33 posts tagged with cryptography. (View popular tags)
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Is it possible to securely anonymize identifers while having the capacity to reverse the anonymization?

Anonymizing identifiers question. We have datasets with unique client identifiers. We get many requests from researchers for anonymized datasets for analyses. I'd like to find an operation that could securely create anonymous identifiers but that would also allow us to de-anonymize the records if needed. [more inside]
posted by jasper411 on Feb 3, 2012 - 16 answers

 

pickle teapot enthusiasm membrane

this xkcd panel talks about human friendly passwords, that there is more entropy in four random english words eg: 'pickle teapot enthusiasm membrane' than the standard password format of about ten gibberish characters 'S@Nt&KLaWs'. Has anyone integrated this idea into a public-key cryptography system to allow keys that are words therefore more memorable, or encrypting and hashing into english words? what [ are / would be ] the [problems/other interesting qualities] of such a system?
posted by compound eye on Dec 15, 2011 - 27 answers

Concealing a Fixed Password

A software application needs to supply a fixed password to an outside hardware device that it talks to. How can that password be concealed from hackers who take apart the software or the computer it's running on? [more inside]
posted by Paquda on Nov 24, 2011 - 17 answers

The Pattern in the Rough

What tools are available for determining patterns in short, semi-random sequences of variables? [more inside]
posted by Orange Pamplemousse on Nov 23, 2011 - 8 answers

Password security

Password security strength question. [more inside]
posted by dfriedman on Nov 22, 2011 - 8 answers

Secure AES challenge-response.

How do I securely implement a cryptographic challenge-response in software if the software needs my AES key to create the challenge? [more inside]
posted by odinsdream on May 4, 2011 - 12 answers

Minimum cryptography recommendations from various countries?

I recently read that the US government considers AES suitable for classified information. Do other countries publish similar recommendations? [more inside]
posted by tomwheeler on Dec 27, 2010 - 6 answers

Recommend me a book on Cryptography/Cryptanalysis!

I get to teach myself Cryptography for a class, please help me pick my book! [more inside]
posted by zidane on Nov 14, 2010 - 12 answers

Seeking hotel cryptographer

I'm staying in an Embassy Suites hotel in Chicago this week. Today, I returned to the hotel to see that on three of the lower floors, each room had a stack of exactly two identical chairs placed outside the door. This struck me as really odd. What does it mean? Is it some kind of code for housekeeping or management? Photo here for reference.
posted by AngerBoy on Jul 28, 2010 - 15 answers

Imagine no encryption, I wonder if you can...

What if: RSA was just "cracked" due to a new discovery about prime numbers. What happens around the world on day 1? Total chaos? Or yawns? [more inside]
posted by archae on Jan 16, 2010 - 21 answers

Compute MD5 hash value?

What's the easiest way to compute the MD5 hash value of a file? [more inside]
posted by chitlin on Jul 23, 2009 - 18 answers

Feed me bites

How do I share images securely through an RSS feed? [more inside]
posted by gensubuser on May 6, 2009 - 8 answers

Trying Like Hell To Defeat The Purpose Of Encrypting Something In The First Place

How weak is it smart to allow my GPG key passphrase to get? [more inside]
posted by ChasFile on Aug 8, 2008 - 8 answers

Help a PGP/GPG noob hold a key signing party.

Help a PGP/GPG noob hold a key signing party. [more inside]
posted by zenja72 on May 26, 2008 - 12 answers

cryptography book question

Help me find this cryptography book... [more inside]
posted by Marky on Mar 16, 2008 - 8 answers

Help me puzzle-hack with Python!

What are some fun and simple puzzles or cryptography I can solve with Python to help me learn the basics? [more inside]
posted by cowbellemoo on Feb 28, 2008 - 12 answers

Yayyy! Cryptography. Yayy!

Where can I find some good resources that contrast public key cryptography algorithms (like RSA) with Elliptic Curve? [more inside]
posted by pallak7 on Dec 5, 2007 - 5 answers

Cracking a Kingdom of Loathing code

AskMefi, put on your cryptography hats and help me crack a code... [more inside]
posted by UKnowForKids on Jul 11, 2007 - 23 answers

Where can I get a reproduction of the Voynich Manuscript?

Where can I purchase a color-nicely bound reproduction of the Voynich Manuscript? [more inside]
posted by dmd on Apr 17, 2007 - 7 answers

Puzzle master wanted!

Can someone direct me on the right path to break this code? [more inside]
posted by neurodoc on Sep 16, 2006 - 12 answers

What is the point of using a salt when encrypting passwords in a web application?

What is the point of using a salt when encrypting passwords in a web application? [more inside]
posted by chrismear on Aug 26, 2006 - 15 answers

KidCrypto

Cryptofilter: My daughter is at summer camp and I can snail mail her or I can send email that will be printed out and delivered. The email is fast but readable by whoever prints/delivers the paper etc. Looking for a cipher that would be easy to learn and use... [more inside]
posted by kaytrem on Aug 8, 2006 - 21 answers

Can this be decrypted?

Is Scientific American's spell-checker broken? (via justkevin) [more inside]
posted by Blazecock Pileon on Aug 4, 2006 - 9 answers

Encryption for an entire hard disk partition

What's the best way to encrypt an external hard disk? (Mac OS X) [more inside]
posted by dance on Apr 22, 2006 - 4 answers

Spotted on the T: OFFICIAL CYPHER

So last night on the train I saw a passenger with a small blue paper book titled "OFFICIAL CYPHER" [more inside]
posted by sol on Mar 21, 2006 - 10 answers

Some memories should be secret

CryptographyFilter: I'm an obsessive journaler, partly because I enjoy writing ideas etc down in my journals, partly because I have a terrible memory. Every now and then I would like to be able to record something in my journal that I wouldn't want to be read by someone who was less respectful of my privacy than I would hope them to be, or by someone who picked up one of my journals (which always have my contact details in the front) should I misplace one. [more inside]
posted by anonymous on Jan 2, 2006 - 56 answers

How could the NSA's snooping be foiled?

Could the US government's efforts to scan the contents of everyone's email be overloaded by everyone routinely using encryption for every message? [more inside]
posted by pracowity on Dec 21, 2005 - 33 answers

Encrypting Chinese, pre-computers

A friend of mine and I were wondering today how encryption was done in character-based languages like Chinese and Japanese before the advent of computerization. Whereas all kind of substitution and transposition ciphers come to mind immediately for letter based languages like Latin, it isn't obvious how you could use them for a language with many thousands of distinct characters.
posted by sindark on Dec 5, 2005 - 9 answers

The end of time

How do we know the mathematical models of physics — equations modeling the universe — apply across the universe, to data we collect about the universe that may be billions of years old? (What would be the process for verifying this?) [more inside]
posted by Rothko on Dec 2, 2005 - 22 answers

Ancient chinese messaging/encryption system

Needed: a photo or at least more information about a particular system of coded communication supposedly used in ancient china along the Great Wall. Either my google-fu is failing me or I dreamed this whole thing up. [more inside]
posted by fatllama on Mar 9, 2005 - 2 answers

How can I recover a password given a couple of encrypted hash strings?

Given a couple of encrypted hash strings, I need to identify the algorithm used to generate the hashes so that I can brute-force decrypt them. More inside.. [more inside]
posted by mrbill on Jun 16, 2004 - 16 answers

Does anyone recognize this code that had something to do with annual ads placed in a college newspaper?

Prompted by the unsolved codes thread in the blue, I'm trying to remember the name of one that I didn't see there. I think I read about it on MeFi at some point. ISTR that it took (takes?) the form of annual ads in a college newspaper (out west somewhere?) on a given day. For some reason May Day is stuck in my head, but googling for it doesn't reveal anything. This went on for several years, and may still be occuring, but no one has ever figured out what it's all about. Does this ring any bells for anyone? My google fu is failing, and I'm going bonkers!
posted by jammer on May 18, 2004 - 4 answers

Does anyone know of any famous codes or ciphers that have gone unsolved for lengthy periods of time or remain unsolved?

Does anyone know of any famous codes or ciphers that have gone unsolved for lengthy periods of time or remain unsolved? I am thinking specifically of things like The May Day Mystery and the Voynich Manuscript (also here). So things more like those and generally less like the Beale Cipher. Maybe something to do with Art Brut or Outsider art or perhaps Kabbalic systems like Gematria. Or, if all else fails maybe something by the Rosicrucians or Freemasons?

Put another way, I am looking for cryptic and complex visual systems that maintain an internal logic (however faulty or suspect) and ESPECIALLY anything having to do with the interpretation and/or decipherment of such systems.
posted by mokujin on May 7, 2004 - 2 answers

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