Base 64 Encoder/Decoder gives the user the ability to encrypt and decrypt text.
Centricorp’s Base 64 Encoder/Decoder is a very useful tool. Base 64 Encoder/Decoder will offer the user the ability to easilyencrypt and decrypt text.
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What is Base64?
Base 64 literally means a positional numbering system using a base of 64. It is the largest power of two base that can be represented using only printable ASCII characters. This has led to its use as a transfer encoding for email among other things.
All well-known variants of base 64 use the characters A?Z, a?z, and 0?9 in that order for the first 62 digits but the symbols chosen for the last two digits vary considerably between different systems that use base 64.
In MIME e-mail base64 is a data encoding scheme whereby an arbitary sequence of bytes is converted to a sequence of printable ASCII characters. It is defined as a MIME content transfer encoding for use in internet e-mail. The only characters used are the upper- and lower-case Roman alphabet characters (A?Z, a?z), the numerals (0?9), and the “+” and “/” symbols, with the “=” symbol as a special suffix code.
Full specifications for this form of base64 are contained in RFC 1421 and RFC 2045. The scheme is defined to encode a sequence of octets (bytes). This matches up with the definition of files on almost all systems. The resultant base64-encoded data has a length that is greater than the original length by the ratio 4:3, and typically appears as seemingly random characters.
To convert data to base64, the first byte is placed in the most significant eight bits of a 24-bit buffer, the next in the middle eight, and the third in the least significant eight bits. If there are fewer than three bytes to encode, the corresponding buffer bits will be zero.
The buffer is then used, six bits at a time, most significant first, as indices into the string “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/” and the indicated character output. If there were only one or two input bytes, only the first two or three characters of the output are used and are padded with two or one “=” characters respectively.
This prevents extra bits being added to the reconstructed data. The process then repeats on the remaining input data.
Basic spam scanners which do not decode Base64 messages will often pass messages in Base64 since they appear random enough, or do not contain keywords in the Base64 text detected to be spam.
UTF-7 introduced a system called Modified Base64. This data encoding scheme is used to encode the UTF-16 used as an intermediate format in UTF-7 into printable ASCII characters.
It is a variant of the base64 used in MIME. UTF-7 was intended to allow use of unicode in e-mail without using a separate content transfer encoding. The main difference it has versus the MIME variant base64 is that it does not use the “=” symbol for padding, as that character tends to require a fair amount of escaping. Instead, it pads the octet bits with zeros.
Modified Base64 is standardized as RFC 2152, A Mail-Safe Transformation Format of Unicode.
In the P10 server-server protocol used by the IRCu IRC daemon and compatible software, a version of base64 is used to encode client/server numerics and binary IP adresses.
Client and server numerics have fixed sizes which match up with an exact number of base64 digits so no padding is needed. Binary IP addresses have leading zero bits added to make them fit. The symbol set is slightly different from the MIME one using [] instead of +/.
BASE64 encoding can be helpful when fairly lengthy identifying information is used in an HTTP environment. Hibernate, a database persistence framework for Java objects, uses BASE64 encoding to encode a relatively large unique id (generally 128-bit UUIDs) into a string for use as an HTTP parameter in HTTP forms or HTTP GET URLs.
Also, many applications need to encode binary data in a way that is convenient for inclusion in URLs, including in hidden web form fields, and BASE64 is a convenient encoding to render them in not only a compact way, but in a relatively unreadable one when trying to obscure the nature of data from a casual human observer.
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