Ciphers are living organisms

Ciphers are living organisms is Rong Jinzhen’s theory that cryptographic systems remain connected across time, even when their creators try to conceal their histories. It recasts the past not as a record to avoid but as a possible guide to present-day decryption: the lineage of ciphers may disclose patterns that ordinary trial and error cannot reach.

A Hidden Continuity

Rong Jinzhen argues that ciphers used in different historical periods are invisibly connected, and that systems created at the same time may share an especially intimate relationship. A clue to a cipher under examination may therefore lie in an earlier one. The claim unsettles the assumption that a new cipher can be understood only on its own terms; it treats cryptographic history as a body of related forms rather than a succession of sealed inventions.

The interviewer counters that cipher creators must remove every trace of a system’s history, since one historical clue might otherwise expose multiple messages. Rong Jinzhen does not deny the effort to erase those traces. Instead, he turns the argument around: the attempt to make ciphers look historically unrelated is itself a shared feature, and thus creates another connection between them. Concealment, in this account, cannot wholly cancel inheritance.

Evolution and the Two Paths

Rong Jinzhen compares changes in a cipher to changes in a face, but stresses that the analogy has limits. A face remains recognizably a face through its changes; a cipher can be made to resemble something entirely different, with no fixed outward parameters. Yet beneath that changing surface, its internal features are refined and advanced. The outward disguise and the continuing refinement form two paths through cryptographic history.

Finding both paths, he maintains, can aid decryption. The theory makes historical study a search for structure beneath disguise: surface transformation may obscure a cipher’s ancestry, but it does not necessarily eliminate the deeper processes shaping it. For Rong Jinzhen, the history of cryptography is therefore not a catalogue of old designs. It is a forest in which the routes of concealment and development can lead toward the design of a new cipher.

History as Resource and Hazard

This historical approach collides with the conventional method described by the narrator. In that method, intelligence agents gather relevant information, and cryptographers use it to devise hypotheses, effectively making many possible keys for many possible doors. The work can be slow and extensive, but the narrator calls it safe, secure, and effective, especially when the target is a high-level cipher. Rong Jinzhen instead enters the forbidden territory of earlier cryptographic work, hoping history will narrow the search. If there are ten thousand byroads, even eliminating half would substantially change the problem, though it would not guarantee success.

The narrator also presents history as a burden that has left cryptographers isolated. In the forest of the past, there is no one to ask for directions; the work is secretive enough that practitioners cannot simply build on the discoveries of those who came before. Rong Jinzhen’s method reaches across that isolation, but it also exposes him to the danger of following old traps. Its promise and risk are inseparable: history might reduce the field of possibilities, or lead the investigator into precisely the hazards earlier cryptographers devised.

The Theory Beside BLACK

The theory gains a practical resonance in the account of Rong Jinzhen’s long failure to decipher BLACK. The narrator describes ciphers as a seamless net that can still betray slips when used: a tiny leak may give a codebreaker an opening. After the cracking of the PURPLE cipher system, the adversary became more cautious, and Unit 701 considered whether Rong Jinzhen had found no errors in BLACK because its creators had been warned of his abilities. Liseiwicz, who understood Rong Jinzhen well, might have helped them develop countermeasures; their former closeness was now divided by political positions and beliefs.

The eventual breakthrough turns on a different kind of hidden connection. At three in the morning, the narrator used the calculator capable of more than 40,000 calculations that Headquarters had given Rong Jinzhen to test an assumption. The key to BLACK was in a leather attaché case: the cipher’s key was zero. What had seemed securely locked had no real lock. This discovery does not itself establish Rong Jinzhen’s theory of historical lineage, but it echoes its attention to the gap between a cipher’s apparent surface and what its structure conceals. The cipher’s seeming impenetrability proved to be a false façade, and the smallest possible key opened it.