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Sep
1
comment How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
Yes, this is a good question. Everyone should have this question. The fact that nobody has a good answer is an important fact and it is good to publish the question on this site. A lot of the most important questions around don't really have solid answers. Uncertainty and ignorance are what we have to face up to and decide how to manage.
Sep
1
comment What is the post-quantum cryptography alternative to Diffie-Hellman?
Not for the key agreement that you asked for, but for digital signatures, please see my answer to a previous related question.
Aug
17
answered Are these emerging threats against AES affecting your designs?
Aug
6
answered UMAC: to what extent is it in use today?
Aug
4
answered Guarding against cryptanalytic breakthroughs: combining multiple hash functions
Aug
3
answered Reduction from signatures to encryption?
Aug
2
awarded  Beta
Jul
17
revised Is key size the only barrier to the adoption of the McEliece cryptosystem, or is it considered broken/potentially vulnerable?
added 247 characters in body
Jul
17
answered Is key size the only barrier to the adoption of the McEliece cryptosystem, or is it considered broken/potentially vulnerable?
Jul
17
awarded  Editor
Jul
17
revised Is it feasible to build a stream cipher from a cryptographic hash function?
added 180 characters in body
Jul
17
awarded  Teacher
Jul
17
answered Is it feasible to build a stream cipher from a cryptographic hash function?
Jul
17
answered Reduction from signatures to encryption?
Jul
13
awarded  Precognitive
Jul
13
awarded  Supporter