Networking

07:30 AM
Connect Directly
LinkedIn
RSS
E-Mail
50%
50%

Decoding SMTP Authentication Using Wireshark

In this video, Tony Fortunato shows how Wireshark can decrypt the Base54 encoding on an SMTP trace file.

In my last video, I discussed HTTP Basic authentication. I also demonstrated that some network protocol analyzers like Wireshark can decode the Base64 encoding scheme used by HTTP Basic.

In this video, I show you – using Wireshark -- that even the Simple Mail Transfer Protocol (SMTP) can use Base64 encoding as a very basic, weak form of encryption. 

Base64 is a binary-to-text encoding scheme that is generally used to transfer content-based messages and works by dividing every three bits of binary data into six bit units. This new data is represented in a 64-radix numeral system and as seven-bit ASCII text. Because each bit is divided into two bits, the converted data is 33%, or one-third, larger than the original data. Like binary data, Base64-encoded resultant data is not human readable.

The lesson here would be to be aware of what form of encryption you are using.

Tony Fortunato is a network performance expert who has been designing, implementing and troubleshooting networks since 1989. His company, The Technology Firm, provides clients of all sizes with services ranging from project management, network design, consulting, ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
thetechfirm
50%
50%
thetechfirm,
User Rank: Moderator
12/16/2015 | 4:02:38 PM
posted video interview discussing this article on LMTV
https://plus.google.com/u/0/events/cgd4074ik1muljf13kcqrund99o

Enjoy
Slideshows
Cartoon
White Papers
Register for Network Computing Newsletters
Current Issue
2014 Private Cloud Survey
2014 Private Cloud Survey
Respondents are on a roll: 53% brought their private clouds from concept to production in less than one year, and 60% ­extend their clouds across multiple datacenters. But expertise is scarce, with 51% saying acquiring skilled employees is a roadblock.
Video
Twitter Feed