Steganography is a technology and science about information hiding. The so-called information hiding refers to not letting anyone know the transmission event or content of information except the intended recipient.

Steganography is called Steganography in English, which comes from a book about cryptography and steganography written by Tritemius. The title of the book comes from Greek, meaning "steganography".

Steganographic information is usually encrypted by some traditional methods, and then a "disguised text" is modified in some way to include the encrypted message, forming a so-called "hidden text".

For example, you can modify the size, spacing, font or other characteristics of text to include hidden information. Only when the receiver knows the hiding technology used can he recover the information and then decrypt it.

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In recent years, steganography has become a research hotspot in the field of information security. Because every website depends on multimedia, such as audio, video and images. Steganography is a technology that can embed secret information into digital media without damaging the quality of the carrier.

The third party knows neither the existence of secret information nor the existence of secret information. Therefore, keys, digital signatures and private information can be transmitted safely in an open environment, such as the Internet or intranet. This paper mainly introduces the basic principle and various applications of steganography.