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visits member for 2 years, 11 months
seen 13 hours ago

Aug
10
comment Is there a simple hash function that one can compute without a computer?
Perhaps when we find a good hand hash, we could also use it for generating site-specific passwords which can be executed in my own head?.
Aug
10
comment Do I have to recompute all hashes if I change the work factor in bcrypt?
@PaŭloEbermann: Ah, right -- some password hash functions allow one to "continue", but not bcrypt.
Aug
9
answered Entropy of system data - use all and hash, or trim least significant bits?
Aug
8
answered Secure private key storage
Aug
8
comment Secure private key storage
related: "How to create Java Key Store (.jks) file with AES encryption?"
Aug
3
answered Is there a simple hash function that one can compute without a computer?
Jul
31
wiki created host-proof description
Jul
31
wiki created host-proof excerpt
Jul
30
comment What is the difference between a stream cipher and a one-time-pad?
The one-time pad and Venona project articles say that the USSR and a few other organizations heavily used physical pads of random-looking letters called one-time pads. I think it's pretty likely that practically all of those pads were, in fact, generated with a 100% physical RNG, although I don't really have any evidence one way or another. I suspect that we may never know exactly how those pads were generated.
Jul
30
comment How do I calculate CRC32 mathematically?
Does "A Painless Guide to CRC Error Detection Algorithms" help?
Jul
30
comment Is there a simple hash function that one can compute without a computer?
Variation: In addition to forcing every entry in the input column to be unique, also force every entry in the output column to be unique. I.e.: After writing new input on the paper, flip a quarter 8 times, writing the output on scratch paper. If the scratch 8-bit output pattern is already in the output column, to prevent collisions, repeat flipping the quarter 8 more times. When you eventually get a scratch 8-bit output pattern not already in the output column, copy it to the output column. Alas, this variant is awkward for more than 128 unique inputs, and fails after 256.
Jul
28
answered Should I use md5 for my new application?
Jul
24
awarded  Commentator
Jul
24
comment Trying to find an algorithm to share portions of a key with multiple people
In particular, there are several open-source implementations of this algorithm, such as ssss-split and ssss-combine and Life, Death, and Splitting Secrets‌​.
Jul
24
revised Relation between Threshold Cryptosystem and Secure Multiparty Computation ?
edited tags
Jul
24
answered PRNG taking advantage of very large seed
Jul
22
revised Encryption algorithm that produces dummy output on incorrect passwords
edited tags
Jul
22
revised Encryption algorithm that produces dummy output on incorrect passwords
edited tags
Jul
21
revised Is there a standard for OpenSSL-interoperable AES encryption?
one more thing ...
Jul
21
asked Is there a standard for OpenSSL-interoperable AES encryption?