Abstract
The security and confidentiality of data is very important considering the rapid development of technology at this time which allows the emergence of new techniques that are misused by certain parties that can threaten security from data that are considered insignificant.
 Cryptography is a field of science to maintain image security. Cryptography has been implemented in many ways. The way it works is to change the original data that can be understood / read by humans (plaintext) to other forms that cannot be understood / read by humans (ciphertext). The process of transforming plaintext into chiperteks is termed encryption. While the process of returning a chipertext message to plaintext is termed decryption.
 Vigenere Cipher is an asymmetric cryptographic algorithm, where the key used to encrypt is different from the one used to decrypt. Vigenere Cipher is a cryptographic algorithm that uses letters and numeric values. Vigenere Cipher requires three steps in the process, namely key generation, encryption, and decryption. The process of encryption and decryption is almost the same process.
Highlights
important considering the rapid development of technology at this time which allows the emergence
of new techniques that are misused by certain parties
considered insignificant. Cryptography is a field of science to maintain image security
Summary
Kriptografi adalah ilmu yang berguna untuk mengacak data sedemikian rupa, sehingga tidak bisa dibaca oleh pihak ketiga. Tentu saja data yang diacak harus bisa dikembalikan kebentuk semula oleh pihak yang berwenang. Kriptografi berasal dari bahasa Yunani, crypto dan graphia. Crypto berarti secret (rahasia) dan Graphia berarti tulisan. Kriptografi adalah ilmu dan seni untuk menjaga keamanan data ketika data dikirim dari suatu tempat ke tempat yang lain [2]. Algoritma kriptografi merupakan langkah-langkah logis bagaimana menyembunyikan data dari orang-orang yang tidak berhak atas data [5]. Adapun fungsi algoritma kriptografi adalah sebagai berikut :
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