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I found this, and want to know what it decodes to and what type of encoding it is:

ZGMzMGRjODlAc25hcGpveS5jb20=
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3 Answers 3

up vote 17 down vote accepted

It is, as I expected, Base64. You can recognize it by the equal sign at the end. It translates to some sort of email address:

If you want to know more about Base64, there is a great Wikipedia article.

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2  
Quick clarification: Base64 doesn't always have an equal sign in it, but = or + are signals that it's probably base64. –  Christian Mann Jan 14 '12 at 23:23
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Didn't know the + sign was used as well. The chance of it containing an equal sign is 2/3 by the way, as it's a space filler for incomplete 3-byte sequences. –  Simon Verbeke Jan 14 '12 at 23:26
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VGhhbmtzISAuLi4uYW5kIHNvcnJ5LCBTbmFwSm95IDsp –  Nathan J. Brauer Jan 14 '12 at 23:48
    
@NathanJ.Brauer Is this question and your comment a very geeky kind of spam? :) –  Marek Grzenkowicz Jan 19 '12 at 15:26
    
Heh, no, I'm not that smart. ;) Really, I just wanted to decode their jobs puzzle but was too tired to figure it out completely on my own. –  Nathan J. Brauer Jan 26 '12 at 19:35

The encoding is called Base64, and it decodes to some email address.

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When in need of detailed and specific information about an Internet standard I always look and see if there's an RFC (Request For Comments) for it. For the Base64-encoding, take a look at this document: The Base16, Base32, and Base64 Data Encodings (RFC 4648).

@Simon Verbeke: There are two versions of the Base64 alphabet. Take a look at the following tables in the RFC 4648.

"Table 1: The Base 64 Alphabet" ("base64")

"Table 2: The "URL and Filename safe" Base 64 Alphabet" ("base64url")

NOTE: The "base64url" encoding should not be regarded as the same as the "base64" encoding and should not be referred to as only "base64".

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