User Grzegorz Wierzowiecki - Cryptography Stack Exchange

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	111 reputation	bio	website		visits	member for	1 year, 2 months
4 badges		location	Warsaw, Poland		seen	Nov 5 '12 at 12:14

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216

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What's the difference between a Key Derivation Function and a Password-Hash?

hash key-derivation

oct 13 at 16:00 owlstead 640

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9

votes

2

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270

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Bitcoin Research

bitcoin

sep 6 at 13:26 PulpSpy 4,489

1

vote

3

answers

324

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Malleability attacks against encryption without authentication

block-cipher cbc malleability

aug 31 at 4:50 D.W. 8,047

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votes

1

answer

99

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Zero Knowledge auth schemes with weak secret

diffie-hellman zero-knowledge-proofs dictionary-attack

aug 22 at 0:33 poncho 14.6k

1

4

votes

2

answers

188

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Do MD5's weaknesses affect Oplop?

hash passwords hash-collision md5

aug 11 at 10:22 fgrieu 9,954

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1

answer

370

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Is a second preimage attack on MD5 feasible?

hash md5 2nd-preimage-resistance

aug 3 at 17:35 D.W. 8,047

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votes

4

answers

177

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Signature and Timestamp for Long Term Document Archival Question

signature certificates integrity timestamping

sep 7 at 12:55 Thomas Pornin 19.1k

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6

votes

2

answers

339

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Is bcrypt better than GnupPG's iterated+salted hashing method?

hash passwords pgp bcrypt

jul 16 at 23:42 Thomas Pornin 19.1k

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votes

1

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142

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How are state wiretaps obtaining plaintext from encrypted transmissions?

encryption

jun 30 at 12:40 Hendrik Brummermann♦ 503

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votes

3

answers

575

views

What is the recommended replacement for MD5?

hash

may 19 at 21:01 fgrieu 9,954

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2

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3

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425

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Hash function in PBKDF2

hash implementation passwords padding pbkdf-2

jun 18 '12 at 12:08 fgrieu 9,954

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1

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193

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Padding for the TEA

implementation algorithm-design key-size

jun 12 '12 at 19:04 fgrieu 9,954

3

9

votes

2

answers

319

views

Is every output of a hash function possible?

hash

may 30 '12 at 19:11 fgrieu 9,954

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155

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One-way hash on encrypted data, result hidden from hasher

may 1 '12 at 16:30 mikeazo♦ 7,595

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1

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213

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Can a digital money system exist, that's secure, anonymous and allows offline transactions?

digital-cash

apr 22 '12 at 16:46 imichaelmiers 596

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votes

4

answers

908

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How are timestamps verified?

hash public-key signature timestamping

sep 6 at 13:23 PulpSpy 4,489

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9

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2

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317

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Proving knowledge of a preimage of a hash without disclosing it?

hash zero-knowledge-proofs

oct 16 at 16:02 bob 772

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2

votes

2

answers

214

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AESManaged Trade Compliance Issue in United States

encryption aes

jan 7 '12 at 12:24 dchest 487

1

10

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2

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267

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Are safe primes $p=2^k \pm s$ with $s$ small less recommandable than others as a discrete log modulus?

discrete-logarithm prime-numbers

mar 25 at 19:11 Samuel Neves 1,027

1

7

votes

3

answers

1

kviews

What is pre-image resistance, and how can the lack thereof be exploited?

hash hash-collision preimage-resistance collision-resistance

jan 14 '12 at 18:27 Antony Vennard 2,492

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1

kviews

RIPEMD versus SHA-x, what are the main pros and cons?

hash ripemd

oct 12 '11 at 16:59 Thomas Pornin 19.1k

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2

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932

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What is wrong with using SHA1 in digital signatures? Why is a robust hash function needed?

hash signature

sep 28 '11 at 19:26 Paŭlo Ebermann♦ 9,765

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2

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345

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Is digest=HASH(HASH(a)+HASH(b)) equivalent to publishing two digests?

hash

aug 25 '11 at 0:52 fgrieu 9,954

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2

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542

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Is SHA-512 bijective when hashing a single 512-bit block?

hash sha-2

oct 25 '11 at 20:09 Paŭlo Ebermann♦ 9,765

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3

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672

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Is using slow password hashing on the client side easier attackable than on the server side?

hash passwords protocol-design

jul 29 '11 at 15:55 Paŭlo Ebermann♦ 9,765

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2

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329

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What is the general justification for the hardness of finding preimages for cryptographic hash functions?

hash cryptanalysis preimage-resistance

oct 24 '11 at 12:07 Jus12 721

Grzegorz Wierzowiecki

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