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Jul
10
suggested suggested edit on Applying file deltas to an encrypted file
Jul
10
suggested suggested edit on How can I be sure Lastpass really can't access my passwords?
Jul
9
comment Is PBKDF2-based System.Cryptology.RFC2898DeriveBytes() “better” for Unicode Password hashing than traditional methods?
related: Does NIST really recommend PBKDF2 for password hashing?
Jun
27
comment Using passwords made of words
possible duplicate of Can a dictionary attack crack a Diceware passphrase?
Jun
23
comment Is it safe to store a single symmetric key encrypted with several different RSA public keys?
related: security.stackexchange.com/questions/8720/…
Jun
23
comment Save private messages encrypted in database
related: security.stackexchange.com/questions/12205/…
Jun
22
awarded  Critic
Jun
22
comment Can a file contain its md5sum inside it?
@CesarB: Could you edit your answer to emphasize that it is almost certainly theoretically possible to "create a file that contains its md5sum inside it", even though it is practically impossible with today's technology? For any one given postfix, we have a 63% probability that such file is possible; for any 7 different given postfixes, we have a 99.9% probability that such a file is possible for at least one of those postfixes. Since there are an infinite number of possible postfixes, it's almost certain that millions of different postfixes have at least one md5 fixed point.
Jun
22
awarded  Commentator
Jun
22
comment Can a file contain its md5sum inside it?
@CesarB: Could you edit your answer to emphasize that it is almost certainly possible to "create a file that contains its md5sum inside it" -- for any one postfix, we have a 63% probability that one "merely" iterates through all possible postfixes (of where there are an infinite number)
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