network profile
| bio | website | |
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| age | ||
| visits | member for | 1 year, 9 months |
| seen | Apr 17 at 18:06 | |
| stats | profile views | 1 |
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Feb 14 |
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How to best obtain bit sequences from throwing normal dice? @Mok-Kong Shen: Yes, there's an efficiency drop for 3 rolls. You figures seem to be right. |
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Jan 17 |
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LFSR for small numbers with large periods @gl3829: No idea, what you're doing wrong, but fgrieu is obviously right. Try to pick the lower 1 bit. According to you you'll get a period of two, but it must be just like described in the second paragraph. Moreover, for any $m<n$ there's no number missing. I'd guess your LSFR is wrong. |
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Oct 28 |
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How do ciphers change plaintext into numeric digits for computing? @fgrieu: This is surely true (and I should have said it), but this goes far beyond "converting message into number" (which is probably what the OP wanted to know). |
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Oct 28 |
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Is there an algorithm for factoring N, which is just as simple as this one, but faster? @Thomas: Doesn't it? I'm basically saying that the choice of Ň gains nothing. So yes, there are better algorithms out there, and for number as small as the given one it's easy to implement. |
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Oct 28 |
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Is there an algorithm for factoring N, which is just as simple as this one, but faster? I'm no expert in cryptography and have spent only few minutes reading it, but it looks bad too. Unfortunately, whenever it looks like it needs no advanced math, it can't be right (unless it's one of the known algorithms). Note that something as simple as Pollard's rho can factor a number like the above in a few milliseconds. |
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Aug 31 |
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Random Sequence Generator function Can't any even-permutations-only generating cipher be made "perfect" by a trivial postprocessing conditionally switching two outputs (with a 50% probability based on the key)? |
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Aug 30 |
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No SHA-1 Collision? Yet SHA1 is broken? @Andrew Tomazos - Fathomling: Using the "birthday paradox", there's a brute force attack against any hash of length 160 bits (like SHA-1) taking $2^{80}$ operations. Anything faster is a break. |
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Aug 30 |
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Do I have to have a different salt for each password? What I meant wasn't the UI, but using the whole string the way the OP proposed, i.e., something like searching for PBKDF2(username + ":" + password). |
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Aug 30 |
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Do I have to have a different salt for each password? What about the user entering a single string composed of their username and their password (possibly with a separator)? Doesn't this schema have exactly the same strength as the classical one? |
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Aug 28 |
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Secure Hash Function based on AES For SHA-3 candidates using AES or similar parts see e.g. this paper. |
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Aug 28 |
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Is there a way to make RC4 (ARCFOUR) secure, or is it completely broken? @Kevin Jin: Do you really need to authenticate each tiny packet? This could get really expensive. For 128 bit security you need to send 128 bits... but if your program aborts after 10 failed attempts, you'd need less. That said, I'd look for a complete solution, running your own is too risky. |
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Aug 24 |
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How do ciphers change plaintext into numeric digits for computing? HTTPS uses a symmetric cipher, which one is subject to negotiation between the parties. It's all quite complicated, but for sure it doesn't use RSA for the whole communication as this would be extremely inefficient. |
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Aug 20 |
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Trying to find an algorithm to share portions of a key with multiple people For implementation, I'd suggest using GF(256) over prime fields. It has no size limitations, works bytewise, need no padding, no multiple precision arithmetic, and is probably faster and easy to program (even I did it:D). It limits the number of shares to 255, which should suffice. |
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Aug 19 |
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What are the methods to construct a primitive binary nonlinear feedback shift register (NLFSR)? @Bluemilk: I'm quite sure there's no such thing as primitive binary NLFSR, since the word primitive comes from "primitive polynomial over GF(2)" which makes sense for a LFSR only. That said, I can live with your definition. I'm afraid the search algorithm was just some smarter exhaustive search... given the prescribed form, it looks possible to me. |
