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Dec
27
comment Why would an Initialization Vector be supplied externally?
I think if the caller of that library has to know the details of CBC to use it with larger plaintext, it is not abstracted enough. It should provide a stream-like API, where the caller can pass chunks of data in several steps, and the stream takes care of the details.
Dec
26
comment how to let other people respond to emails only decrypt-able with my private key
Do you have some examples of (public key) encryption schemes which allow this (with a reencryption key which is not just the pair $(d_A, e_B)$, i.e. decryption followed by encryption)?
Dec
26
revised how to let other people respond to emails only decrypt-able with my private key
typos
Dec
22
comment Find private exponent in RSA
@Mac The $1/e$ means the multiplicative inverse of $e$ modulo $\phi(n)$ (i.e. in $\mathbb Z/_{\phi(n)\mathbb Z}$), not the inverse in $\mathbb{Q}$ (or $\mathbb{R}$ or your computer's floating point numbers).
Dec
22
revised Find private exponent in RSA
formatting
Dec
21
revised How can a cryptosystem be unconditionally secure?
make the image a link
Dec
20
comment Is it safe to AES-CBC and AES-CMAC both using the same key?
@binta I did think this too, but the effective IV here is not the predictable "last 16 bytes of previous ciphertext", but the AES-encryption of those, which should not be predictable by an attacker, assuming no time-rollback.
Nov
27
comment Diceware word list for six dice
@Ed: I'm not sure that there are that many "relative easy words" in any language.
Nov
18
comment Is it possible to determine a PGP public key from encrypted data?
@Ricky I have to concur to e-sushi's comment ... could you write at least some excerpt of that answer here, maybe with some emphasis on the crypto-related stuff?
Nov
17
awarded  Enlightened
Nov
17
awarded  Nice Answer
Nov
17
revised How does GPG verify succesful decryption?
fix typo
Nov
10
revised What does $\mathbb Z_p^*$ contain?
formatting, better tag
Nov
10
comment Opinion on my idea for storing credit cards securely
Welcome to Cryptography Stack Exchange. How would a user "provide his private key"? I guess usual users can memorize their credit card data easier than they can memorize a private key.
Nov
7
revised What is the value of Q such that Q|P-1 where P is a prime number?
edited tags
Nov
7
comment Crypto-Compression Algorithms?
@Habib: The size of the message space doesn't change by compression, assuming you are using lossless compression (i.e. compression which can be reverted). You just change the encoding of it to a form which is on average shorter.
Nov
4
revised Why to try get key out of white box crypto? How can one protect WBC itself?
formatting
Nov
2
comment How to figure out the size of the output of a cryptographic checksum function
Welcome to Cryptography Stack Exchange. It looks like your question is actually to be answered in exercise 20 – the text before it doesn't really explain it.
Nov
2
revised How to figure out the size of the output of a cryptographic checksum function
formatting
Nov
1
revised How can a good pseudo-random number generator be made?
typos, formatting