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Apr
27
awarded  Good Answer
Apr
26
awarded  Enlightened
Apr
26
awarded  Nice Answer
Apr
25
answered If you hashed a hash an infinite number of times would you end up with a unique hash?
Apr
15
awarded  Nice Answer
Apr
13
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Apr
7
comment How can rainbow tables be used for a dictionary attack?
@FredericoSchardong: see this article for some thorough analysis. It is not an easy read. Informally, when you build rainbow/Hellman tables, you accumulate chains with distinct end points; the more chains you insert, the higher the probability that the next chain merges with one already in the table, and thus was lost CPU. At some point it no longer is worth it; you'd better start a new table. The "1.7" factor comes from that effect.
Apr
3
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Mar
23
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Mar
22
answered Is it safe to encrypt data by simply randomizing chunks based on a permutation?
Mar
20
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Mar
19
awarded  Enlightened
Mar
19
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Mar
11
comment RFC 6979 - Why not simply hash the message & the private key for deterministic ECDSA?
In their article, the EdDSA authors mostly say that: "Standard PRF hypotheses imply that this pseudorandom session key r is indistinguishable from a truly random string generated independently for each M, so there is no loss of security". This is a bit too terse to be called "extensive analysis" but it makes sense. For more analysis, you may read the Leurent & Nguyen article cited from RFC 6979 (under the reference "LN2009"); that article includes some analysis and pointers.
Mar
10
awarded  Revival
Mar
10
answered RFC 6979 - Why not simply hash the message & the private key for deterministic ECDSA?
Feb
28
awarded  Nice Answer
Feb
27
answered Are there any known weaknesses with ElGamal algorithm?
Feb
13
reviewed Edit Can we say that if $P=NP$ there is no CPA secure public key encryption?
Feb
13
revised Can we say that if $P=NP$ there is no CPA secure public key encryption?
not a critical change.