Willem Hengeveld

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103 reputation
12
bio website xs4all.nl/~itsme
location Netherlands
age
visits member for 2 years, 5 months
seen 2 hours ago

Hacker, programmer, reverse engineer. Currently mostly programming in c++, python and perl, using boost + STL c++ libraries a lot. Enjoy reverse engineering, and patching basebands. Wrote tools for hacking on windows mobile devices, unpackers for many rom filesystems. Fast searching tools for bitcoin blockchain. Often using IDA to investigate binaries.


Aug
13
awarded  Enthusiast
Aug
10
comment What does well-typed mean?
see Intuitionistic type theory or Simply typed lambda calculus
Aug
3
comment point addition equation in projective co ordinates
I found this, a database of curve equations, with all possible addition formulas. not your curve though.
Jul
20
comment Can a EC private key be derived from a public key?
d+q for 0<d<2^n-q gives the same pubkey as d.
Jul
18
awarded  Editor
Jul
18
revised How to calculate complexity of ElGamal cryptosystem?
improved layout of code sample
Jul
18
suggested suggested edit on How to calculate complexity of ElGamal cryptosystem?
Jul
15
comment Why use $(r,s)$ instead of $(r,s^{-1})$ as DSA signature?
The signature verification involves two elliptic curve multiplications, which take way more time than the modular division, so there is not really a point to precalculate this.
Jul
15
awarded  Supporter
Mar
20
comment Order Preserving Encryption for Numeric Data Values
If the list of messages is static, you could of course just prepend the indexnumber of the message to the encrypted message.
Mar
20
comment Order Preserving Encryption for Numeric Data Values
you probably don't need the have the numerical encrypted values ordered, but it would suffice if you had some function f: f(E(m1), E(m2)) = m1<m2