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Base32

Tool for decoding / encoding in Base32 according to RFC 4648. Base 32 is a variant of Base64 which uses letters and numbers from 2 to 7 (and =) as basic symbols.

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Base32 -

Tag(s) : Character Encoding, Informatics

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Base32

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Base32 Decoder



Base32 Encoder



Tool for decoding / encoding in Base32 according to RFC 4648. Base 32 is a variant of Base64 which uses letters and numbers from 2 to 7 (and =) as basic symbols.

Answers to Questions

How to encrypt using Base32 cipher?

The Base32 code is described in RFC 4648 standard. It allows to encode with 32 characters:

ABCDEFGHIJKLMNOPQRSTUVWXYZ234567 and the = symbol optionally used as the final character (as in Base64hrefhref).

The message to be encoded is first treated as a binary string (according to a predefined encoding such as ASCIIhref or Unicodehref).

Example: Base is encoded in ASCIIhref (8-bit) 01000010,01100001,01110011,01100101

The string is then split every 5 bits, and optionally completed with 0s.

Example: The split gives the 32 bits 01000,01001,10000,10111,00110,11001,01 (three 0 needed at the end)

Each 5-tuple is then encoded in base 32href by the letter or the corresponding number according to the conversion table:

BinaryDecimalBase32
000000A
000011B
000102C
000113D
001004E
001015F
001106G
001117H
010008I
010019J
0101010K
0101111L
0110012M
0110113N
0111014O
0111115P
1000016Q
1000117R
1001018S
1001119T
1010020U
1010121V
1011022W
1011123X
1100024Y
1100125Z
11010262
11011273
11100284
11101295
11110306
11111317

Example: 01000 for I, 01001 for J, and so on. Until IJQXGZI

The standard indicates that the Base32 message must have a number of characters multiple of 8href. The message obtained must therefore be completed with the character = (padding char).

Example: Finally, the message Base is base32-encoded IJQXGZI=

How to decrypt Base32 cipher?

The Base32 decoding is similar to a mathematical base change.

Example: Decode the message INXWIZI= coded in Base 32href

Delete the final = of the encoded message.

Example: INXWIZI= becomes INXWIZI

Replace each character with its 5-bit value (cf conversion table) to create a binary string.

Example: I for 01000, N for 01101, etc. Until 01000,01101,10111,10110,01000,11001,01000

Read the binary string according to the encoding used (ASCIIhref, Unicodehref, etc.)

Example: The message is divided into bytes (8-bits) as follows: 01000011,01101111,01100100,01100101 (the last string composed of 0 is ignored), which corresponds to ASCIIhref (or Unicodehref) string Code

How to recognize a Base32 ciphertext?

A B32-encoded message

- is composed only of the characters 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567 =' (no 0,1,8,9)

- theoretically has a number of character multiple of 8href.

- ends with 0,1,3,4 or 6 characters = (equal).

- has a length greater than 40 to 60% of the original message

Why aren't digit 0 and 1 used in Base32?

The digit 0 is avoided not to be confused with the letter O, and the number 1 is also avoided for its resemblance to the letter I.

What are the variants of the Base32 encoding?

Base32 is similar to the Base64href which is much more commmonly used.

The z-base-32 code is a variant improved for reading and writing by men.

The mathematical basis 32 (or base32hex) is the most natural version for writing numbers in base 32href and uses the symbols 0123456789abcdefghijklmnopqrstuv

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Source code

dCode retains ownership of the source code of the script Base32 online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the online Base32 script for offline use, for you, your company or association, see you on contact page !

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