How to mask an email address using m-code?
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For example my email could be masked as follows:
[char([21 8 4 13 8 0 21 0]+97) '@gmail.com']
But this is trivial and very redundant. I am curious about your concepts on this. Please paste your mask on your (or mine or other real-like one) email address - Lets find out how it can be done in the most clever way.
5 个评论
Paulo Silva
2011-2-16
just leave it in plain text and generate a p-code file
Vieniava
2011-2-16
Matt Tearle
2011-2-16
I don't understand what you're after. What's wrong with your solution for anti-spam purposes? Can you explain your criteria more fully? Thx
Vieniava
2011-2-16
Matt Tearle
2011-2-16
OK, sorry, I'm being dense, I guess. You can easily use double('foo@bar.com') to get a numeric representation, then char to flip back, so... I'm missing something. Are you looking for a simple encoding (cipher)? Because most anti-spam obscuring just adds stuff into a string (like 'f o o(at)barNOSPAM(dot)com'). But that's just string manipulation. For a cipher approach, you're assuming someone can decipher it (eg char <-> double), and the result isn't human-readable -- is that what you're after?
采纳的回答
Matt Fig
2011-2-16
I don't quite know what you are after either, even with your response to Matt. If that is too long, I don't know what is shorter except just writing out the email address. How about these:
fliplr('moc.liam@liameym')
char(max(['m)m-i)@0a&l+c/m';'3y/a&l-m/i0.%o-']))
strrep('tytail@tail.cot','t','m')
strrep('tytail@tail.cot',116,109)
char('nznbjmAnbjm/dpn' - 1)
4 个评论
Andrew Newell
2011-2-16
This could be the start of the first Cryptic Matlab Contest!
Vieniava
2011-2-16
Matt Fig
2011-2-16
I prefer the last one myself.
Vieniava
2011-2-16
更多回答（4 个）
Jan
2011-2-16
1 个投票
I'm using a trivial masking by using an uppercase string instead of a - character, e.g. "matlab@nMINUSsimon.de". Although I never got any spam to this address, I decided to insert the current year: "matlab.THISYEAR@nMINUSsimon.de", such that I can change the address each year.
But this is already too complicated for some human readers: I got not a single spam, but about 10 messages (through the "Contact the author" form) from CSSM users per year complaining about a not working address...
Therefore I think, that "[char([21 8 4 13 8 0 21 0]+97) '@gmail.com']" will increase the mail noise instead of reducing it. I assume "REM0VE_TH1S_foo@bar.com" would be more efficient.
Walter Roberson
2011-2-16
0 个投票
Sounds like you are looking for Kolmogorov Complexity -- the shortest algorithm for producing a given output.
Walter Roberson
2011-2-17
char(23+mod(1.332.^'ihRcilh? yoly^UP`0th^',96))
char(23+mod(1.145.^'UL:QL?U?Ppz?Lst Gz',96))
char(22+mod(1.3107.^'8s~+sn,ScPP>%1o8Y%,aq',96))
Encoder:
S='myemail@mail.com';
L=(10001:13354)/10000;for d=0:45;for P=L;[tf,idx]=ismember(S,char(d+mod(P.^(0:127),96)));if sum(tf)==length(S)&all(idx>31 & idx<128);fprintf('char(%d+mod(%0.4f.^''%s'',96))\n',d,P,char(idx-1));return;end;end;end
Note: using 1.0001:.0001:1.3354 does not work because of colon round-off error. The upper bound 1.3354 is the largest 4-decimal-place number such that P^127 <= 2^53
Jan's address with the year was the only one of the group that required the 4 digit base.
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