The BLACK Crisis

This thread traces the mounting pressure of BLACK, from its baffling contradictions to the conference, stolen notebook, and discovery of its zero key.

increasingBearing stren­gth in each eventdecreasing

A Darker Cipher Appears

A Darker Cipher Appears A new threat BLACK appears as a system more sophisticated than PURPLE, and Rong Jinzhen senses from the outset that confronting it may destroy him. The challenge gradually dominates his working life. Confidence becomes pressure Colleagues trust the celebrated codebreaker to solve what has stopped everyone else. That trust is also a burden: the man who once chose a forbidden path now bears an assignment imposed by his reputation and the needs of his unit.

Years Without an Opening

Years Without an Opening A search for errors Rong Jinzhen examines BLACK for the small flaws that could expose its structure, but the cipher yields no useful opening. His method and intuition, so effective against PURPLE, meet a system that appears almost impossibly controlled. Pressure narrows his world The prolonged failure intensifies his isolation and exhaustion. Unlike the earlier breakthrough, BLACK no longer feels like a game; it becomes an increasingly personal struggle against a problem that seems to have no answer.

The BLACK Symposium

The BLACK Symposium Collective expertise Unit 701 and General Headquarters convene specialists to assess BLACK. Officials frame its decryption as essential to national security, while the professional presentations offer little that Rong Jinzhen finds substantial. Isolation amid acclaim He is treated as a celebrated expert, yet the meeting does not provide the insight he needs. The contrast between public confidence and his private bewilderment deepens his sense that the burden rests on him alone.

The Missing Notebook

The Missing Notebook A theft in transit A thief takes Rong Jinzhen’s leather briefcase while he travels home with Vasili. Inside is the blue notebook containing years of private reasoning about BLACK, a record he has failed to secure in the official safety box. A personal catastrophe The loss is more than a breach of procedure. Rong Jinzhen understands the notebook as the vessel of his inner work, and the possibility that it may be destroyed turns professional failure into a crisis of identity.

Zero and the Breakthrough

Zero and the Breakthrough An outsider reads the record Yan Shi studies the recovered notebook after Rong Jinzhen’s collapse. He sees that the notes contain an almost complete analysis, but cannot simply reproduce the final step by following the same path. The key is nothing Yan Shi realizes that BLACK’s apparent lock is a false façade: its key is zero. The discovery resolves the cipher’s contradictory simplicity and difficulty, while making the victory inseparable from Rong Jinzhen’s destruction.

1 September 1966

1966 to late 1969

late 1969, at General Headquarters

late 1969, on the return train

around three in the morning, during the crisis