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Jun
22
comment Can a file contain its md5sum inside it?
@Shadur: Yes, there is no function f such that, for each and every value X, f(md5(X)) yields X. However, there are many functions f such that, for at least one value X, f(md5(X)) yields X (the fixedpoint) -- CesarB already gives one example.
Jun
20
answered Is there a crypto system which detects decryption somewhere between sender and receiver?
Jun
19
answered What's a good way to trigger a hidden 'distress signal' in instant messaging?
Jun
18
asked Is there a standard for printing a public key as a barcode?
Jun
18
answered Is it safe to store a single symmetric key encrypted with several different RSA public keys?
Jun
18
awarded  Scholar
Jun
18
accepted Can a dictionary attack crack a Diceware passphrase?
Jun
18
answered Is a self signed certificate sufficient to prove the integrity of my executable?
Jun
17
awarded  Tag Editor
Jun
17
revised passwords wiki description
include the 3 KDFs actually mentioned in the top-rated answer
Jun
17
comment An alternative to traditional passwords: is there some merit to this idea?
@drjimbob: Yes, per-user salt and key stretching is the right thing to do, for exactly the reasons you mention.
Jun
17
suggested suggested edit on passwords tag wiki
Jun
14
answered Applying file deltas to an encrypted file
Jun
14
answered An alternative to traditional passwords: is there some merit to this idea?
Jun
13
awarded  Yearling
Jun
12
answered Applying file deltas to an encrypted file
Jun
3
comment Online Government Elections System - Is it possible?
@curiousguy: Are you asking "How do end-to-end auditable voting systems such as ThreeBallot avoid the kind of 'proof of vote' that could be used in vote-buying and coerced voting?" ? That would make a great separate question.
May
30
comment Online Government Elections System - Is it possible?
@curiousguy: ThreeBallot and other end-to-end auditable voting systems allow voters to prove their votes were counted, but without keeping the kind of "proof of his vote" that could be used in vote-buying or duress (3).
May
19
comment moving from MD5 to SHA-512
Option 3 is described in more detail at Upgrading User Password Hashes in Place
May
19
asked Are there a standard method(s) for me to give someone else read-only access to my data?