Cryptography Weekly Newsletter

Cryptography newsletter

Top new questions this week:

128 bit 3DES Key and AES Key: what's the difference?

Apologies if this is really basic but I couldn't find the answer to this. I have heard some Info Sec colleagues talking about creating an AES key in preference to a DES or 3DES key but I don't know ...

aes  
asked by DST 3 votes
answered by fgrieu 8 votes

Is there a format preserving cryptographically secure hash?

I want a way to 'scramble' strings (like words, names) in a predictable way but I don't ever want to (myself or anyone else) be able to 'unscramble' the strings. I found that perhaps what I am ...

hash format-preserving  
asked by erotavlas 2 votes
answered by tylo 1 vote

AES as Integer Program

I read that AES can be broken by solving a Linear Integer Program (IP). From a given encrypted text, how can one construct this IP? How big is the system?

aes attack  
asked by user3613886 2 votes
answered by Robert NACIRI 0 votes

What is the advantage of using the socialist millionaire protocol to authenticate vs HMACing some random number?

Say Alice and Bob have a shared secret $s$. Alice and Bob establish an encrypted channel and verify that it hasn't been MitM'ed by exchanging $r_1$ and $r_2$, where $r_1$ and $r_2$ are randomly ...

protocol-design authentication  
asked by Peter Micheal Lacey-Bordeaux 2 votes
answered by poncho 2 votes

Recombination thresholds in degree reduction of multiplied Shamir shares

Shamir's secret sharing can be considered multiplicatively homomorphic, if one is aware of the fact that multiplying two shares of a (n,t)-threshold shared secret yields a share of the same secret, ...

shamir-secret-sharing threshold-cryptography  
asked by Rmn 2 votes
answered by mikeazo 1 vote

Is format preserving encryption suitable for use with words or names?

Is it possible to use FPE to encrypt names and language words like 'Bob' 'the' 'tree', in order to preserve both length and format (like keeping characters within a certain range like A-Z a-z) The ...

format-preserving  
asked by erotavlas 2 votes
answered by poncho 2 votes

What are the steps to decrypt a TLS 1.1 record?

My question is related to another question in Cryptography about TLS 1.1 and 1.2. I have read both RFC 2246 The TLS Protocol Version 1.0 and RFC 4346 The TLS Protocol Version 1.1. What I know is that ...

block-cipher ssl cbc initialization-vector  
asked by bookhuntress 2 votes

Greatest hits from previous weeks:

Difference between encrypting something and hashing something

What is the difference between encrypting something and hashing something? in what situations would I want one or the other?

encryption hash  
asked by Joel B 7 votes
answered by Thomas 6 votes

Why we can't implement AES 512 key size?

Out of curiosity why we can't implement AES 512 key size? Please explain somehow i can understand! I'm not an expert.

aes  
asked by hamedb71 2 votes
answered by fgrieu 14 votes

Can you answer this?

Is the half-homomorphic property of RSA a problem for blind RSA signatures?

For blind RSA signatures, is it problematic that RSA is half-homomorph? Take a scenario where blind RSA signatures are used for something like a voting procedure or this proposal: Lots of people, ...

rsa factorization blind-signature homomorphic-signatures  
asked by thejh 1 vote
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