Base 64 - meaning and definition. What is Base 64
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What (who) is Base 64 - definition

GROUP OF BINARY-TO-TEXT ENCODING SCHEMES USING 64 SYMBOLS (PLUS PADDING)
Radix-64; Base64 (encoding scheme); Modified Base64; Base64encoded; Base 64; Base-64; BASE64; Tetrasexagesimal; Radix64; Radix 64; Base64url; Base64 encoding

base 64         
<file format, algorithm> A file format using 64 ASCII characters to encode the six bit binary data values 0-63. To convert data to base 64, the first byte is placed in the most significant eight bits of a 24-bit buffer, the next in the middle eight, and the third in the least significant eight bits. If there a fewer than three bytes to encode, the corresponding buffer bits will be zero. The buffer is then used, six bits at a time, most significant first, as indices into the string "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" and the indicated character output. If there were only one or two input bytes, the output is padded with two or one "=" characters respectively. This prevents extra bits being added to the reconstructed data. The process then repeats on the remaining input data. Base 64 is used when transmitting binary data through text-only media such as electronic mail, and has largely replaced the older uuencode encoding. (2004-07-17)
Base64         
In computer programming, Base64 is a group of binary-to-text encoding schemes that represent binary data (more specifically, a sequence of 8-bit bytes) in sequences of 24 bits that can be represented by four 6-bit Base64 digits.
64 (magazine)         
  • ''64'' magazine logo
RUSSIAN CHESS AND DRAUGHTS PERIODICAL
64 (chess); 64 (chess magazine)
64 was a Russian chess magazine and draughts publication, published in Moscow. Its name referred to the number of squares on a chessboard.

Wikipedia

Base64

In computer programming, Base64 is a group of binary-to-text encoding schemes that represent binary data (more specifically, a sequence of 8-bit bytes) in sequences of 24 bits that can be represented by four 6-bit Base64 digits.

Common to all binary-to-text encoding schemes, Base64 is designed to carry data stored in binary formats across channels that only reliably support text content. Base64 is particularly prevalent on the World Wide Web where one of its uses is the ability to embed image files or other binary assets inside textual assets such as HTML and CSS files.

Base64 is also widely used for sending e-mail attachments. This is required because SMTP – in its original form – was designed to transport 7-bit ASCII characters only. This encoding causes an overhead of 33–37% (33% by the encoding itself; up to 4% more by the inserted line breaks).