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Results tagged with cryptanalysis
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user 64
Analysis of individual security aspects of a cipher or algorithm, not the security of a cipher or algorithm in general (which would lean towards “algorithm-design”).
2
votes
Where can I find useful data for cryptography/coding theory?
If you use a high-level mathematical language (Mathematica, Maple, etc.), generating this data is very easy. I use Mathematica personally, but some are free and apparently very good.
In a pinch, you …
- 8,717
7
votes
Accepted
Can you help with that definition for a CCA?
In step 2, the adversary outputs two messages. One of these will be selected at random for encryption. You can think of the adversary sending these messages to a "challenger" that also has oracle acce …
- 8,717
2
votes
For public-key encryption, why does COA resistance imply CPA resistance?
I have a definition of COA-security in my head but I cannot find this definition (applied to public key cryptography) in the literature or reference books.
Under it, textbook RSA is an example of a …
- 8,717
16
votes
Definition of textbook RSA
RSA is both an encryption and signature function. I have heard the term "textbook RSA" used mostly with the encryption function, but the same basic principle applies to RSA signatures as well. It is e …
- 8,717
6
votes
Accepted
Is there some way to generate a non-predictable random number in a decentralised network?
A service that provides such numbers is called a random beacon.
Since everyone has to agree on what a beacon's value is and peers may not have a complete view of the network, it is very difficult to …
- 8,717
11
votes
How to attack a classical cipher using known partial plaintext?
I do not have a solution, but I pursued the cipher long enough to establish it wasn't one of the easy classical ciphers. This approach should get you started.
The first thing you want to do is conver …
- 8,717
40
votes
Are there two known strings which have the same MD5 hash value?
A new result shows how to generate single block MD5 collisions, including an example collision:
Message 1
Message 2
> md5sum message1.bin message2.bin
> 008ee33a9d58b51cfeb425b0959121c9 message1.bin
> …
- 8,717
6
votes
Accepted
How to forge Schnorr signatures if you can guess the challenge
In the other answers, you'll find how to simulate a proof if you know $e$. This answer is meant to provide some "color commentary" on the other answers. It is a companion piece.
Notation
In step 1 …
- 8,717