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I'm an engineer with experience in applied cryptography, in particular in Smart Card systems.


Nov
21
comment Python. RSA common modulus attack problem
Use Extended Euclidian to compute modular inverse. That maybe what gmpy.invert does.
Nov
21
revised Verbatim of early work on public-key cryptography?
Expand description of Simon Singh's writing
Nov
21
revised Verbatim of early work on public-key cryptography?
Add quote of [6]
Nov
21
revised Verbatim of early work on public-key cryptography?
Add new reference [6], and better link to the FoIA case
Nov
21
revised Is there a way to systematically calculate the public exponent $e$ in RSA?
fix another OB1, polish
Nov
21
revised Which attacks are possible against raw/textbook RSA?
More interesting example
Nov
21
revised Which attacks are possible against raw/textbook RSA?
Add Leak of Jacobi
Nov
21
revised Verbatim of early work on public-key cryptography?
typo
Nov
21
comment Hash collision using the leading 40-bits of SHA-1
Your problem seems to be that only the cmp_hashhash step is reduced to 40 bits; assuming hash.CalculateDigest is SHA-1, the function that you iterate is 160-bit, and does not enter a cycle in a reasonable time. Change steps involving hash.CalculateDigest to truncate to 40 bit (perhaps just by changing 20 to 5), and see the magic of the birthday bound.
Nov
21
revised Verbatim of early work on public-key cryptography?
Widen last question
Nov
21
revised Verbatim of early work on public-key cryptography?
typo
Nov
21
revised Verbatim of early work on public-key cryptography?
Expand on the significance of the discrepancy
Nov
21
revised Verbatim of early work on public-key cryptography?
Link to Simon Singh's writing
Nov
21
revised Verbatim of early work on public-key cryptography?
Link to FOIA case
Nov
21
revised Verbatim of early work on public-key cryptography?
Quote sources of [5]; ask for its story.
Nov
20
comment Are all binary-additive stream ciphers reciprocal?
@whatyouhide: Welcome to crypto.SE! $\;$ Looks like you are doing fine; I do not spot that you wrote anything silly in question or comment.
Nov
20
revised Calculate the security of a cascade cipher
fix typo
Nov
20
revised Is there a way to systematically calculate the public exponent $e$ in RSA?
Fix an OB1
Nov
20
asked Verbatim of early work on public-key cryptography?
Nov
20
revised Is there a way to systematically calculate the public exponent $e$ in RSA?
Justify the PKCS#1-conformant method