This makes encoding and decoding much trickier than hex encoding. So it takes four digits to encode three bytes of source data (4*6 = 3*8 = 24 bits). So, as you might expect, there are 64 "digits" used in base64 encoding:ĪBCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghij klmnopqrst uvwxyz0123 456789+/Įach digit encodes six bits of source data. For instance, if a hexadecimal encoding is 5,000 bytes long, a base64 encoding of the same source data will be 3,336 bytes long (saving 1664 bytes of transmission bandwidth).īinary uses two digits ( 01), base 10 - decimal - uses 10 digits ( 0123456789), base 16 - hexadecimal - uses 16 ( 0123456789ABCDEF). While hex-encoded data is twice the size of the original binary data, base64-encoded data is only 1.33 times the size. Base64 can be used similarly, and it has one advantage over hexadecimal encoding: It is more concise. In an earlier article, Easy String Encryption Using CryptoAPI in C++, I recommended converting encrypted data to hexadecimal to avoid special-character handling problems. You may see base64 used to transport encrypted data, which often contains such otherwise "awkward" characters.
#Vb net best way to encode data password
The text after the word, Basic is a base64-encoding of a username and password (specifically, that string encodes MyUserName:MyPassword). If you have ever worked with HTTP headers, you have probably seen:Ĭontent-Type: application/x-www-form-urlencoded Authorization: Basic TXlVc2VySUQ6TXlQYXNzd29yZA= You may see base64-encoded data in emails and in XML CDATA sections. Base64 data, on the other hand, is simple text you can assign it to a string data type, copy it, scan, and transfer it without worries. When you handle binary data, you need to take special care about embedded nulls, commas, quotes, apostrophes, the less-than, ampersand, and space characters, and so forth. We'll look at the algorithms - how encoding and decoding is usually done - and finally, I'll provide several examples of C++ source code, including a function that decodes base64 nearly ten times faster than commonly-used functions.īase64 is a way to represent binary data in a way that avoids some of the problems associated with binary data.
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#Vb net best way to encode data how to
It includes source code in C++ as well as examples of how to use standard Windows API functions for these tasks. This article surveys and compares options for encoding and decoding base64 data.