the Athenians ever cracked Scaily this way,

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<v Speaker 1>but the possibility was structurally real, and any commander who

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<v Speaker 1>understood the system knew it. This is one of the

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<v Speaker 1>earliest documented examples of what intelligence professionals today called cryptographics anxiety,

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<v Speaker 1>the specific psychological burden of not knowing whether your communications

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<v Speaker 1>have been compromised.

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<v Speaker 2>You operate on the assumption.

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<v Speaker 1>Of security, but you could never be certain, and in warfare,

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<v Speaker 1>that uncertainty is its own kind of wound. Plutarch, writing

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<v Speaker 1>centuries later, gives us some of our best documentation on

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<v Speaker 1>the scittiy. He references it in his account of the

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<v Speaker 1>Spartan general Lysander receiving a critical message, a warning about

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<v Speaker 1>a conspiracy involving the Persian satrap far anabasis, wrapped in

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<v Speaker 1>a belt delivered by a messenger. The message, once decode,

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<v Speaker 1>it likely shaped one of the pivotal political maneuvers of

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<v Speaker 1>the late Pilidiphnesian War. That's not a footnote, that's cryptography

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<v Speaker 1>altering the arc of ancient geopololitics. What's remarkable is that

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<v Speaker 1>the skittley wasn't just a clever trick.

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<v Speaker 2>It was institutionalized.

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<v Speaker 1>It was baked into Spartan military protocol at the state level.

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<v Speaker 1>The eepers held one baton, the general held another.

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<v Speaker 2>This was infrastructure, this was policy. This is what we

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<v Speaker 2>now call a.

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<v Speaker 1>Cryptographic key management system. Standardized, distributed, operationally integrated. SPARTA was,

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<v Speaker 1>in a very real sense, the world's first crypto state.

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<v Speaker 1>Time you send an encrypted message, every time your phone

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<v Speaker 1>scrambles a text into your ciphertext before it leaves your hand,

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<v Speaker 1>you're participating in a tradition that began on a hillside

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<v Speaker 1>and Laconia with a wooden baton and a strip of leather.

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<v Speaker 1>The tools have changed, yes, quantum computing is already threatening

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<v Speaker 1>the encryption standards we rely on today, But the core problem,

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<v Speaker 1>how do you send a secret across hostile territory without

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<v Speaker 1>it being read. Is exactly what a Spartan scribe was solving.

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<v Speaker 1>Twenty five hundred years ago, the skiddily did an ingest

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<v Speaker 1>encrypt messages to encrypted trust had said, only someone who

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<v Speaker 1>already has what you have can understand what you're telling them.

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<v Speaker 1>In warfare and diplomacy and intelligence, that's still the whole

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<v Speaker 1>game