What in the movie Da Vinci what was code being cracked by Professor Robert Langdon?

In the movie "The Da Vinci Code," Professor Robert Langdon isn't cracking a code in the traditional sense. He's deciphering a series of symbols, riddles, and clues left behind by the Priory of Sion, a secret society that protects the bloodline of Jesus Christ and Mary Magdalene.

Here's a breakdown of the key "codes" Langdon unravels:

* The Mona Lisa's smile: Langdon uses the Fibonacci sequence and the golden ratio to decipher a message hidden in Da Vinci's masterpiece.

* The cryptic message on the victim: The victim's body bears symbols associated with the Priory, which Langdon identifies through his knowledge of art and history.

* The Louvre museum's architecture: The layout of the museum itself, with its hidden passages and symbolic art, plays a crucial role in guiding Langdon to the next clue.

* The cryptex: This ancient device holds the key to unlocking a hidden vault and a crucial piece of information about the Priory's secrets.

While these "codes" aren't traditional cryptographic puzzles, they involve a combination of historical knowledge, artistic understanding, and logical deduction.