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	13 hours ago

10

48

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10

answers

3

kviews

Is modern encryption needlessly complicated?

may 22 '12 at 19:57 albanx 101

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

16

45

votes

14

answers

3

kviews

Time Capsule cryptography?

time-sensitive

dec 25 at 14:42 Leon 1

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

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

2

6

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

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

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♦ 9,765

2

votes

1

answer

1

kviews

How do I store encrypted files on a web server and decrypt them locally?

aes passwords pbkdf-2 host-proof

aug 18 at 12:44 Eyal 175

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

5

votes

4

answers

994

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

3

5

votes

3

answers

926

views

In the SHA hash algorithm, why is the message always padded?

hash sha1 padding

jun 1 '12 at 16:16 mikeazo♦ 7,595

3

16

votes

6

answers

900

views

Is there a secure cryptosystem that can be performed mentally?

encryption passwords

aug 8 at 20:35 John Deters 1,000

2

6

votes

1

answer

836

views

why do we need Diffie Hellman?

diffie-hellman key-exchange

jul 14 at 12:05 CodesInChaos 5,964

3

9

votes

2

answers

782

views

What is the most practical fully homomorphic cryptosystem?

homomorphic-encryption

may 3 at 12:38 mikeazo♦ 7,595

1

4

votes

3

answers

767

views

Are there any simple and yet secure encryption algorithms?

encryption aes block-cipher algorithm-design

jul 3 at 17:13 Thomas 2,589

1

vote

1

answer

736

views

Is AES restricted to only 64 characters for the key/password?

aes passwords key-derivation

apr 9 '12 at 14:22 Antony Vennard 2,492

1

2

votes

1

answer

729

views

In which order are the round keys used during AES decryption?

encryption aes block-cipher

may 28 '12 at 19:26 Paŭlo Ebermann♦ 9,765

1

6

votes

2

answers

698

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

2

votes

1

answer

577

views

What is the difference between CBC and GCM mode?

encryption modes-of-operation

apr 9 '12 at 2:42 poncho 14.6k

2

3

votes

3

answers

566

views

Why is the IV passed in the clear when it can be easily encrypted?

encryption initialization-vector

nov 29 at 21:50 owlstead 640

2

13

votes

2

answers

533

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

2

4

votes

4

answers

492

views

How can I validate a hashed password if all I have is another hash?

hash passwords authentication

dec 2 at 6:01 AshRj 111

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

3

10

votes

2

answers

409

views

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

encryption host-proof

jul 6 at 20:18 David Cary 868

1

3

votes

3

answers

405

views

What is the relation between Discrete Log, Computational Diffie-Hellman and Decisional Diffie-Hellman?

diffie-hellman discrete-logarithm

may 19 '12 at 18:03 Paŭlo Ebermann♦ 9,765

1

8

votes

1

answer

404

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

2

4

votes

3

answers

392

views

CBC - a canonical mode, even though there are streaming modes

block-cipher modes-of-operation symmetric stream-cipher

jun 6 '12 at 20:06 Paŭlo Ebermann♦ 9,765

5

13

votes

1

answer

386

views

Is this password migration strategy secure?

cryptanalysis protocol-design passwords

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

Global nomad

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