User Global nomad - Cryptography Stack Exchange

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	108 reputation	bio	website		visits	member for	1 year, 5 months
17 badges		location	Santa Clara, CA		seen	23 hours ago

10

48

votes

10

answers

3

kviews

Is modern encryption needlessly complicated?

may 22 '12 at 19:57 albanx 101

16

45

votes

14

answers

3

kviews

Time Capsule cryptography?

time-sensitive

dec 25 at 14:42 Leon 1

3

16

votes

6

answers

893

views

Is there a secure cryptosystem that can be performed mentally?

encryption passwords

aug 8 at 20:35 John Deters 1,000

7

16

votes

3

answers

1

kviews

How big an RSA key is considered secure today?

public-key rsa key-size factorization

jul 27 at 9:34 CodesInChaos 5,964

4

15

votes

7

answers

1

kviews

How can SSL secure a two-way communication with only one key-pair?

encryption ssl public-key keys

may 28 '12 at 20:00 Paŭlo Ebermann♦ 9,720

2

15

votes

3

answers

226

views

What differentiates a password hash from a cryptographic hash besides speed?

passwords hash

jul 11 at 15:16 David Schwartz 2,647

2

13

votes

2

answers

527

views

What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do?

hash hmac authenticated-encryption

jun 22 '12 at 9:01 fgrieu 9,889

5

13

votes

1

answer

382

views

Is this password migration strategy secure?

cryptanalysis protocol-design passwords

jun 22 '12 at 15:50 fgrieu 9,889

3

11

votes

2

answers

1

kviews

“SHA-256” vs “any 256 bits of SHA-512”, which is more secure?

hash sha256 sha-2

jul 10 at 11:34 fgrieu 9,889

1

11

votes

6

answers

354

views

Can I encrypt user input in a way I can't decrypt it for a certain period of time?

encryption

may 2 '12 at 22:08 dan 58

1

10

votes

2

answers

3

kviews

How long does it take to crack DES and AES?

aes block-cipher brute-force-attack des

apr 19 at 9:25 user2298509 1

3

10

votes

2

answers

407

views

Encryption scheme for social-network-like data sharing data via untrusted server?

encryption host-proof

jul 6 at 20:18 David Cary 868

3

9

votes

2

answers

781

views

What is the most practical fully homomorphic cryptosystem?

homomorphic-encryption

may 3 at 12:38 mikeazo♦ 7,595

1

9

votes

3

answers

3

kviews

Why is AES resistant to known-plaintext attacks?

aes block-cipher known-plaintext-attack

oct 31 at 21:05 Community♦ 1

3

9

votes

2

answers

318

views

Is every output of a hash function possible?

hash

may 30 '12 at 19:11 fgrieu 9,889

1

8

votes

1

answer

401

views

How can I make my cipher show the avalanche effect?

encryption salt cipher password-based-encryption

dec 30 '11 at 14:27 Community♦ 1

1

8

votes

3

answers

2

kviews

What is the difference between known-plaintext attack and chosen-plaintext attack?

cryptanalysis known-plaintext-attack chosen-plaintext-attack

jun 21 '12 at 18:22 cryptopathe 547

3

6

votes

1

answer

374

views

Why Addition Mod 32?

algorithm-design xor twofish

jun 17 '12 at 18:21 poncho 14.6k

2

6

votes

2

answers

1

kviews

Impacts of not using RSA exponent of 65537

public-key rsa

jul 2 at 10:50 fgrieu 9,889

2

6

votes

1

answer

829

views

why do we need Diffie Hellman?

diffie-hellman key-exchange

jul 14 at 12:05 CodesInChaos 5,964

2

6

votes

2

answers

335

views

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

hash passwords pgp bcrypt

jul 16 at 23:42 Thomas Pornin 19.1k

1

6

votes

3

answers

202

views

Why is a MAC needed?

block-cipher mac

jul 23 at 17:19 Paŭlo Ebermann♦ 9,720

1

5

votes

2

answers

2

kviews

What's the fundamental difference between Diffie-Hellman and RSA?

encryption public-key rsa diffie-hellman

oct 2 at 19:38 Jon Callas 855

2

5

votes

3

answers

428

views

Encryption algorithm that produces dummy output on incorrect passwords

encryption host-proof format-preserving deniable-encryption

jul 22 at 18:51 dchest 487

2

5

votes

1

answer

110

views

How to turn adversary against encryption of zeroes into adversary against random bits?

encryption provable-security

aug 7 at 16:41 Paŭlo Ebermann♦ 9,720

2

5

votes

1

answer

142

views

How are state wiretaps obtaining plaintext from encrypted transmissions?

encryption

jun 30 at 12:40 Hendrik Brummermann♦ 493

1

5

votes

2

answers

690

views

Why do block ciphers need a non-linear component (like an S-box)?

cryptanalysis block-cipher algorithm-design s-boxes linear-cryptanalysis

jan 2 at 20:20 user80998 1

1

5

votes

2

answers

204

views

Is there a hash algorithm that is slow to calculate but relatively fast to check?

hash one-way-function

apr 10 '12 at 1:43 B-Con 2,164

1

5

votes

1

answer

301

views

Why are MACs in general deterministic, whereas digital signature constructions are randomized?

signature mac ecdsa randomness dsa

may 30 '12 at 8:09 fgrieu 9,889

2

5

votes

4

answers

992

views

What alphanumeric string length can be used to guarantee no hash collisions from CRC-64?

hash crc

may 28 '12 at 21:05 poncho 14.6k

Global nomad

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