Cipher tells the true stories of espionage and codebreaking — the trade of secrets, and the mathematics of keeping them. Each episode, host Nirob takes one operation, one machine, or one traitor — a telegram that dragged America into a world war, a body washed ashore in Spain carrying deliberately false plans, a machine with rotors that its owners believed unbreakable and a hut full of people who broke it anyway, a man at the top of British intelligence who had been working for Moscow the whole time — and rebuilds it: the stakes, the tradecraft, the tiny slip that gave it away, and what it cost.

From a queen's letters read by her enemies to the public-key mathematics protecting every message you send today, from a corpse with a briefcase to a bug with no batteries hidden in a gift from Moscow, Cipher is the history of the twentieth century told sideways — through decrypts, dead drops, and the people who lived double lives. Meticulously researched, honest about what remains classified, and always clear about the difference between the record and the legend. Clean and suitable for all ages. A new secret every week