URL, HEX, BASE64 인코딩/디코딩
http://ostermiller.org/calc/encode.html
MD5 암호화
http://www.md5encryption.com
MD5 복호화
http://www.hashkiller.co.uk/md5-decrypter.aspx
http://md5decryption.com
SHA-1 암호화
http://www.sha1-online.com
SHA-1 복호화
http://www.hashkiller.co.uk/sha1-decrypter.aspx
출처: http://blog.serpongs.net/4 [설퐁의 블로그]