AbstrakKeamanan merupakan salah satu faktor penting dalam penyimpanan dan pengiriman data atau pesan. Salah satu cara untuk mengamankan dokumen adalah dengan menggunakan algoritma kriptografi. Kriptografi berdasarkan jenis kuncinya dibedakan menjadi dua yaitu kriptografi simetris dan asimetris. Algoritma enkripsi asimetris termasuk Rivest-Shamir-Adleman (RSA), Diffie-Hellman, Digital Secure Algorithm (DSA), XTR, Elliptic Curve Cryptography (ECC), dan Elgamal Encryption System (ESS). Dalam makalah ini akan melakukan survei paper terkait algoritma-algoritma enkripsi asimetris. Implementasi kriptografi asimetris dapat dikembangkan menggunakan algoritma-algoritma tersebut.

This paper contains a review of the spatial domain steganographic literature. The purpose of this paper is to provide knowledge about techniques or methods that exist in the spatial domain of steganography. Steganography is the science or technique for hiding secret messages in other messages so that the existence of the secret message cannot be accessed by others who do not have authority. There are several popular spatial domains of steganographic techniques, namely LSB (Least Significant Bit), which is mapping secret message bits in the rightmost bit (LSB) of each color pixel and PVD (Pixel Value Differencing) which in this method offers a larger message storage capacity , with better image quality compared to other methods in the spatial domain. Because privacy issues continue to develop along with various digital communication technologies, and increasingly strong security threats, steganography can play a role in society to maintain the confidentiality of both picture, voice and video messages. For this reason it is important for us to be aware of steganographic technology and its implications.

<p class="Abstrak">Keamanan data dan informasi saat ini merupakan aspek penting dalam proses pertukaran pesan melalui jaringan internet. Tanpa adanya keamanan sering kali pesan tersebut dimanfaatkan oleh oknums yang tidak bertanggung jawab. Oleh karena itu, keamanan data dibutuhkan perlindungan informasi yang akan dikirimkan kepada penerima. Teknik keamanan data dan informasi yang saat ini banyak digunakan yaitu kriptografi dan steganografi. Kriptografi dan steganografi adalah teknik keamanan informasi yang memiliki persamaan dalam hal keamanan. Pada penelitian ini, teknik yang digunakan adalah algoritma Kriptografi Rivest Shamir Adleman (RSA) dan algoritma Steganografi Least Significant Bit<em> </em>(LSB) untuk keamanan pesan. Analisis yang dilakukan terhadap kombinasi algoritma dalam penelitian ini meliputi analisis pengaruh variabel citra pada proses enkripsi dan dekripsi. Pengujian kualitas citra menggunakan teknik Normalized Cross Correlation (NCC), Structured Similarity Index Method (SSIM), Peak Signal to Noise Ratio (PSNR), dan Mean Square Error (MSE). Berdasarkan hasil pengujian menggunakan skema kriptografi RSA dan skema steganografi LSB mampu direkonstruksi dengan baik. Pengujian MSE pada ukuran citra 128x128 menghasilkan <em>error</em> terbesar dan terkecil pada ukuran 1024x1024. Pengujian PSNR citra berukuran 64x64 dan 128x128 menghasilkan nilai kurang dari 40 dB. Sedangkan ukuran 512x512 dan 1024x1024 memiliki nilai lebih dari 40 dB. Pengujian NCC dan SSIM menghasilkan nilai yang mendekati 1 dengan semakin besarnya ukuran citra.</p><p class="Abstrak"><em><strong><br /></strong></em></p><p class="Abstrak"><em><strong>Abstract</strong></em></p><p class="Abstract"><em>Data and information security are currently an important aspect in the process of exchanging messages through the internet network. Without security, the message is often utilized by an irresponsible person. Therefore, data security is required to protect the information that will be sent to the recipient. Data security techniques and information that is currently widely used are cryptography and steganography. Cryptography is a technique for encoding data into encrypted data that is not understood, while steganography is a technique for hiding data into a medium that aims to protect messages from unauthorized. Cryptography and steganography have similarities in terms of security. In this study, the technique is Rivest Shamir Adleman (RSA) Cryptographic algorithm and the Least Significant Bit (LSB) Steganography algorithm for message security. The analysis of an algorithmic combination in this research includes analysis of variable influence image of the encryption and decryption process. Image quality testing uses the Normalized Cross Correlation (NCC), Structured Similarity Index Method (SSIM), Peak Signal to Noise Ratio (PSNR), dan Mean Square Error (MSE) techniques. Based on the testing using the scheme RSA cryptography and the scheme LSB steganography capable of reconstructed well. MSE testing on the size of the image of 128x128 produces the error biggest and the smallest on the size of 1024x1024. PSNR testing on the size of images 64x64 and 128x128 produces values under 40 dB. Meanwhile, the image sizes of 512x512 and 1024x1024 have values above 40 dB. Testing NCC and SSIM produce a value close to 1 with increasing size of the image.</em></p><p class="Abstrak"><em><strong><br /></strong></em></p>

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