Base62 Encoding

Question 1

What is Base-62? (Definition)

Answer

Base 62 is a numbering system that can also be used to encode binary strings. It uses 62 alphanumeric characters (10 digits 0-9, 26 uppercase letters A-Z and 26 lowercase letters a-z). The 62 symbols used in this base 62 are generally: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz.

Question 2

How to encrypt using Base62 cipher?

Answer

The binary data string is converted to base 62 (by a classical change of arithmetic base), the indexes of the 62 symbols are:

0	0	1	1	2	2	3	3	4	4	5	5	6	6	7	7	8	8	9	9
10	A	11	B	12	C	13	D	14	E	15	F	16	G	17	H	18	I	19	J
20	K	21	L	22	M	23	N	24	O	25	P	26	Q	27	R	28	S	29	T
30	U	31	V	32	W	33	X	34	Y	35	Z	36	a	37	b	38	c	39	d
40	e	41	f	42	g	43	h	44	i	45	j	46	k	47	l	48	m	49	n
50	o	51	p	52	q	53	r	54	s	55	t	56	u	57	v	58	w	59	x
60	y	61	z

Example: The string dCode, encoded in ASCII (01100100,01000011,01101111,01100100,01100101) is equivalent to the decimal number $ 430628103269_{(10)} $, which can be converted to base 62 in $ {7, 36, 3, 5, 39, 26, 53}_{62} $ or the characters 7a35dQr.

Question 3

How to decrypt Base62 cipher?

Answer

Take the base62 string and note the indexes of each character to obtain a base 62 number. Convert this number into binary or directly encode it in ASCII (or Unicode) to obtain the plain message.

Example: Decode R0Ow, R is 27, 0 is 0, O is 24 and w is 58 either the number $ {27,0,24,58}_{62} $ or in decimal $ 6436402_{(10)} $ or in binary $ 11000100011011000110010_{(2)} $ or b62 in ASCII code.

Question 4

How to recognize a Base62 ciphertext? (Identification)

Answer

Base-62 encoded strings contain only alphanumeric characters: numbers, uppercase and lowercase letters.

Example: Base62 is coded KixpUr22

Base62 is case sensitive. Uppercase (A-Z) and lowercase (a-z) characters represent different values.

Question 5

Why use Base 62?

Answer

Base62 maximizes the use of characters available in most text environments (letters and numbers), allowing data to be represented more compactly than number systems based on smaller bases, such as Base 10 or Basis 16.

Base 62 allows data to be compacted, it is used in URL shorteners (web page addresses), in the generation of unique identifiers in computer systems, etc.

Base 62 is sometimes used to store numbers in character strings.

Base62 Encoding

Base-62 Decoder

Base-62 Encoder

Answers to Questions (FAQ)

What is Base-62? (Definition)

How to encrypt using Base62 cipher?

How to decrypt Base62 cipher?

How to recognize a Base62 ciphertext? (Identification)

Why use Base 62?

Source code

Cite dCode

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Questions / Comments

0	0	1	1	2	2	3	3	4	4	5	5	6	6	7	7	8	8	9	9
10	A	11	B	12	C	13	D	14	E	15	F	16	G	17	H	18	I	19	J
20	K	21	L	22	M	23	N	24	O	25	P	26	Q	27	R	28	S	29	T
30	U	31	V	32	W	33	X	34	Y	35	Z	36	a	37	b	38	c	39	d
40	e	41	f	42	g	43	h	44	i	45	j	46	k	47	l	48	m	49	n
50	o	51	p	52	q	53	r	54	s	55	t	56	u	57	v	58	w	59	x
60	y	61	z

0	0	1	1	2	2	3	3	4	4	5	5	6	6	7	7	8	8	9	9
10	A	11	B	12	C	13	D	14	E	15	F	16	G	17	H	18	I	19	J
20	K	21	L	22	M	23	N	24	O	25	P	26	Q	27	R	28	S	29	T
30	U	31	V	32	W	33	X	34	Y	35	Z	36	a	37	b	38	c	39	d
40	e	41	f	42	g	43	h	44	i	45	j	46	k	47	l	48	m	49	n
50	o	51	p	52	q	53	r	54	s	55	t	56	u	57	v	58	w	59	x
60	y	61	z

0	0	1	1	2	2	3	3	4	4	5	5	6	6	7	7	8	8	9	9
10	A	11	B	12	C	13	D	14	E	15	F	16	G	17	H	18	I	19	J
20	K	21	L	22	M	23	N	24	O	25	P	26	Q	27	R	28	S	29	T
30	U	31	V	32	W	33	X	34	Y	35	Z	36	a	37	b	38	c	39	d
40	e	41	f	42	g	43	h	44	i	45	j	46	k	47	l	48	m	49	n
50	o	51	p	52	q	53	r	54	s	55	t	56	u	57	v	58	w	59	x
60	y	61	z