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In order to send data or information  processed by using cryptography people can use XML(eXtensible Markup Language). XML data are general texts file which consist of several different tagswhich are defined by the XML document maker. In this research, the XML data were processed by usingPassword Based Encryption cryptography. This method consists of encryption and decryption meant toalter plaintext into chipertext which in turn creates chipertext from plaintext by using password key.²The implementation of the program in this research is a prototype of Hospital’s web facilitated withencyption menus and decryption data which are meant to protect the saved data which are in turn accessedand processed by authorized people. The implementation of the program is built as a web application withJava Server Page (JSP) in NetBeans 6.0 with Password Based Encryption cryptography provided by JavaCryptography Extension (JCE).

Cryptography is a science which studying about safety of messages, so it makes themessages cannot be read by unauthorized persons. Cryptography have two kinds of algorithmfirst is encryption algorithm, that is algorithm altering plaintext become the ciphertext, and thesecond is decryption algorithm that is algorithm altering ciphertext become the plaintext,  thatconducive of message can only be made and read by authorized persons. Plaintext represent themessage able to be read,  while ciphertext is message which have pass by the encryption process,so that order the ciphertext difficult to be translated or read. And method of substitution andtranspotition method are some of conventional technique able to be used to protect the picturesfiles, so that produce the pictures files which do not easy to to be read. The conventionaltechnique basically use a same key to do the encryption  and decryption process.

Kriptografi (cryptography) merupakan ilmu dan seni untuk menjaga pesan agar aman. (Cryptography is the art and science of keeping messages secure) “Crypto” berarti “secret” (rahasia) dan “graphy” berarti “writing” (tulisan). Para pelaku atau praktisi kriptografi disebut cryptographers. Sebuah algoritma kriptografik (cryptographic algorithm), disebut cipher, merupakan persamaan matematik yangdigunakan untuk proses enkripsi dan dekripsi. Biasanya kedua persamaan matematik (untuk enkripsi dan dekripsi) tersebut memiliki hubungan matematis yang cukup erat. Enkripsi digunakan untuk menyandikan data-data atau informasi sehingga tidak dapat dibaca oleh orang yang tidak berhak. Dengan enkripsi data disandikan (encrypted) dengan menggunakan sebuah kunci (key). Untuk membuka (decrypt) data tersebut digunakan juga sebuah kunci yang sama dengan kunci untuk mengenkripsi (untuk kasus private key cryptography) atau dengan kunci yang berbeda (untuk kasus public key cryptography).