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Nov
13
comment Private and public keys, how do they relate mathematically?
Also, please have a look at the questions linked at the side bar under "Related" ... I guess some of them might answer your question.
Nov
12
comment Why can't I reverse a hash to a possible input?
Basically, all currently known hash unbroken functions are just "nobody knows how to break them". I don't think any of them has a complete proof. (Some have partial proofs showing that they are "secure" (in some formal sense) if some component is "secure" (in the same or another formal sense)).
Nov
5
awarded  Good Answer
Oct
25
comment Should I use ECB or CBC encryption mode for my block cipher?
@Imray I guess when your data is smaller than one block, and will not repeat anyways (i.e. already includes a nonce), and you are really space/bandwidth-limited, ECB has some uses. Might have other ones I'm not aware of.
Oct
21
awarded  Nice Answer
Oct
12
awarded  Enlightened
Oct
12
awarded  Nice Answer
Oct
9
awarded  Nice Question
Oct
5
awarded  Nice Answer
Sep
22
awarded  Nice Question
Sep
17
awarded  Nice Answer
Sep
5
awarded  Nice Answer
Sep
1
comment How does the index of coincidence work in the Kasiki test?
No, it depends on the text being typical enough (i.e. having a typical distribution of letters for the language being analyzed), and long enough.
Aug
30
comment Webcam random number generator
@PaulUszak does it say anything about JPEG? The webcam could give you pure uncompressed image data, which you can subtract. (The web page doesn't seem to be available anymore.) I also don't see how treating the whole JPEG file as one entropy source makes stuff better.
Aug
27
awarded  Enlightened
Aug
27
awarded  Nice Answer
Aug
27
awarded  Nice Answer
Aug
23
answered Request for review: known plaintext mitigation by rotation and xor encoding
Aug
21
answered Combine two sha512 hashes to a single hash
Aug
20
revised Combining several symmetric ciphers using XOR
associativity alone is not enough.