1,241 reputation
722
bio website ethanheilman.tumblr.com
location Cambridge, MA
age 31
visits member for 3 years, 1 month
seen Aug 14 at 3:52

Nov
22
comment Could one construct a cipher that is secure for friendly parties to use but insecure for hostile parties?
@user11342 Where did your answer get moved? I can't seem to find it.
Nov
2
comment How to deduce enigma settings given a partial plaintext?
Yeah, my bad, I redid my calculations and ended up with the same answer as you.
Oct
28
comment How to deduce enigma settings given a partial plaintext?
Nice try, time traveling Alan Turing.
Oct
12
comment Why has the RSA factoring challenge been withdrawn?
Thanks Thomas! Someone should turn this into a question.
Oct
12
comment Why has the RSA factoring challenge been withdrawn?
According the wikipedia page: "[TWIRL'S designers] estimate that if TWIRL were built, it would be able to factor 1024-bit numbers in one year at the cost of 'a few dozen million US dollars'". Is this statement incorrect? Has something new been learned?
Oct
12
comment Why has the RSA factoring challenge been withdrawn?
What about research on custom cryptanalysis hardware such as TWIRL en.wikipedia.org/wiki/TWIRL
Sep
30
comment What is the “Random Oracle Model” and why is it controversial?
+1 for "There is a black box. In the box lives a gnome, with a big book and some dice."
Sep
29
revised Is there a secure cryptosystem that can be performed mentally?
added link to attacks on the Pontifex cipher
Sep
29
suggested suggested edit on Is there a secure cryptosystem that can be performed mentally?
Sep
28
comment Is there a secure cryptosystem that can be performed mentally?
OTP's can be done mentally, would you consider OTPs a fair answer?
Sep
28
revised How does HOTP keep in sync?
tex notation, links to wikipedia
Sep
28
suggested suggested edit on How does HOTP keep in sync?
Sep
28
revised How to attack a classical cipher using known partial plaintext?
reworded, formatting, links
Sep
28
suggested suggested edit on How to attack a classical cipher using known partial plaintext?
Sep
28
revised How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
links to wikipedia
Sep
28
revised How to enhance randomness of AES?
changed notation to tex notation
Sep
28
suggested suggested edit on How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
Sep
28
suggested suggested edit on How to enhance randomness of AES?
Sep
28
comment Time Capsule cryptography?
@IlmariKaronen - Thanks, updated the link. I agree completely, an attacker could run a sequencing side-channel attack against the message. I said the same thing here: the-scientist.com/2011/09/26/encrypting-e-coli . Most security systems are built around models of what an attacker can do. For example AES can be broken by a timing side-channel, but that doesn't mean AES is no longer secure. Furthermore there are some pretty powerful countermeasures that could be used prevent to a sequencing side-channel attack.
Sep
28
revised Time Capsule cryptography?
link was broken