Area 51 » Technology

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Cryptography

Beta Q&A site for software developers, mathematicians and others interested in cryptography.

Announcements

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Possible duplicate: SO, math.stackexchange.com or area51.stackexchange.com/proposals/8766/…. @Mark Robinson, do you agree? – bigown Nov 15 '10 at 23:08
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@bigown - I'm not an expert so my honest answer is: I don't know. But since the answer to my question above is that it is for people doing cryptography, and since it already has 57 followers, I think it stands in its own right. – Wikis Nov 16 '10 at 8:20
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@Ravi, @Mark, Since this site was not mergeed with the security.stackexchange.com one, and that one does cover applied cryptography, as in developers using encryption and building cryptosystems, I would say this should be more in the direction of research / theoretical / conceptual / algorithmical / mathy parts of crypto. – AviD Nov 19 '10 at 9:55
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This proposal is now in the Beta phase — example questions are locked!

61 Example Questions (9 closed)

active oldest votes
up vote 0 down vote
I am writing a snail mail to a friend , how do I make it secure? [closed]
added by Ravi Vyas Jul 30 '10 at 5:46
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closed as off topic by random, qbi, warren, Wikis, samoz Aug 10 '10 at 2:34

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.
up vote 0 down vote
How can I encrypt a string in C#? [closed]
added by Blorgbeard Jul 30 '10 at 8:05
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closed as off topic by random, Ravi Vyas, qbi, ralu, warren Aug 3 '10 at 14:28

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.

Testing whether more programmery questions are on-topic.. – Blorgbeard Jul 30 '10 at 8:05
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stackoverflow.com is the place for such questions, IMHO. – qbi Aug 3 '10 at 12:52
How to do X in language Y is certainly a programming question, not a cryptography one. If you are asking how to actually implement a method (regardless of the language), that is different. – Mark C Sep 18 '10 at 8:49
up vote 0 down vote
How to make my own encryption algorithm with JavaScript? [closed]
added by chanchal1987, edited by WikiSpeedia hang-around Aug 7 '10 at 14:44
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closed as off topic by warren, Mike Rosulek, sp0rus, Souhardya Maity, deceze Sep 7 '10 at 9:50

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.

2  
off-topic example – chanchal1987 Aug 7 '10 at 11:51
up vote 0 down vote
Is [some cipher] resistant to differential cryptanalysis?
added by Joe Fitzsimons Sep 17 '10 at 15:31
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up vote 0 down vote
I've forgotten the password to a really important Word file - how can I recover it? [closed]
added by gkrogers Sep 23 '10 at 14:22
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closed as off topic by Jack Lloyd, Ravi Vyas, igelkott, HoLyVieR, snmcdonald Oct 16 '10 at 1:36

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.
up vote 0 down vote
I have the choice or WEP, WPA or WPA2 in my router configuration screen - which should I choose? [closed]
added by gkrogers Sep 23 '10 at 14:25
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closed as off topic by Jack Lloyd, Ravi Vyas, igelkott, CodeInChaos, snmcdonald Oct 16 '10 at 1:35

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.
up vote 0 down vote
Why can't you use binary search to compute the discrete logarithm?
added by bitmask Oct 16 '10 at 18:16
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up vote 0 down vote
Why does computational differential privacy provide more accuracy over information-theoretically secure differential privacy ?
added by M. Alaggan Nov 10 '10 at 20:35
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up vote 0 down vote
What does [coded text] say? [closed]
added by John Nov 23 '10 at 21:51
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closed as off topic by Michael Stum, glebm, Jack Lloyd, samoz, Tangurena Dec 2 '10 at 20:56

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.

1  
Not a good question I know, but still likely to be asked on the site. – John Nov 23 '10 at 21:52
up vote 0 down vote
What should be considered when choosing the seed for PBEWithMD5AndDES?
added by Thilo Dec 3 '10 at 2:41
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1  
If you are using DES, the seed is the least of your concerns. ;) – PulpSpy Dec 3 '10 at 3:33
up vote 0 down vote
In what ways is SHA superior to MD5?
added by CrazyJugglerDrummer Dec 4 '10 at 0:52
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What are some good ways to show people how weak their passwords are?
added by CrazyJugglerDrummer Dec 4 '10 at 0:53
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How can I create a file that has the same MD5 checksum as another file?
added by CrazyJugglerDrummer Dec 4 '10 at 0:55
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up vote 0 down vote
What's the best software to crack Windows XP administrator passwords?
added by CrazyJugglerDrummer, edited by WikiSpeedia hang-around Dec 13 '10 at 12:09
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up vote 0 down vote
Roughly, how do I compare the efficiency of a standard protocol to a shorter pairing-based one with fewer modular exponentiations but some pairings?
added by PulpSpy Dec 6 '10 at 20:52
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up vote 0 down vote
How to design/choose encryption algorithm to encrypt the signal which has to fit into the frequency band from [A] Hz to [B] Hz
added by Niko Dec 10 '10 at 16:32
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up vote 0 down vote
The communications channel is designed to transmit voice signal. Is there a way/how to encrypt the conversation in order to send it over the channel?
added by Niko Dec 10 '10 at 16:37
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up vote 0 down vote
How can I make my desktop software that I am programming more secure from vulnerabilities?
added by Pearsonartphoto Dec 16 '10 at 13:02
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up vote -1 down vote
How can I prove the randomness of a pseudo random number generator?
added by qbi, edited by WikiSpeedia hang-around Aug 2 '10 at 13:26
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8  
Maybe "measure" is a better verb. – Tadeusz A. Kadłubowski Aug 1 '10 at 18:17
The only randomness in a PRNG is the seed. You can however: (1) prove "pseudo-randomness" or (2) measure statistical properties. Proving "pseudo-randomness" means proving that a bounded algorithm cannot distinguish between the output of the PRNG and a true random string. Measuring statistical properties (which doesn't prove it is secure) can be done with tests in FIPS 140-2 or a tool like Diehard. The question could be made more specific to address which aspect is of interest. – PulpSpy Oct 16 '10 at 22:49
up vote -2 down vote
I just came up with a new encryption algorithm: <code>...</code>. Are there any weaknesses? [closed]
added by Eclipse, edited by WikiSpeedia hang-around Dec 13 '10 at 12:15
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closed as off topic by Wikis, qbi, warren, Zack, Nicholas Knight Aug 5 '10 at 7:59

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.

1  
Meant to be off-topic - if someone is designing their own crypto algorithms, academic journals are the place for these, not a question and answer website. – Eclipse Jul 30 '10 at 20:10
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This is one of the major questions that get ask in this field. If it pops up we should show a big red warning sign. :-) – qbi Jul 31 '10 at 19:12
1  
Similarly to "no original research" rule at wikipedia. – Tadeusz A. Kadłubowski Aug 1 '10 at 18:14
up vote -2 down vote
Where do the Names of Alice, Bob and Eve come from? [closed]
added by Michael Stum Oct 15 '10 at 22:41
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closed as off topic by snmcdonald, Jack Lloyd, PulpSpy, Adam Paynter, Tangurena Dec 2 '10 at 20:56

This question does not relate to the topic of the proposal.
It was closed as part of an automated migration of off-topic to close votes on September 29, 2011.

good off-topic examples are only slightly off-topic, where as this one is way, way off-topic – bemace Oct 17 '10 at 2:57
Cool, I actually thought this was on-topic as I absolutely see people working in that field asking themselves the same, if they don't already know :) So the Area51 On/OffTopic categorization works! – Michael Stum Oct 20 '10 at 2:00
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