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CodeBase64 Explanation

Posted on 2007-04-04
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Last Modified: 2012-06-21
I need to understand CodeBase 64.  If I CodeBase 64 a simple string like "Hi there", is there a one to one mapping between the encoded letters and each character?
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Question by:lcor
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5 Comments
 
LVL 86

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jkr earned 125 total points
ID: 18850827
Yes, there is a "one to one" mapping. For more details, see http://en.wikipedia.org/wiki/Base64
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by:mokule
ID: 18850889
No, there is no one to one mapping
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Assisted Solution

by:mokule
mokule earned 125 total points
ID: 18850937
For example MMM is encoded TU1N
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Assisted Solution

by:Infinity08
Infinity08 earned 125 total points
ID: 18850969
mokule, 1-to-1 means that a string encoded in Base64 can be decoded again to the same string, and ONLY that string. ie. a string corresponds to one encoded Base64 string, and vice versa.

So, what jkr said is correct ... there is a 1-to-1 mapping between a string and its Base64 encoding.

However, if lcor wanted to know whether 1 character corresponds to one encoded character, then that's not true. Each block of three characters however will always have the same encoded result. And then you're correct, mokule ...
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Assisted Solution

by:bijopuli
bijopuli earned 125 total points
ID: 18850972
Hi lcor

are u asking bout base64 encoding:
if it is so here are the links for u:

An intro on Base64:

http://email.about.com/cs/standards/a/base64_encoding.htm

A nice tool to experiment:

http://www.motobit.com/util/base64-decoder-encoder.asp

code in c++:

http://www.marcsweb.com/mnweb_ccppbase64.shtml

Regards
Bijo.
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