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1d
comment Does composing multiple substitution ciphers improve security?
@TruthSerum I don't see how exactly cyclic permutations are relevant here, as compositions of cyclic permutations are usually not cyclic.
1d
comment Does composing multiple substitution ciphers improve security?
The group spanned by just reflections and rotations is not the full permutation group of the vertices. In the same way, while all Caesar ciphers form a group (the rotation group of your 26-gon), this group isn't the full group of simple substitution ciphers.
Apr
17
awarded  Good Answer
Apr
2
awarded  Enlightened
Apr
2
awarded  Nice Answer
Apr
2
revised Big-O Notation: Encryption Algorithms
gets → becomes
Apr
2
comment Why is the discrete logarithm problem assumed to be hard?
@David天宇Wong $O(\log_a(n))$ and $O(\log_b(n))$ are the same complexity classes for every choice of $a, b > 1$ (because $\log_a(n) = \log_b(n) · \log_a(b)$. Due to this, the base is often omitted in complexity calculations.
Mar
11
comment Would a non-deterministic (read: randomized) compression algorithm be crypto-safe?
What means "crypto-safe" for you?
Feb
25
awarded  Enlightened
Feb
25
awarded  Nice Answer
Feb
24
comment How would the opponent defraud this secure communication?
@mikeazo not having integrity protection might enable a break of confidentiality too, as it can enable chosen-ciphertext attacks like in this XML-encryption attack some years ago.
Feb
24
reviewed Close Compression in Symmetric-Encryption?
Feb
24
reviewed Close Is it secure to send the hash along the message without encryption?
Feb
24
comment Is it secure to send the hash along the message without encryption?
A hash by itself does not guarantee integrity, if the attacker can modify the hash value together with the message.
Feb
10
reviewed Approve Webcam random number generator
Feb
5
awarded  cryptanalysis
Feb
2
comment Is AES in CBC mode secure if a known and/or fixed IV is used?
@juwiley I would suggest wikipedia's Mode of Operation article as a first start, it has many more links.
Jan
19
awarded  Nice Answer
Jan
17
comment Are there any advantages in using proprietary encryption?
I wouldn't call it "state of the art" to use an proprietary (i.e. not widely analyzed) algorithm. Maybe "cutting edge" is more correct (and even sounds cooler).
Jan
16
awarded  Favorite Question