Cryptography Weekly Newsletter

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Top new questions this week:

Verbatim of early work on public-key cryptography?

In late 1997, the history of public-key cryptography was turned around with the announcement by the CESG (April 2000 archive) that public-key cryptography was theorized in a 1970 note [1] by James ...

public-key history  
asked by fgrieu 5 votes

Gap problem for Learning With Errors

Informally, a "Gap" problem is the one that arises when solving the computational (or search) version using an oracle for the decisional version. For example, the Gap Diffie-Hellman Problem (GDH) is ...

provable-security lattice-crypto  
asked by cygnusv 2 votes
answered by mephisto 0 votes

what are multi-primes and how are they different from semiprimes?

I came to know of semiprimes recently. The simplest explanation of semiprimes is you take any two prime numbers and you multiply them, say 3*11 = 33 in which case 33 would be a semiprime. The numbers ...

encryption public-key multi-prime-rsa  
asked by shirish 2 votes
answered by poncho 4 votes

Are all binary-additive stream ciphers reciprocal?

I'm writing a thesis focused on Maurer's provably-secure stream cipher. Long story short, this cipher works by expanding a short key into a long keystream and then XORring this keystream with the ...

stream-cipher information-theory  
asked by whatyouhide 2 votes

What is the difference between order of base point and curve order in EC?

When I was read about the elliptic curve cryptography I found some definition about domain parameter of elliptic curve like the follow. But I did not understand something $p$: prime number. $a, b$: ...

asked by Mhsz 2 votes
answered by poncho 4 votes

Minimum number of independent trials needed to detect a bias

Suppose, I suspect that the probability of occurrence of a particular bit as $0$ is $.558$. Since, it is not $.5$, so this is possibly a bias. Now, my question is: What is the minimum number of ...

asked by pushpen.paul 1 vote

Elliptical curve cryptography key generation time

I am currently trying to learn more about Elliptical curve crypthography and have finally started to get things working and undestanding the different pieces. I've written a small project in C# and ...

asked by Johan O 1 vote
answered by poncho 3 votes

Greatest hits from previous weeks:

OTP from Sony BIOS password recover

From Dogbert's blog: Sony has a line of laptops ("Vaio") which compete mainly in the high value market segments. They implemented a master password bypass which is rather sane in comparison to the ...

rsa factorization  
asked by Paulo Scardine 2 votes
answered by yarek 1 vote

How to distribute session keys in public key cryptography?

In public key cryptography we can also use session keys which are symmetric. How do the sender (say a server) provides this session key information to its clients? If the sender (here server) ...

encryption public-key implementation ssl symmetric  
asked by Lunar Mushrooms 3 votes
answered by Will 5 votes

Can you answer these?

Less known hash functions producing 128 bit hash

Good day. While reversing a malware I stumbled upon a function producing 16 byte hash. I tried to determine which one is that by checking every function from wiki. Nothing fits. So, there are two ...

asked by fasmotol 1 vote

Can a secret message be securely transmitted within a MAC tag?

A sender wants to transmit an ultra secret code $M$ which could be either 'go', 'stop' or 'wait'. This could be any selection of code words really and adopted for any use such as transmitting short ...

encryption hash mac authenticated-encryption skein  
asked by ushadm 1 vote

Modes of encryption for hard drives?

What are the currently recommended modes of encryption for large disks? Basic requirements would seem to be that you can update an encrypted sector independently of others, which rules out most ...

encryption modes-of-operation disk-encryption  
asked by JT1 1 vote
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