Abstract
Message security in communication is very important to maintain the confidentiality and integrity of messages. The message that is sent must be conveyed in its entirety and only delivered according to its purpose. One Time Pad or OTP is an algorithm that can encrypt messages into ciphertext so that message security can be guaranteed. OTP is a symmetric cryptographic algorithm, that is, the key for encryption and decryption is the same. To perform encryption, the OTP plaintext length must be the same as the key length. This will make it difficult when there is a very long length of plaintext, so the key must also adjust it. OTP keys also have a weakness if a key has been used more than once. Therefore a key builder is needed. In this research, the key generator used is base64. Base64 is used to change the bits of plaintext that will be used by OTP. In this study, base64 can encode plaintext to be used as an OTP key so that it succeeded in making the key generator from base64 encoding.
Highlights
Message security in communication is very important to maintain the confidentiality and integrity of messages
Base64 is used to change the bits of plaintext that will be used by One Time Pad (OTP)
Base64 can encode plaintext to be used as an OTP key so that it succeeded in making the key generator from base64 encoding
Summary
Abstrak— Keamanan pesan dalam komunikasi menjadi hal yang sangat penting untuk menjaga kerahasiaan dan keutuhan pesan. [5] pada artinya yang berjudul “Base, End of File and One Time Pad for Improvement Steganography Securit” membahas peningkatan teknik steganography dengan menggunakan base dan OTP, pada penelitian ini kunci yang digunakan dibuat tersendiri. Pada penelitian ini base akan digunakan sebagai kunci yang ada pada OTP untuk memberikan kunci otomatis dan meningkatkan kunci keamanan pada OTP pada saat enkripsi pesan. Metode yang digunakan pada penelitian ini menggunakan algoritma One Time Pad (OTP) dan Base 64. C = (p + k) mod n p = (c – k) mod n dimana: p = plaintext c = ciphertext k = key n = number of letters used Pada penelitian ini akan digunakan karakter yang berjumlah 26 yang diambil dari tabel ASCII. Tabel I memperlihatkan karakter yang digunakan pada penelitian ini berjumlah 26 karakter, sehingga modulo yang digunakan untuk enkripsi dari OTP adalah modulo 26
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