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2d
comment Factorize RSA knowing several N and E
There's a good piece of software at factorable.net that can compute the GCD of several couples of integers at the same time
2d
comment Can you explain Bleichenbacher's CCA attack on PKCS#1 v1.5?
A new link for the original paper archiv.infsec.ethz.ch/education/fs08/secsem/… (link in the answer gives a 404error)
Jul
25
awarded  Yearling
Jun
25
awarded  Caucus
Jun
25
awarded  Constituent
May
28
comment How to decrypt a PGP message with only the two primes and the public exponent?
You can use a python library to build up your key from the information you have.
May
27
comment Why don’t all AES encryption tools produce the same key from the same password?
You missed a point. AES is a standard. Encryption is not defined with a password but with a key. So you must derive a key from you password. Give a look PBKDF.
May
27
comment Why don’t all AES encryption tools produce the same key from the same password?
Encryption should not be deterministic. There is also a random value, called initialization vector (IV) that is used to randomize the output. It is added to the ciphertext and it is used during the decryption process too. For this reason using different software (but even encrypting twice under the same software) you get different ciphertexts. By the way if the algorithm and the mode are correctly implemented, no matter what software Bob is using, he will definitely decrypt Alice's message.
May
27
comment Why don’t all AES encryption tools produce the same key from the same password?
this question looks like a homework question. Do you want we do it for you?
May
11
comment ECC vs RSA: how to compare key sizes?
you can find something here (3 links): gnupg.org/faq/gnupg-faq.html#no_default_of_rsa4096 certsimple.com/blog/measuring-ssl-rsa-keys crypto.stackexchange.com/questions/8687/…
Mar
3
comment AES as Integer Program
If I am correct, every symmetric algorithm can be described by a system. The problem is the whole system is too much big to be solved.
Feb
23
reviewed Close Hill Cipher the point of a known plaintext attack question
Feb
20
comment LUKS multiple key slots - what's the intuition?
Actually in general some related keys attacks exists but it is very unlikely for this context.
Feb
19
revised LUKS multiple key slots - what's the intuition?
added 119 characters in body
Feb
19
comment LUKS multiple key slots - what's the intuition?
Nope. Under the hypothesis that the encryption scheme used to encrypt the MasterSecretKey is secure. A standard encryption scheme does not leak any information about the plaintext if it is encrypted under multiple and different keys.
Feb
19
answered LUKS multiple key slots - what's the intuition?
Jan
19
awarded  Custodian
Jan
19
reviewed Close How many bits of entropy would I get from 300 coin tosses?
Jan
14
comment Programming language for modular arithmetic over large numbers
This question is not on topic here. By the way programming languages as python, ruby and many others have a inbuilt support for big numbers arithmetics. If you want still stick to C/C++ you can easily use a bignumber library (gmp for example)
Jan
12
revised Where are the ChaCha20 test vectors/examples?
added 217 characters in body