Re: Base64 decode -- RPG400-L

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Maybe an easier explanation but combining them gives a kind of completeness - "mangle" might be a technical term but not very concise, eh? :)

On 8/11/2020 1:28 PM, Patrik Schindler wrote:

Hello Vernon & Greg,

Am 11.08.2020 um 18:49 schrieb Vernon Hamberg <vhamberg@xxxxxxxxxxxxxxx>:

Base64 takes any byte-sequence and takes 6 bits of it at a time and uses that number as an index into a table of 64 (2*6) ASCII characters, comprising upper and lower case letters, the 10 digits, and a couple puncutation - 000000 -> A, for example.

Using this, it is possible to send binary data to any system - it does take 4 Base64 characters for every 3 bytes.

Or, explained more easily: Mangle binary data so it is represented by text (not actual language) contained within the original ASCII character set, to to be transferred to any ASCII capable system without loss of data because of different charsets, or even non 8-bit clean links. A leftover from ancient times, then called uuencode (and having a slightly different method).

Recommended reading:

https://en.wikipedia.org/wiki/Base64

https://en.wikipedia.org/wiki/Uuencoding

https://en.wikipedia.org/wiki/YEnc

:wq! PoC

PGP-Key: DDD3 4ABF 6413 38DE - https://www.pocnet.net/poc-key.asc

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