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Jul
15
comment AES-CBC pre-determined IV vs. null IV
Note that symmetric crypto means that key generators are possible. Using asymmetric keys only cracks but not key generators are possible, but they produce longer product keys.
Jul
14
comment how to implement order preserving encryption except cryptdb
Cryptdb is an implementation, not an algorithm. Are you really looking for an algorithm, or do you want an implementation? AFAIK cryptdb has an accompanying paper describing the algorithms it uses.
Jul
14
comment Why isn't outputting only a portion of the hash state a simple defense against length extension attacks?
That approach is secure. Perhaps there are even some SHA-3 candidates which use this approach, though I can't think of one.
Jul
14
comment Stern identification scheme to signature scheme
Related: Fiat–Shamir heuristic
Jul
14
revised Stern identification scheme to signature scheme
deleted 3 characters in body; edited title; edited tags
Jul
14
comment Requirements for the modulus in the Massey-Omura three pass protocol
I'd guess that it works like DH in that regard, you can use a shared public modulus, as long as it's big enough. 2048 bits or so.
Jul
13
revised Elligator-2 against curves over Fq, q mod 4 = 3
added 22 characters in body
Jul
13
comment Trying to understand the constant factors (19 and 38) in Ed25519 ref10 function 'fe_mul'
The order of the field is $p=2^{255}-19$. Sometimes it's convenient to reduce modulo $2p = 2^{256}-38$
Jul
12
revised How to compute two EC point multiplication?
deleted 3 characters in body
Jul
12
reviewed Reviewed Differential addition on Montgomery curve
Jul
12
revised Differential addition on Montgomery curve
added 2 characters in body
Jul
12
reviewed Reviewed Which concrete applications benefit from Oblivious RAM constructions?
Jul
12
revised Which concrete applications benefit from Oblivious RAM constructions?
added 998 characters in body
Jul
12
comment Which concrete applications benefit from Oblivious RAM constructions?
It'd be nice if you could include a short summary in your answer.
Jul
12
answered How to compute two EC point multiplication?
Jul
12
revised Does exponentiation by squaring work on Montgomery curves?
edited tags
Jul
12
comment How to compute two EC point multiplication?
The OP can define $*$ to mean whatever they want it to mean. They chose to define it as the solution of the CDH problem.
Jul
12
revised How to compute two EC point multiplication?
added 21 characters in body
Jul
11
comment Why Elliptic Curves?
Related questions: Why can ECC key sizes be smaller than RSA keys for similar security?, Trying to better understand the failure of the Index Calculus for ECDLP
Jul
11
comment How is an epsilon of 1/1000 non-negligible?
Consider an attacker who induces your client to send its password 1000 times. They'll be able to recover most of the password by combining the information learned from each transmission. This is similar to the attacks against RC4 in TLS.