User bk2204

21 votes

Accepted

Why is mod calculation necessary in a one time pad encryption?

answered Aug 15, 2021 at 20:30

19 votes

Accepted

Do I need to sanitize user input to scrypt, or to PBKDF's in general?

answered Sep 2, 2021 at 0:08

12 votes

Accepted

Would sending audio fragments over a phone call be considered a form of cryptology?

answered May 30 at 21:44

12 votes

Accepted

Why Ed25519 encodes y-coordinates rather than x-coordinates

answered Apr 14 at 20:16

11 votes

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Is it possible to create a pseudo-One Time Pad by using a key smaller than the plaintext?

answered Nov 27, 2022 at 23:04

7 votes

How bad are human-generated random numbers really (One Time Pad)?

answered Jan 24 at 22:46

7 votes

Is double SHA-256 the best choice for Bitcoin?

answered Jan 8, 2021 at 22:55

7 votes

Accepted

Why do people use protocols like PGP, when TLS already exists?

answered Nov 19, 2021 at 1:36

6 votes

Accepted

Converting a 32-bit ARX cipher to a 64-bit one, should the rounds be increased?

answered Jan 15, 2022 at 15:51

5 votes

What would be the benefit of using a Stream Cipher which achieves encryption performance of 0.01 cpb using 1 CPU thread?

answered Mar 19, 2022 at 18:05

5 votes

Accepted

What is the rationale for including addition in SHA-256?

answered Aug 11, 2022 at 21:54

5 votes

Accepted

Is sha3 a one-way funtion

answered Apr 5 at 0:48

4 votes

Is Argon2 based on BLAKE2b or is it only using the BLAKE2b at the end?

answered Aug 27 at 1:49

4 votes

Is MAC unnecessary for client side encryption?

answered Sep 4, 2022 at 21:00

4 votes

64 bit key size Diffie Hellman

answered Apr 6, 2022 at 21:46

4 votes

Accepted

Can future time-based keys be deduced from a previous key?

answered Aug 13, 2021 at 20:21

4 votes

Accepted

How to use cryptography to protect video from forgery?

answered Mar 13, 2021 at 0:32

4 votes

What makes Argon2 also slow?

answered Jul 16, 2021 at 2:21

4 votes

Accepted

Example situation where an authentication tag can prevent an attack?

answered Apr 9 at 17:22

3 votes

Accepted

Does adding a known text to an input decrease hash security?

answered Aug 27, 2021 at 21:52

3 votes

Accepted

How to reverse engineer Salt from password, iterations, and key?

answered Sep 17, 2021 at 21:39

3 votes

Why Elliptic Curve Cryptography protocols depend on fixed curves?

answered Jun 27, 2021 at 21:40

3 votes

Which Diffie-Hellman Groups does TLS 1.3 support? And should we use TLS 1.3 as a guide?

answered Jan 17, 2021 at 17:19

3 votes

RC4-40 with IV (32-bit) setup

answered Apr 3, 2022 at 17:10

3 votes

Why there are still no keys longer than 256 bit?

answered Aug 27, 2022 at 18:51

3 votes

What does it mean that DES algorithm was meant to run on hardware?

answered Dec 21, 2022 at 21:56

3 votes

256-bit security with Sponges

answered Dec 31, 2022 at 3:44

3 votes

Can we still use 64-bit block ciphers?

answered Apr 6 at 23:01

3 votes

Accepted

What kind of symmetric key ciphers are secure thanks to the intrinsic cryptographic method instead of making the key length very long and secure?

answered Feb 18 at 19:46

2 votes

Can the last n bitcoin blocks (including transactions) be reliable enough to be used as a seed for a PRNG or an input to a crypto hash-function?

answered May 10 at 22:29

Stack Exchange Network

74 Answers

Why is mod calculation necessary in a one time pad encryption?

Do I need to sanitize user input to scrypt, or to PBKDF's in general?

Would sending audio fragments over a phone call be considered a form of cryptology?

Why Ed25519 encodes y-coordinates rather than x-coordinates

Is it possible to create a pseudo-One Time Pad by using a key smaller than the plaintext?

How bad are human-generated random numbers really (One Time Pad)?

Is double SHA-256 the best choice for Bitcoin?

Why do people use protocols like PGP, when TLS already exists?

Converting a 32-bit ARX cipher to a 64-bit one, should the rounds be increased?

What would be the benefit of using a Stream Cipher which achieves encryption performance of 0.01 cpb using 1 CPU thread?

What is the rationale for including addition in SHA-256?

Is sha3 a one-way funtion

Is Argon2 based on BLAKE2b or is it only using the BLAKE2b at the end?

Is MAC unnecessary for client side encryption?

64 bit key size Diffie Hellman

Can future time-based keys be deduced from a previous key?

How to use cryptography to protect video from forgery?

What makes Argon2 also slow?

Example situation where an authentication tag can prevent an attack?

Does adding a known text to an input decrease hash security?

How to reverse engineer Salt from password, iterations, and key?

Why Elliptic Curve Cryptography protocols depend on fixed curves?

Which Diffie-Hellman Groups does TLS 1.3 support? And should we use TLS 1.3 as a guide?

RC4-40 with IV (32-bit) setup

Why there are still no keys longer than 256 bit?

What does it mean that DES algorithm was meant to run on hardware?

256-bit security with Sponges

Can we still use 64-bit block ciphers?

What kind of symmetric key ciphers are secure thanks to the intrinsic cryptographic method instead of making the key length very long and secure?

Can the last n bitcoin blocks (including transactions) be reliable enough to be used as a seed for a PRNG or an input to a crypto hash-function?