User Nova

31 votes

How can hashes be unique if they are limited in number?

answered Apr 8, 2018 at 23:12

28 votes

How is XOR used for encryption?

answered Oct 4, 2014 at 17:57

14 votes

Accepted

Is a die implemented in a physics engine truly random?

answered Nov 5, 2014 at 2:14

14 votes

Accepted

Why does applying 56-bit DES twice only give 57 bits of security?

answered Apr 18, 2015 at 14:19

12 votes

Accepted

Reusing message in One Time Pad

answered Sep 26, 2014 at 14:19

10 votes

Accepted

How exactly does AES-NI work?

answered Oct 8, 2014 at 20:24

10 votes

Accepted

What makes an algorithm "fast in software" vs. "fast in hardware"?

answered Dec 21, 2014 at 18:45

10 votes

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

answered Apr 5, 2015 at 20:20

9 votes

what is the current actual budget - as of 2015 - needed to build a DES breaker machine?

answered Mar 10, 2015 at 16:02

8 votes

Rounds in cryptography

answered Nov 30, 2014 at 6:31

8 votes

Accepted

Why does the DES crypto algorithm NOT use 2 rounds?

answered Feb 2, 2015 at 2:26

8 votes

How does MD5 process text which is shorter than 512 bits

answered Oct 10, 2014 at 4:20

8 votes

Number of keys for a monoalphabetic cipher

answered Oct 5, 2014 at 5:13

7 votes

Vigenère ciphertext encrypted with another Vigenère cipher

answered Sep 27, 2014 at 21:16

7 votes

Accepted

In RSA, why does $p$ have to be bigger than $q$ where $n=p \times q$?

answered Jul 11, 2014 at 4:07

7 votes

DES generating the same ciphertext for different plaintexts and identical key

answered Dec 29, 2014 at 12:49

6 votes

Accepted

what are the plaintext's for the RC4 stream cipher test vectors in RFC6229?

answered Dec 19, 2014 at 20:09

6 votes

Accepted

Brute-forcing Symmetric Keys

answered Apr 22, 2017 at 3:17

5 votes

When is a cipher considered broken?

answered Mar 9, 2015 at 19:20

5 votes

Why can the last block contain a full block of padding in CBC Encryption?

answered Feb 26, 2015 at 1:18

5 votes

How do we compute IV+1 in CTR mode?

answered Jul 21, 2014 at 16:46

5 votes

Accepted

How can AES be considered secure when encrypting large files?

answered Sep 11, 2014 at 19:03

5 votes

Is the 64-bit blocksize a fatal issue when encrypting TBs of data with Blowfish CBC?

answered Oct 7, 2014 at 23:42

4 votes

What is more secure, a ciphertext encrypted with AES-256 or encrypted with 3 different AES-128 keys?

answered Nov 5, 2014 at 5:56

4 votes

Accepted

Why sorting is needed for Meet-in-the-middle attack

answered Nov 16, 2014 at 16:23

4 votes

OpenSSL RSA same plaintext but different ciphertext

answered Nov 16, 2014 at 19:03

4 votes

I have created values for RSA encryption but it doesn't always work

answered May 3, 2019 at 22:27

4 votes

Why SHA-256 (or any other) is too fast for passwords but "slow" for collisions to be found?

answered Mar 7, 2018 at 22:44

4 votes

Accepted

How can I share a number with an opponent?

answered Apr 5, 2018 at 12:23

4 votes

Why is a Diffie-Hellman key exchange required when RSA is already being used for key exchange in TLS?

answered Apr 11, 2018 at 4:51

Stack Exchange Network

63 Answers

How can hashes be unique if they are limited in number?

How is XOR used for encryption?

Is a die implemented in a physics engine truly random?

Why does applying 56-bit DES twice only give 57 bits of security?

Reusing message in One Time Pad

How exactly does AES-NI work?

What makes an algorithm "fast in software" vs. "fast in hardware"?

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

what is the current actual budget - as of 2015 - needed to build a DES breaker machine?

Rounds in cryptography

Why does the DES crypto algorithm NOT use 2 rounds?

How does MD5 process text which is shorter than 512 bits

Number of keys for a monoalphabetic cipher

Vigenère ciphertext encrypted with another Vigenère cipher

In RSA, why does $p$ have to be bigger than $q$ where $n=p \times q$?

DES generating the same ciphertext for different plaintexts and identical key

what are the plaintext's for the RC4 stream cipher test vectors in RFC6229?

Brute-forcing Symmetric Keys

When is a cipher considered broken?

Why can the last block contain a full block of padding in CBC Encryption?

How do we compute IV+1 in CTR mode?

How can AES be considered secure when encrypting large files?

Is the 64-bit blocksize a fatal issue when encrypting TBs of data with Blowfish CBC?

What is more secure, a ciphertext encrypted with AES-256 or encrypted with 3 different AES-128 keys?

Why sorting is needed for Meet-in-the-middle attack

OpenSSL RSA same plaintext but different ciphertext

I have created values for RSA encryption but it doesn't always work

Why SHA-256 (or any other) is too fast for passwords but "slow" for collisions to be found?

How can I share a number with an opponent?

Why is a Diffie-Hellman key exchange required when RSA is already being used for key exchange in TLS?