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Base 92 Encoding

Tool for decoding or encoding with Base 92. Base 92 code allows binary information to be stored in ASCII format with minimal data loss.

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Base 92 Encoding -

Tag(s) : Character Encoding

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# Base 92 Encoding

## Base 92 Decoder

 Results format String of Printable Characters (ASCII/Unicode) Hexadecimal 00-7F-FF Decimal 0-127-255 Octal 000-177-377 Binary 00000000-11111111 Integer number File to download

## Answers to Questions (FAQ)

### What is Base 92? (Definition)

Base 92 is a data encoding system that uses 92 printable ASCII characters to represent information. This system allows data to be encoded more efficiently than more common encoding bases like Base64 or Base85.

### What characters are used in Base 92?

The 92 character alphabet used in Base 92 is indexed as follows:

(empty) 9 19 29 39 49 59 69 79 89 ~ + 5 ? I S ] h r | ! , 6 @ J T ^ i s } # - 7 A K U _ j t \$ . 8 B L V a k u % / 9 C M W b l v & 0 : D N X c m w ' 1 ; E O Y d n x ( 2 < F P Z e o y ) 3 = G Q [ f p z * 4 > H R \ g q {

In practice, only 91 signs are used in basic calculations, the 92nd (the tilde ~) is only used to indicate an empty string.

### How to encode data in Base 92?

To encode data in Base 92, cut the data into 13-bit blocks to make 2 base 91 characters (yes 91 and not 92).

Example: dCode is written in binary (ASCII) 0110010001000011011011110110010001100101
Blocking of 13 bits gives 0110010001000,0110110111101,1001000110010,1
The converting 0110010001000 (base 2) gives ' 3208' (base 10) or 35×91+23. Character 35 of base 91 is E and character 23 is 9 whose block is coded E9.

Complete the last block with 0 on the right. Pad to 6 bits if the block contained 6 bits or less, otherwise pad to 13 bits.

Example: The last block 1 (length 1 bit) is completed to 100000 (completed over 6 bits) or 32 in base 10, and symbol 32 is B.
The complete coded message is E9H]U3B

### How to decode Base 92?

For each pair of characters, note the value of each symbol in the Base 92 alphabet. Multiply the first by 91 and add them.

Example: Decode 9A2?VBWl by splitting it into pairs 9A 2? VB Wl. The first character 9 has the index 23, and A the code 31. The calculation is 23×91+31=2124.

For each number obtained, convert it to binary, completing it if necessary on the left to obtain 13 bits.

Example: 2124 in base 10 corresponds to 100001001100 in binary, as this number is only 12 bits, add an initial zero or 0100001001100

The binary sequence obtained (by concatenation of 13-bit numbers) corresponds to the plain message. If the message was originally encoded in 8-bit ASCII, then each byte corresponds to an ASCII character.

Example: The binary sequence is 01000010,01100001,01110011,01100101,00111001,00110010 or the 6 Base92 characters

### How to recognize a Base 92 ciphertext? (Identification)

The message is composed of the 91 characters of the Base92 alphabet.

The character ~ appears alone or does not appear.

If the message length is odd, then the last character can only be among the first 64 characters of the alphabet.

### Why use base 91?

Each 13-bit block can encode 2^13 = 8192 values, while 2 base 91 characters encode 91^2=8281 values. The encoding loss is therefore minimized for an alphabet of 91 symbols.

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Base 92 Encoding on dCode.fr [online website], retrieved on 2024-09-10, https://www.dcode.fr/base92-encoding

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