2012년 05월 04일
불가역 패스워드 함수
개요
패스워드가 입력한 내용대로 보존되면 데이터 베이스를 관람가능한 사람에게 노출된다.
base64변환이나 복원이 가능한 경우도 복원기술을 가진 사람에게 노출되게 된다.
그러므로 패스워드를 본존할 때에는 불가역 암호로 하는게 일반적이다.
불가역 암호는 복원이 불가능한 암호이다.불가역암호를 사용한 패스워드인증을 행할때에는 패스워드만을 암호화 하면 동일 패스워드를 가진 경우 같은 암호데이터가 디비에 등록되 마찬가지로 어느정도 노출 가능성이 있기에 유니크한 유저명과 패스워드를 가해 암호화 하는게 좋다.
/-* * 유저명과 패스워드로 메세지 다이제스트를 작성해 BASE64엔코드로 반환 * * @param userName 유저명 * @param password 패스워드 * @return 생성된 다이제스트. * @throws NoSuchAlgorithmException Java 실행환경에 SHA-1가실장되있지 않을때 *- public static String build(String userName, String password) { String passDigest = null; if (password != null && 0 < password.length()) { MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-1"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } md.update(userName.getBytes()); md.update(password.getBytes()); byte[] digest = md.digest(); BASE64Encoder encoder = new BASE64Encoder(); String b64digest = encoder.encodeBuffer(digest); passDigest = b64digest.trim(); // 플랫폼에 따른 개행코드의 삭제 } return passDigest; }참고번역문서 (日
# by | 2012/05/04 16:57 | JAVA:PHP | 트랙백(22) | 덧글(0)
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