#BASE64 ENCODING JAVA ISO#
This subset has the important property that it's represented identically in all versions of ISO 646, including US-ASCII, and all characters in the subset are also represented identically in all versions of EBCDIC. The 65th character ( =) is used to pad Base64-encoded text to an integral size as explained shortly.
Here is the alphabet: Value Encoding Value Encoding Value Encoding Value Encoding They work with a 65-character subset of US-ASCII where each of the first 64 characters maps to an equivalent 6-bit binary sequence. Base64 encoding and decodingīase64 relies on simple encoding and decoding algorithms. For this example, the image would be shown inline with the rest of the message.
#BASE64 ENCODING JAVA SOFTWARE#
The recipient's email software will Base64-decode the encoded textual image to restore the original binary image. Note that the entire encoding for this or any other example is about 33 percent larger than the original binary data. indicates text that I haven't shown for brevity. The illustration shows that this encoded image starts with / and ends with =. O24sSCOlaaFYLUhjky4x9PSsKL5bJsdWkAz3xirH2dZLy1DM2C44zx1FZqL2PTXY/9k= I4rf2dkZSbOjt7hhEzwcujA4I7Gust75pYVwAPpXn+kzNLOVYD7xFegWEKPkHsM/pU1F0NKbNS32 NOMbnDUk2bGh26x2yiJcsoBIrvtPe3muBbTRGMdeufmH+Nct4chUXpwSPk/qK9GtJRMWWVFbZ0JH 9j/4R/+RXhpZgAATU0AKgAAAAgACgEPAAIAAAAGAAAAhgEQAAIAAAAKAAAAjAESAAMAAAABAAYAĪAEaAAUAAAABAAAAlgEbAAUAAAABAAAAngEoAAMAAAABAAIAAAExAAIAAAAHAAAApgEyAAIAAAAUĪAAArgITAAMAAAABAAEAAIdpAAQAAAABAAAAwgAABCRBcHBsZQBpUGhvbmUgNnMAAAAASAAAAAEA Your email software Base64-encodes the image and inserts the equivalent text into the message, as illustrated below: For example, you attach an image to an email message and want the image to arrive at the other end without being garbled. Later, it was officially presented as Base64 in RFC 2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies, and subsequently revisited in RFC 4648: The Base16, Base32, and Base64 Data Encodings.īase64 is used to prevent data from being modified while in transit through information systems, such as email, that might not be 8-bit clean (they might garble 8-bit values). Base64 request for comment documentsīase64 was first described (but not named) in RFC 1421: Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication Procedures. Each Base64 digit represents exactly 6 bits of binary data. What is Base64?īase64 is a binary-to-text encoding scheme that represents binary data in a printable ASCII string format by translating it into a radix-64 representation. What is Base64 and how do I use this API? This post answers these questions. Some will also remember Java 8 for introducing various small but useful features such as the Base64 API. Java 8 will be remembered mainly for introducing lambdas, streams, a new date/time model, and the Nashorn JavaScript engine to Java.
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