Upload File Security on the Server Using LSB and Hill Cipher

Abstract

The rapid development of technology not only has a positive impact, but also can have a negative impact such as the development of cyber crime that can cause messages to be unsafe. Message security can be protected using cryptography to convert messages into secret passwords. Steganography is a technique of hiding messages by inserting messages into images that are used to increase message security. In this study, it discusses a combination of hill cipher and LSB algorithms to secure messages. The message used is a 3-bit grayscale image for steganography and text messages with 32, 64 and 128 characters for cryptography. The measuring instruments used in this study are MSE, PSNR, Entropy and travel time (CPU time). Test results prove an increase in security without too damaging the image. This is evidenced by the results of the MSE trial which has a value far below the value 1, the PSNR is> 65 dB with a range of entropy values of 5 to 7, and travel times are almost the same.

Enhancing steganographic text extraction: evaluating the impact of NLP models on accuracy and semantic coherence

“…Among various steganography methods, the Least Significant Bit (LSB) algorithm has become a hot research topic due to its simplicity and efficiency [5][6]. This method embeds secret information by modifying the least significant bit of image pixels, usually causing minimal visual impact on the image [7]. However, when steganographic images undergo common image processing such as compression, scaling, and noise addition, the embedded information often gets damaged, affecting the integrity and readability of the information [8].…”

“…Despite the excellent performance of LSB steganography in hiding information, it has evident shortcomings in the robustness of information extraction [9]. This issue becomes particularly pronounced when dealing with Chinese characters, whose complex encoding can make it difficult for traditional error recovery techniques to accurately reconstruct the original information once it is damaged [10].…”

Message Hiding Using the Least Significant Bit Method with Shifting Hill Cipher Security

“…Symmetric cryptography techniques are faster at running algorithms than asymmetric cryptography [2,7]. This is because symmetric cryptography uses permutations and substitution calculations [7,8]. One form of symmetric cryptography is Hill Cipher.…”

“…Hill ciphers have a matrix key [1,2], and are used to encrypt messages by multiplying the value of a character by that key. Hill Cipher is a very simple and fast method of processing [8][9][10].…”