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Official Description & Notes

What is Base64 encoding

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Base64 is a set of binary to text encoding schemes.The name base6 is taken from a specific MIME content transfer encoding,Base 64 encoding is a quite simple and reversible encoding scheme.

The characters set of the 64 symbol that are chosen to represent the 64 place-values for the base is not the same between implementations.Base64 encoding is still quite common on the internet now.

Its typical usage include:

1 Base64 encoding is used to encode character strings in LDIF files

2 Base64 encoding is used to encode binary files within scripts, thus avoid depending on external files

3 The data URI scheme can use Base64 to represent file contents

4 Hackes use Base64 to encode their tool to avoid antivirus detection

Base64 is a set of similar binary-to-text encoding method that represent binary data in an ASCII string format by translating it into a radix-64 string. The term Base64 is from a specific MIME content transfer encoding.Each base64 digit needs exactly 6 bits of information to be showed.

The Design of base 64 encoding

The special set of 64 characters that is chosed to represent the 64 place-values for the base varies between implementations. The general method is to choose 64 characters that are both members of a subset common to most encodings, and also printable.

This combination leaves the data unlikely to be modified in transit through information systems, such as email, that were traditionally not 8-bit clean. Such as , MIME's Base64 implementation uses A–Z, a–z, and0–9 for the first 62 values. Other variations share this property but differ in the symbols chosen for the last two values; an example is UTF-7.

The earliest instances of this type of encoding were created for dialup communication between systems, for example uuencode for UNIX, BinHex for the TRS-80 (later adapted for the Macintosh) — and could therefore make more assumptions about what characters were safe to use. For example, uuencode uses uppercase letters, digits, and many punctuation characters, but no lowercase.

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