base 64

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.
References in periodicals archive ?
Attitash _ Tue 6:31 am MG machine groomed 24-48 base 64 of 67 trails, 96% open 21 miles, 300 acres, 6 of 11 lifts, Mon-Fri: 9a-4p Sat/Sun: 8:30a-4p
03's four new spam-blocking features: Identify adult subjects even if subject line is using an alternate character set or Base 64 encoding; automatically add a sender's IP address to the spam content category of the integrated content filter database if the majority of e-mail from that address is spam; conduct a DNS query on known spam URLs and add the corresponding IP addresses to the spam category in the content filter database; and check the IP addresses of unknown URLs to determine whether they are from a spam-categorized IP address.
Sun Peaks Resort pp 50-96 base 64 trails 5 lifts Fri-Tue:
Brian Head 5- new pp -64 base 6 lifts 9a-4:30p Brighton 7- new pdr -104 base 64 trails 6 lifts Sun: 9a-4p; Mon- Sat: 9a-9p Deer Valley Resort pp -95 base 84 trails 18 lifts 9a-4p Elk Meadows 6- new pp -55 base 36 trails 6 lifts 9a-4p Nordic Valley pp -60 base 18 trails 2 lifts
Sun Peaks Resort pp 50-114 base 64 trails 5 lifts Fri-Tue:
Red Lodge Mountain mgs 40-50 base 70 trails 7 lifts 9a-4p Showdown 2- new pdr 47-52 base 4 lifts 9:30a-4p; Wed-Sun The Big Mountain pdr 45-110 base 67 trails 7 lifts 9a-9p New Mexico Angel Fire Resort pp 24-34 base 63 trails 5 lifts sm Enchanted Forest mgs -16 base Red River mgs 28-35 base 50 trails 5 lifts sm Sandia Peak mgs -13 base 3 trails 2 lifts sm Sipapu hp -28 base 20 trails 3 lifts Ski Apache mgs -33 base 51 trails 10 lifts sm 8:45a-4p Ski Rio pdr 27-55 base 70 trails 6 lifts sm 9a-4p Ski Santa Fe mgs -50 base 37 trails 5 lifts Taos Ski Valley pp 48-64 base 72 trails 11 lifts Utah Alta 9- new pp -104 base 8 lifts 9:15a-4:30p Beaver Mountain pp -90 base 3 lifts Brian Head pp -71 base 6 lifts 9a-10p Brighton 11- new pp -99 base 64 trails 6 lifts 9a-9p