A review paper: Text-to-image cryptography in color coding

Encryption techniques are important on the Internet. The challenges of color-coding are still hot topics. Many papers were published to develop encryption algorithms to prevent security attacks. Cryptography is the process of converting plaintext into ciphertext. It is classified into two types: symmetric encryption, which uses the same key for encryption and decryption processes; and asymmetric encryption, which uses private and public keys. Text to image color coding needs to encrypt text data into colors. Researchers proposed different techniques to implement this approach to safeguard text data against attacks. This work compares various types of text to image encryption and decryption techniques based on the RGB and CMYK color values and provides a comparison between them using various parameters such as application, program language, type of image, number of keys used, image dimension used, encryption and decryption processing time, advantage and disadvantage, image size used, evaluation measures, and so on.