The digits 0, 1 and 8 are skipped due to their similarity with the letters O, I and B (thus "2" has a decimal value of 26). It uses an alphabet of A– Z, followed by 2– 7. The most widely used Base32 alphabet is defined in RFC 4648. Length of Base64 and Base32 notations as percentage of binary data Also, because it encodes 5 bytes to 8 characters (rather than 3 bytes to 4 characters), padding to an 8-character boundary is a greater burden on short messages (which may be a reason to elide padding, which is an option in RFC 4648). (1000 bits takes 200 characters, compared with 250 for Base16).īase32 representation takes roughly 20% more space than Base64.
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