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I like crypto. Need I say more?


Nov
19
answered Difference between computational and statistical indistinguishabilities
Nov
19
revised Difference between computational and statistical indistinguishabilities
deleted 17 characters in body
Nov
15
comment Why do the outputs of parties in an MPC protocol have to be indistinguishable from the ideal / real world (as opposed to inputs)?
The reason indistinuguishibility implies security is that the ideal world is secure by definition.
Nov
15
comment Why do the outputs of parties in an MPC protocol have to be indistinguishable from the ideal / real world (as opposed to inputs)?
Likely the secret state of each party includes that party's input.
Nov
14
comment Elliptic Curve Encryption Ciphertext Size
Arent EC Elgamal and ECIES the same thing?
Nov
14
comment Why have 4th and 5th steps in Needham-Schroeder Protocol?
B could do that, but that is application specific. There are tons of applications out there were all we need is authentication with no further encrypted communications (e.g., electronic system where I prove to you who I am and you open a door for me). $N_b-1$ is the number $N_b$ minus one. If the random nonce $N_b$ is chosen to be $5$, A would encrypt and send $4$. If A can't decrypt, A can't get $N_b$ so A can't send $N_b-1$.
Nov
14
revised Scalar Multiplication on Elliptic Curves
added 11 characters in body
Nov
14
answered Scalar Multiplication on Elliptic Curves
Nov
14
revised Scalar Multiplication on Elliptic Curves
added 1 characters in body
Nov
14
revised Why have 4th and 5th steps in Needham-Schroeder Protocol?
deleted 79 characters in body
Nov
14
answered Why do the outputs of parties in an MPC protocol have to be indistinguishable from the ideal / real world (as opposed to inputs)?
Nov
14
answered Why have 4th and 5th steps in Needham-Schroeder Protocol?
Nov
14
revised Why have 4th and 5th steps in Needham-Schroeder Protocol?
added 208 characters in body
Nov
13
comment Why have 4th and 5th steps in Needham-Schroeder Protocol?
Can you tell us what protocol diagram you are looking at so we can all be on the same page?
Nov
12
answered How do I cryptanalyze a password field?
Nov
12
revised How do I cryptanalyze a password field?
added 45 characters in body
Nov
12
answered MD5 theoretical question
Nov
12
comment Does RSA work for any message M?
I agree. That said, just wanted to make you aware that SE does not notify downvoters when you edit. I'm assuming that is the reason why some have not changed their vote. Could be a nice feature though.
Nov
12
revised How do I cryptanalyze a password field?
edited tags
Nov
12
comment How do I cryptanalyze a password field?
Continued: is there an obvious block length? In other words, do the sizes of all ciphertexts have some common multiple (like 40 bits or 80 bits). If you can access many, many ciphertexts, what is the entropy? If the entropy isn't high, it might be an encoding scheme instead of encryption.