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Base 64 Tutorial| Category | | | Summary | | | Body | Base64 Encoding Tutorial
Here's how it works.
Encoding only - you'll have to figure out the decoding.
Base64 works on groups of 3 characters:Lets take 3 characters: mic
Convert to ACSII: i.e. 109, 105, 99
Convert to Binary 01101101/ 01101001/ 01.....
Split binary string into groups of 6 bits: 011011 010110 100101 etc
Convert to Decimal: 27, 22, 37
Find the Base64 encoding table on web. http://www.faqs.org/rfcs/rfc1521.html
Substitute the numbers for the letters of the Base64 encoding table:i.e. 27 => b, 22 => W, 37 => l
Simple:Rules for understanding Base 64
1. Find a base 64 encoder on the web
2. Learn to differentiate between file headers and data.
3. Encode a known (short) string
4. Encode the string using the approach outlined above.
5. Verify that both results match
6. Now decode the encoded string (hint: reverse encode)
7. Write a 'decode' C program
8. Refine your program so that code is terse. Proxomitron can be used to 'see' some base64 encoded data. Check it out. |
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This article was imported from the CyberArmy University site. (original author: )
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