A Cryptex is a portable vault designed to conceal secret messages, popularized by Dan Brown’s novel The Da Vinci Code. This cylindrical device features a series of rotating lettered disks that must be aligned to the correct combination to unlock the internal compartment. Typically, a Cryptex includes five disks with 26 letters each, providing 11,881,376 possible combinations. To access the hidden chamber, users must align the disks to spell the correct five-letter password. The default password is often "I LOVE U," but it can be changed by following the manufacturer’s instructions. Inside, there's room to store small valuables like jewelry, keys, or secret notes. The Cryptex serves as both a security device and a fascinating puzzle, making it a popular gift for puzzle lovers and fans of The Da Vinci Code. Its combination of cryptography and physical security offers a tactile experience of code-breaking and secrecy.