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6
votes
1answer
4k views

Will double encryption increase the security of cipher vs bruteforce?

Assume I have a function encrypt(mes,key) where mes is the message, and key is the key. The length of key is 64 bits. Last but not least: assume the only way to crack my cipher is a brute-force ...
1
vote
1answer
454 views

Nowadays, what is the difference between Cyber Security and IT Security? [closed]

Lately (and not so lately), you can hear a lot about cyber security. It is really hard to find an official description about this matter so, let's take the ISO 27032 description: "Cybersecurity” ...
4
votes
1answer
56 views

Principles of memory forensics tools

I am currently writing a thesis about digital forensics which includes a chapter about memory forensics. Besides the tools and the methods of acquiring various data with them, I am kind of desperate ...
3
votes
1answer
68 views

How long do HTML password fields (sent to the server as postdata) remain in memory?

In any major server-side web framework, there is usually a mechanism to read HTML form input, e.g. in ASP, for an HTML element, <input type="text" name="the_field" />, it is ...
40
votes
2answers
8k views

Amount of simple operations that is safely out of reach for all humanity?

Cryptographic primitives usually assert some security level given as number of operations to mount an attack. Hash functions, for example, give different security levels for collision attacks, ...
1
vote
1answer
68 views

Any known protocol for establishing trust between an inherently untrustworthy source and a server without a 3rd party?

Is there any kind of protocol, scheme, or theoretical paper out there that implements or examines the problem of establishing trust between two parties (communicating, listening) where the ...
4
votes
3answers
339 views

Fully encrypted social network theory

I have this idea about building a social network that stores all its data encrypted. The idea is that a member's data is stored on multiple 'base servers' (of the member's choice). Each member has 3 ...
25
votes
7answers
12k views

Where can I learn cryptography/cryptanalysis the hard way, without going to school ? Any good book?

I'm not so bad at mathematics: I know what are p-list and p-combinations, I know matrix algebra, I know what a XOR is, I know how to tell if number is a prime, etc: I'm not the programmer who hates ...
15
votes
4answers
1k views

Future proof encryption possible in theory?

Let's say I have a message that I want to keep safe for the next 100 years. Is it theoretically possible? Let's say the message is unique (raw picture data, raw video video data, raw text data) and ...
1
vote
4answers
317 views

Strategies to store/remember very long password?

If future proof encryption is - in theory - possible it will require long password. What are some of the strategies for storing or remembering very long - in this case rarely used - password? For ...
8
votes
2answers
226 views

What applicability does the Halting Problem have to infosec?

I was reading an infosec blog recently, and I was caught off guard by the following statement: Sure you can run up to date software and firewalls and that network appliance in your data center ...
4
votes
1answer
224 views

How big is the risk of hash fixed points/cycles?

It's established wisdom to hash password multiple times with a salt to increase the time it takes per brute force iteration. At the same time (unless the algorithm guarantees otherwise) there's a ...
5
votes
4answers
308 views

provable security and sandboxes

Maybe this can be answered by an answer to a more general question, such as what programs can be proven secure. Can it be (or has it been) formally proven that a sandbox is secure?
25
votes
5answers
2k views

How valuable is secrecy of an algorithm?

On the surface, the inadvisability of security through obscurity is directly at odds with the concept of shared secrets (i.e. "passwords"). Which is to say: if secrecy around passwords is valuable, ...
0
votes
1answer
295 views

Detecting end-state of decryption process with unknown key

Note: this question arises purely from a theoretical interest in security research. Frequently in popular fiction we see white-hat hackers decrypt secret information in a matter of seconds. While ...
1
vote
1answer
711 views

authorization vs federation vs entitlement

I am vague among the three following terms: authorization, federation, entitlement (as stated by the OpenAM product: OpenAM provides open source Authentication, Authorization, Entitlement and ...
1
vote
2answers
448 views

BLP Lattice structure with missing top and bottom levels

I designed a system similar to the above diagram. However There is no (Top Secret, {nuclear,crypto}) and no (Secret,{}) levels. Meaning that there is no top and bottom level. Would it make the BLP ...
1
vote
1answer
156 views

Appilicability of Theoritical Computer Science/Formal methods in Malware research

I would like to know the importance of Theoritical CS/Formal methods in Malware research. Due to the large volume of new malware variants received per day (~50,000 samples/day according to McAfee), ...
14
votes
2answers
972 views

Are there some good papers (or discussions) on using Markov chains or Hidden Markov Models for password auditing/cracking?

As a programmer and language enthusiast I've been very interested in Markov chains for some time. Considering the influence of natural language on password and passphrase selection (by humans of ...
4
votes
1answer
59 views

Are viewable permissions an issue?

Is it, generally, considered to be a security issue if a user in 3-tier application has read-only access to other users' permissions? I.e. Alice can see that Bob has or has not access to some ...
6
votes
1answer
704 views

Open Problems in Security?

I know it might seem a bit too much theoretical, but I was wondering if there was some list of known open problems in security? In a similar way that there are open problems in Theoretical Computer ...
8
votes
7answers
2k views

Definition of Software Security

I'm looking for a theoretical definition of Software Security. And I need to quote some book in an article. Most of the books starts already assuming that the user knows what that is, and they're ...
4
votes
2answers
141 views

Is it correct to consider audits as exclusively “detective” in nature?

I'm studying for the CISSP exam and one of the video lecture points didn't quite make sense to me. The instructor was discussing access control administration areas and began categorizing certain ...
6
votes
4answers
357 views

What is the solution to Schneier's Law?

Schneier's law (which should probably be called Babbage's Law). States that: Anyone, from the most clueless amateur to the best cryptographer, can create an algorithm that he himself can't ...