12,958 reputation
32764
bio website paul-ebermann.tumblr.com
location Berlin, Germany
age
visits member for 3 years
seen 2 days ago

Don't fear to edit my posts: even if I have more reputation than you, I do make mistakes.

I'm now also a Moderator Pro Tempore (= until the first elections) at Cryptography Stack Exchange: feel free to come around and ask some cryptography questions.


My personal name is spoken as /ˈpawlo/ (IPA), in English this would be written similar to Powlo, I think (i.e. the vowels are ow and o), with an accent on the before-last syllable (which is the first in this case). It's the Esperanto form of my given name.

The photo shows my shadow, taken at night. My camera sometimes seems to forget all the other frequencies and only stores the green ones.

My current main private programming project is the game of fencing, an online abstract turn based strategy game. Implemented as a Java applet, using git as a version control system.


Some more links:


Sep
20
comment Designing a key expander out of ciphers
Hmm, a simple way would be to split the key in $n$ parts (e.g. the original key would have length $\sum k_n$), and use each part in one cipher. Not sure if this counts :-)
Sep
20
answered Changing algorithms during encryption
Sep
20
comment Accelerating SHA-1
Tree hashing is the way to go if you have large amounts of data and multiple cores available.
Sep
20
revised Why use an Initialization Vector (IV)?
edited tags
Sep
20
comment Accelerating SHA-1
Do you have a given protocol to implement, or can you change the protocol to make it faster (i.e. better parallelizable)?
Sep
20
answered What is the use of REAL random number generators in cryptography?
Sep
19
revised What is the best method to determine the language used in a monoalphabetic substitution cipher?
edited tags
Sep
19
comment Implementation of Tao Xie and Denguo Feng's MD5 attack
This might provide some base for answers: mathstat.dal.ca/~selinger/md5collision
Sep
18
revised Is it feasible to build a stream cipher from a cryptographic hash function?
shorter title (and cipher instead of cypher)
Sep
18
revised Is it feasible to build a stream cipher from a cryptographic hash function?
formatting the formulas using TeX
Sep
18
revised Converting a stream cipher into a block cipher
add description of these ciphers (from the linked answer)
Sep
18
revised Is it feasible to build a stream cipher from a cryptographic hash function?
formatting the formulas using TeX
Sep
18
answered Converting a stream cipher into a block cipher
Sep
18
revised How to forge Schnorr signatures if you can guess the challenge
formatting
Sep
17
revised What causes first block of AES decryption to be garbled, even with correct IV?
formatting the quote as such, adding link, some minor formatting
Sep
16
comment Understanding CRC
A CRC-32 is a (linear) mapping from $\mathbb Z_2^*$ to $\mathbb Z_2^{32}$, not an operation in $\mathbb Z_2^{32}$, or am I understanding this wrong?
Sep
15
revised Background for modular arithmetic function
formatting, citing the source more exactly
Sep
15
revised Background for modular arithmetic function
TeX formatting
Sep
15
reviewed Approve suggested edit on Background for modular arithmetic function
Sep
15
comment Analysis of Repeatedly Enciphered Plaintext using Same Algorithm / Key
A clearer way to write your third sentence would be the probability to reach the original plain text after at most r repeated encryptions is r/2^128.