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Mar
25
answered Does perfect secrecy imply uniform ciphertext distribution?
Mar
25
comment Cycles in SHA256
The identity function is a permutation for which one would get $\: n = 1 \;$. $\;\;\;\;$
Mar
23
revised credit card number encryption using aes-ctr mode
improved grammar and changed spacing
Mar
22
revised How are RSA and ElGamal compatible in PGP?
fixed grammar and improved spacing
Mar
21
comment Is this an example of a zero knowlege proof?
What do you think would be a simulator for the adversary that $\hspace{2.49 in}$ generates messages just like an honest verifier? $\;$
Mar
21
answered Coding of unsigned int to prevent guessing next ID
Mar
21
comment Is it safe to prefix the a key with a known value?
It looks like HMAC can even use any bit-string as a key. $\;$
Mar
20
comment HMAC tag to verify the key (verification in the reverse direction)
Universal hash families provably achieve your goal. $\;$
Mar
18
comment Applying Trapdoor Function directly to plaintext
@Nova : $\;\;\;$ My "attack also works with a hashed input", however, I don't see why that makes the scheme mentioned in hvuong91's comment at 04:45:27Z insecure. $\:$ (Is "his/her mentioned scheme" different from that one?) $\;\;\;\;\;\;\;\;$
Mar
18
comment Applying Trapdoor Function directly to plaintext
@Nova : $\;\;\;$ Perhaps, but in any case, I hadn't noticed that comment. $\:$ "Why does" what "become insecure if we don't do that"? $\;\;\;\;\;\;\;\;$
Mar
18
comment Applying Trapdoor Function directly to plaintext
@Nova : $\:$ No, hvuong91 didn't say that hashing was the alternative. $\;\;\;\;$
Mar
18
comment Applying Trapdoor Function directly to plaintext
@Nova : $\:$ The eavesdropper would first hash candidate before using the trapdoor function. $\hspace{.69 in}$
Mar
18
comment Applying Trapdoor Function directly to plaintext
I just did that. $\;$
Mar
18
revised Applying Trapdoor Function directly to plaintext
gave a simple example
Mar
18
comment Making PRFs out of PRGs
Do you mean $\: n\cdot 2^{\hspace{.02 in}n} \;$? $\;\;\;$ (Instead of $\: n.2^n \;$.) $\;\;\;\;\;\;\;\;$
Mar
18
answered Applying Trapdoor Function directly to plaintext
Mar
17
revised Reusing a one-time pad?
fixed title's spelling
Mar
17
revised Can we reverse a hash when we know part of the input?
fixed two typos
Mar
13
comment Attack on key exchange with authentication
Is "it" the random k or H(pk) or pk or the ciphertext resulting from encrypting the random k with H(pk)? $\hspace{.23 in}$
Mar
13
comment Attack on key exchange with authentication
"read it off to Alice", where "it" is ... $\;$