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  1. C

    Dead harddisks?

    Thanks for the replies. I will just see if the disks works with a new PCB, in which case the RAID array should work as well. I assume that either all data can be read or no data can be read, in which case I have to use the backup. The RAID controller does not care how the discs are connected...
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    Dead harddisks?

    There have been no thunderstorms here in the last few weeks. I had another computer running at the same time on the same wall outlet, and that just kept on running when the other computer suddenly turned off. However, it is a small ITX motherboard with an external 12V PSU, so that might have...
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    Dead harddisks?

    They are definitely fried. One of them does not show any sign of damage, but I just tried removing the PCB on the second drive, and I immediately recognized the smell. A chip on the PCB (SMOOTH L6284) has was black on one side, and had scorched the PCB as well. I assume that the second drive...
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    Dead harddisks?

    Western Digital WD5000KS
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    Dead harddisks?

    Last night my computer suddenly turned off all by itself. I tried to start it again, but nothing happened. I disconnected everything except the ATX power connector and the system turned on, although I didn't even get into BIOS. I found out by trial and error that if I didn't connect the 8 pin...
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    Java question

    While Java has some special means of communication for different purposes (for example Remote Method Invocation (RMI)) most communication is done over TCP or UDP sockets. Here is doesn't matter on what platform the process in the other end runs on. If a reply is not received over the socket in a...
  7. C

    Primes in P

    No, I haven't stated what the running time of the probabilistic algorithm for primality testing is, but if it fails with probability 1/2 on a composite number, running the algorithm X times the probability that it will still accept a composite number as a prime is (1/2)^X. As you can see X needs...
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    Primes in P

    And just to clarify: The paper describes an algorithm for determining if a number is prime or not without factoring the number, and it does so in polynomial time. Previously we only had algorithm that would output either: Not a prime (and you could be sure that the number wasn't a prime) or it...
  9. C

    Can the system datalinks be hardware encrypted?

    RSA is an encryption algorithm, but is normally used to encrypt a small piece of random data to be used as a key for a faster conventional algorithm since RSA is extremely slow. You were probably thinking of the Diffie-Hellman key exchange protocol which is used only for exchanging keys. Given...
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    Can the system datalinks be hardware encrypted?

    RC5 and 3DES are not related to the factoring of large numbers. Still your point is valid. I don't see algorithms like 3DES, Rijndael, Mars, Serpent, RC5, RC4, RC6, IDEA, CAST, etc... being broken in the near future (if ever). That was my point. Of cause you could look into the chip to read out...
  11. C

    Can the system datalinks be hardware encrypted?

    Sure you could implement an encryption algorithm in hardware and integrate it into the CPU or any other chip that needed to communicate securely. The problem is that you need to store the key somewhere, and having to actually make the key a part of the chip would probably be very expensive since...
  12. C

    Quantum Computing...

    It's funny what people call a one time pad. The one time pad is what was described earlier: Choose a completely random bitstring where each bit is choosen with probability 0.5 and independant of each other, then XOR that bitstring with the plaintext. It's easy to prove that this gives an...
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    Quantum Computing...

    I have no idea where to start, but having taken courses in complexity theory, quantum computing, cryptography, cryptologic protocols and quantum information theory I guess I am expected to contribute to this thread. First the interesting topic of how fast a quantum computer is. The answer is...
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    Algorithm Complexity Analysis

    Well, because binary representation is the only way to encode som instance of a problem on a computer the most accurate results are given by considering the length of the binary input string. A computer will work on the binary representation and the longer it is the more time it will take...
  15. C

    Non-determinism, Polynomial time problems and NP-complete

    << Actually it is unknown whether Quantum Polynomial is equivalent to non-deterministic polynomial time. Factoring and Discrete Log are in Quantum Polynomial time -- though neither are known (or believed to be) NP-hard problems. >> Ok, I was not being very specific. Here are some results from...
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    Non-determinism, Polynomial time problems and NP-complete

    << Quantum computers are effectively non-deterministic machines. >> There are elements of non-determinism in a quantum computer, but not the same as we think of regarding a non-deterministic turing machine. That is also supported by the fact that a quantum computer can't solve NP-Complete...
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    How often you format?

    3-4 times a year I guess
  18. C

    BIOS Checksum Algorithm, anybody know? ( Peter where are you?)

    You are right in saying that such a checksum is not possible unless the BIOS file consists of four byte blocks such that the sum of the bytes in each block is the samen (which would severely limit the kind of data you could store in the bios file). You are actually saying that there exist two...
  19. C

    BIOS Checksum Algorithm, anybody know? ( Peter where are you?)

    I don't really understand the scheme you are describing, but here are some possibilities. I have seem the following simple checksum values used: - Sum all bytes in the file (except the checksum of cause) modulo 0x10000 and put the result in the last two bytes of the file. - Same as above put...
  20. C

    linux kernel install problems, please help i am gonna go crazy

    I haven't checked recently but I believe that support for the 440mx should be added by now (they were working on it in year 2000). I think that the chipset being detected as a bx is your problem. Also, if anything is compiled as modules you forget to do a make modules make modules_install...
  21. C

    How does a computer generate a random #?

    Intel have implemented a RNG in some of their chipsets and CPUs. They can be used in combination with other methods to generate better seeds. They have absolutely nothing to do with quantum mechanics.
  22. C

    How does a computer generate a random #?

    I will not go into discussing quantum computing and quantum encryption in detail since I have done that a few times before on this board. I will just point out that it's a common misunderstanding that quamtum computers can be used to break all encryption. Let's look at what they can actually do...
  23. C

    How does a computer generate a random #?

    As many people have said computers can't generate a truely random number on their own. Normally you use pseudo random number generators which can be thought of as a big cycle of numbers (or a function that you can use to always get the next number in the cycle). Then you get some truely random...
  24. C

    Is RAID 0 slower than a single drive configuration?

    I have a 3Ware Escalade 6200 RAID card. In RAID0 with two disks it beats a single disk in all read tests, but in write tests it's almost 3 times slower than a single disk. I have no idea why, but from what I have read on the newsgroups this is a common thing with some 3ware cards. If anyone have...
  25. C

    Power Supply Sparkes.

    I have seen the fuse blow in a couple of power supplies. Most of the time simply replacing the fuse will make it work just fine again. I have never seen any components be damaged from this although it's not impossible.
  26. C

    K7N420 PRO Owners... please advise

    I have two Crucial PC2100 256 mb sticks. Work like a charm
  27. C

    Routing UDP vs TCP.

    Some reading for the interested: Linux Advanced Routing and Traffic Control HOWTO The Netfilter Framework in Linux 2.4 They should provide a very hands on approach to get it working.
  28. C

    Routing UDP vs TCP.

    You could probably use the netfilter package in Linux 2.4.x kernel to mark all IP packets carrying UDP traffic and then do routing based on that mark. The problem would probably be that your TCP traffic will have one IP address, and your UDP traffic another IP address. Hence a server which...
  29. C

    crypto computer programming

    << Look up the Diffe-Helman algorithm it is a rather simple algorithm which uses the properties of exponents to cancel out unknowns with a randomly generated number and a known number transferred between the two parties. I believe it is implemented in Blowfish encryption. >> You are...
  30. C

    crypto computer programming

    If you want to implement a really simple algorithm do the RC4 stream cipher. It's very easy to implement and also secure giving that you avoid the few pitfalls there are (repeat the state array mixing routine approx 20 times instead of one is probably the most important one). If this is too...
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    Windows 2000 VPN - Change IP Address

    We don't use Active Directory. It's mostly a UNIX network where people at home can access the internal servers from their homes, but at home their LAN cards have all sorts of different IP addresses. We want to map a specific user to a specific IP address when he logs in.
  32. C

    Windows 2000 VPN - Change IP Address

    I have set up a VPN connection between a Linux FreeS/WAN box and Windows 2000 using X509 certificates, but I was wondering if it's possible to give the Windows box a different IP address on the network we connect to? As it is now, the Windows box keeps it's own IP address and that is not what...
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    Filesystems: Pros/Cons

    I have tested writing NTFS partitions from Linux a few times. My experience is that instead of "It may or may not cause problems" it should be "will eventually cause problems" If you stress the file system, it becomes currupted very fast. If you just write a single file sometimes it can survive...
  34. C

    NAT as Firewall

    This is done through the Windows registry, although there are programs that will make this task easier. Have a look at http://www.practicallynetworked.com/sharing/ics/icsconfiguration.htm
  35. C

    NAT as Firewall

    << To me a firewall is something that secures one network from access by another and NAT does this. >> Well, NAT can't do this alone, it needs to run on some device. That device could be (and normally is) a firewall and NAT is one of the tools the firewall can use to do it's job (just as it...
  36. C

    NAT as Firewall

    You are mixing things up. NAT has nothing to do with firewalling. NAT is a technology used to have a local IP address on your private network and the router has one or more global IP adresses assigned to it. It then translates between those two. Also with a small modification you can use several...
  37. C

    traveling salesman problem

    << it isn't directly.... but there is some way to convert every NP problem into the other types. if you can solve one, you can solve them all. >> To be more precise: You can reduce every NP-Complete (and easier) problem to any NP complete problem you might want. You cannot, however, reduce...
  38. C

    value of 0 over 0

    My TI-85 is boring, but pretty informative: ERROR 02 DIV BY ZERO
  39. C

    value of 0 over 0

    I'm glad that we agree :) I am one course away from having a minor in mathemathics, and have had courses in both analysis and calculus.
  40. C

    value of 0 over 0

    << The rule that anything divided by itself (in this case 0/0) is equal to 1... >> There is no rule stating that. What you are probably referring to is one of the definitions of a field, namely the condition that says: In a field each element except from the additive identity (0) has a...
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