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location Netherlands
age 40
visits member for 3 years
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Security professional with many years of experience with the practical application of cryptographic algorithms and protocols. I'm helping with the design of protocols and API's within international standardization bodies. Lead developer of a common criteria certified product. Over 30 years of general experience with computers.

On crypto I mainly answer less mathematically inclined questions, leaving security proofs to the theoretical cryptographers and analysts.


16h
comment Are there any standards of multi-prime RSA key generation?
I guess the answer has to be "apparently not" but that's pretty useless as an answer.
1d
comment Finding Elliptical curve points and encoding text using them
Encrypting a hash sounds like ECDSA to me...
1d
comment Finding Elliptical curve points and encoding text using them
Community wiki because of (2). Feel free to edit.
1d
answered Finding Elliptical curve points and encoding text using them
1d
comment best scheme hash function for block cipher?
You are asking a subjective question here. Define what properties you are after. Asking for "the best" of anything is begging for down votes and close votes.
1d
comment How to establish if a string contains a message
Edited question, but I don't know how to get the ~⩬ operator in TeX format, so if anybody knows how to do that, please don't hesitate.
1d
revised How to establish if a string contains a message
formatting
1d
revised Repeatedly using same key on different plaintexts
rewritten , same conclusion
2d
comment Using Diffie-Hellman key to establish a shared key $K_{AB}$
That's great cryptoclk, but as you can see this is a Q/A site and your Q is lacking a Q. Checking your homework is not interesting for anyone but you.
2d
comment How secure is AES-256?
I think I'm over 50 ciphersuites in my implementation (just an enum, no I'm not going to implement them all). "decrypt all standard encryption such as SSL" is in itself a wrong statement. SSL is a protocol with a large set of possible underlying algorithms.
2d
comment Using Diffie-Hellman key to establish a shared key $K_{AB}$
It's fine if you have explicit questions cryptoclk, but this Q/A site is not here to verify your homework.
2d
revised Maximum length in bits of the product n=pq
deleted 1 character in body
2d
comment Maximum length in bits of the product n=pq
Perfect, thanks! Cannot vote up more though :)
2d
comment RSA OAEP: prevention of partial decryption of ciphertexts
Note: I've substantially edited the question above to make it at least legible. If anything is not clear, please take a look at the initial question by clicking on the time of the last edit.
2d
revised RSA OAEP: prevention of partial decryption of ciphertexts
deleted 237 characters in body; edited title
2d
comment Maximum length in bits of the product n=pq
As we are clearly talking about RSA here, it would be nice to explain how $n$ is set to be exactly the key size during key pair generation - obviously that does not lead from the $pq$ calculation in itself.
2d
revised Maximum length in bits of the product n=pq
added 1 character in body; edited tags
2d
comment Maximum length in bits of the product n=pq
You are assuming a least significant bit of zero for two (large) prime numbers? Which one of them is even?
2d
comment Maximum length in bits of the product n=pq
Partial answer at best, there were two related questions.
2d
comment Maximum length in bits of the product n=pq
Partial answer at best, there were two related questions.