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Sep
1
revised How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
rewrote question to be inline with the standards of crypto SO
Sep
1
comment How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
@gokoon - are my edits in line with what you wished to ask with this question?
Sep
1
suggested approved edit on How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
Aug
19
answered How long would the 100 Year Cryptography Project have secured its data had it been started 100 years ago?
Aug
11
comment The use of cribs
@mixedmath in your defense, codes and code books are still used by militaries in all parts of the world. Breaking such code books are not particular interesting to academic cryptographers as the methods and techniques have already been researched exhaustively, but intelligence agencies still have to break code books.
Aug
11
comment Is it possible to derive the encryption method from encrypted text?
@Nayuki Minase - The functions themselves may by pseudorandom, but what about the increments, the other bits of information that no one likes to talk about. Can a block cipher running in 'ciphertext stealing' mode produce an odd number of bits, can it operate on the bit level rather than the byte level? What does it do if the input size is less than one block? How does it fail?
Aug
11
comment Is it possible to derive the encryption method from encrypted text?
@Nayuki Minase - Can you distinguish a stream cipher from a block cipher running in 'ciphertext stealing' mode?
Aug
10
answered The use of cribs
Aug
5
comment What is the general justification for the hardness of finding preimages for cryptographic hash functions?
+1 Interesting. Are there any research papers that you would recommend that use proof of resistance to 3SAT to argue the strength of various hash functions/ciphers?
Aug
2
awarded  Beta
Jul
27
comment About Cryptography in a Character Language
Frequency analysis would still work as some words are more common than others (even in chinese).
Jul
20
comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
If a given public_key can generate n possible ciphertexts for any message (this is what you mean by plausible ciphertexts right?), and the first bit of that plaintexts reduces the space of possible (plausible) ciphertexts, given that public_key, to n-1 doesn't that imply a bias in the possible (plausible) ciphertexts. If the first bit of the message does not reduce the number of possible ciphertexts I'm not sure how the process can possibly be reversible.
Jul
20
comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
It's good to know that I'm not duplicating someone elses work. I'll probably write up my design as a blog post and not sully crypto.so with a hobby cipher. Thanks for your help and comments.
Jul
20
comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
As a first glance designing a secure RSA block cipher with a CBC-like mode of operation does not seem to present any difficulties. Use a random secret value (a secret IV) as the input to the first block, then xor each input with the output of the last block (CBC mode). Sure the ciphertext is one block longer than the plaintext but you have your randomness and you only need to worry about your asymmetric cipher being hard to break (no symmetric weakness). Of course if the cipher has bias guessing the secret IV becomes becomes easier.
Jul
20
comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
Is it unimportant in the sense that given two asymmetric ciphers where one cipher has bias and the other cipher does not you would not prefer one without bias over the other? AES is used because it is significantly faster than RSA, but it introduces more surface area since a break in either RSA or AES results in decryption of your message. Is the idea that RSA + AES is good enough born out of the fact that we don't have a fast unbiased asymmetric cipher?
Jul
20
awarded  Commentator
Jul
20
awarded  Scholar
Jul
20
comment Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
Is bias required by any asymmetric algorithm? Is there a proof for this?
Jul
20
accepted Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?
Jul
19
asked Are any of the major asymmetric ciphers distinguishable (EG, RSA, ECC)?