暗号

1. Origins, structure, and basic meaning

• Structure: The information noun 暗号 (あんごう) denotes a cipher or code that conceals a message from outsiders.
• Basic usage: People can communicate 暗号で, while deciphering a written code is expressed with 暗号を解く.

2. Common pitfalls and similar expressions

• A code that conceals information
  • It is not limited to one password and can denote a system or result that makes information unreadable without decoding.