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, though uuencode is more common. (1995-03-21) | ||||
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Base 64 definition was found in categories: Language, Idioms & Slang(1) Encyclopedia(1)
Base 64 Definition from Language, Idioms & Slang Dictionaries & Glossaries
| hEnglish - advanced version |
base 64
base 64
a file format using 64 ascii characters to encode the six bit binary data values 0-63.
base 64
a file format using 64 ascii characters to encode the six bit binary data values 0-63.
Base 64 Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Base64
Base64 is a positional notation using a base of 64. It is the largest power-of-two base that can be represented using single printable ASCII characters. This has led to its use as a transfer encoding for e-mail among other things. All well-known variants that are known by the name Base64 use the characters A–Z, a–z, and 0–9 in that order for the first 62 digits but the symbols chosen for the last two digits vary considerably between different systems. Several other encoding methods such as uuencode and later versions of binhex use a different set of 64 characters to represent 6 binary digits, but these are never called by the name Base64.
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