Cryptography Stack Exchange

1

vote

1

answer

15

views

Any way to prove possession of a RSA 2048 private key using 256 bit?

rsa sha-256

modified 11 mins ago poncho 116k

3

votes

2

answers

143

views

+100

Must a line hitting two points on the elliptic curve over a finite field hit another point by continuation?

elliptic-curves finite-field

modified 3 hours ago Myath 660

0

votes

0

answers

11

views

Web Cryptography API and low level AES APIs

aes

asked 4 hours ago cristian 1

2

votes

0

answers

21

views

Earliest citation for truth density

function-evaluation hamming

modified 4 hours ago John 121

0

votes

2

answers

55

views

What is the need for Diffie-Hellman key exchange when we have asymmetric encryption?

encryption public-key diffie-hellman

modified 5 hours ago Christoph Sarnowski 1

0

votes

1

answer

27

views

Hill Cipher: Finding Encryption and Decryption Key Matrix

cryptanalysis hill-cipher

modified 7 hours ago kelalaka 29.3k

1

vote

1

answer

25

views

Attack MD5 with limited input and partial information

hash md5 preimage-resistance

modified 8 hours ago kelalaka 29.3k

2

votes

2

answers

67

views

Can I use ChaCha20-Poly1305 as my KDF?

authenticated-encryption salt nonce chacha poly1305

answered 8 hours ago mint branch conditioner 65

3

votes

1

answer

51

views

Nothing-up-my-sleeve numbers standard

algorithm-design constants

answered 9 hours ago Modal Nest 1,261

1

vote

1

answer

21

views

How are keys mapped to cipher texts in block ciphers with large block sizes?

block-cipher

modified 9 hours ago kelalaka 29.3k

20

votes

2

answers

11k

views

What size should the HMAC key be with SHA-256?

hmac sha-256 key-size

modified 10 hours ago Maarten Bodewes♦ 76.2k

9

votes

3

answers

11k

views

Is RSA-OAEP deprecated?

rsa oaep

modified 10 hours ago vy32 367

1

vote

1

answer

142

views

What is the current security level of an algorithm?

cryptanalysis brute-force-attack key-size

modified 10 hours ago Community♦ 1

1

vote

1

answer

20

views

Decryption formula of Plaintext Block Chaining (PBC) mode of a block cipher

encryption block-cipher decryption

modified 12 hours ago kelalaka 29.3k

19

votes

3

answers

3k

views

Is there an AES identity key?

aes

modified 13 hours ago benrg 233

19

votes

4

answers

4k

views

After 20 years of AES, what are the retrospective changes that should have been made?

aes

modified 13 hours ago Glorfindel 321

1

vote

0

answers

25

views

HKDF with manipulated Salt

key-derivation salt hkdf

asked 16 hours ago Marc 183

0

votes

1

answer

81

views

Is there any chance of failure in Cryptography

encryption

modified 17 hours ago Maarten Bodewes♦ 76.2k

1

vote

1

answer

21

views

Encode ASN.1 PKCS#8 Private Key with Public Key and attributes

public-key ed25519 encoding asn.1

modified 17 hours ago Maarten Bodewes♦ 76.2k

1

vote

0

answers

27

views

Question about hiding commitment scheme for integers

discrete-logarithm terminology commitments

modified 17 hours ago Maarten Bodewes♦ 76.2k

2

votes

2

answers

324

views

How to prove that a rainbow table is complete?

passwords attack password-hashing rainbow-table dictionary-attack

answered 17 hours ago user2381 41

0

votes

1

answer

39

views

Is this method of salting effective?

passwords password-hashing database

modified yesterday Aman Grewal 763

1

vote

2

answers

74

views

Using raw encrypted network data for randomness

encryption random-number-generator

modified yesterday forest 10.9k

1

vote

1

answer

73

views

Can I retrieve a re-hashed (hash) value, for instance by additional hashing?

hash sha-256

modified yesterday kelalaka 29.3k

0

votes

0

answers

31

views

How would I encrypt a forum thread for thousands of users without duplicating the message in a database or creating new keys for client?

database broadcast-encryption

asked yesterday acw 101

0

votes

0

answers

31

views

I need to try to find an algorithm to decode a set of Excel dates [closed]

encryption data-privacy

modified yesterday brdrex 1

2

votes

1

answer

71

views

What is the overhead of GCM? And how are GCM tags signed by RSA/PKI?

rsa tls mac sha-256 gcm

answered yesterday poncho 116k

0

votes

1

answer

39

views

Verify correct answer transparently

encryption decryption

modified yesterday poncho 116k

11

votes

2

answers

2k

views

More than one private key for RSA

encryption rsa public-key

modified yesterday kelalaka 29.3k

5

votes

3

answers

7k

views

TRNG vs PRNG - Entropy?

random-number-generator entropy

answered yesterday Paul Uszak 11.6k

1

vote

1

answer

53

views

Can ECDSA signature signing and verification process replaces password hashed based login system?

elliptic-curves authentication passwords dsa password-hashing

answered yesterday bk2204 171

2

votes

1

answer

3k

views

What is the use of key iterations?

encryption keys key-derivation

modified yesterday Community♦ 1

3

votes

0

answers

38

views

Can the hash of the ciphertext be derived from the hash of the plaintext

encryption hash homomorphic-encryption

asked yesterday Tobias Brandt 131

2

votes

2

answers

959

views

Can ECDH be used for authentication?

diffie-hellman authentication

modified yesterday Community♦ 1

2

votes

1

answer

68

views

Cryptography Engineering - Design Principles and Practical Applications - Chapter 9 Generating Randomness - Section 9.4 The Generator

random-number-generator ctr probability

modified yesterday kelalaka 29.3k

2

votes

1

answer

51

views

How are SHACAL-2 ciphers calculated?

hash block-cipher sha-256 md5 merkle-damgaard

modified yesterday kelalaka 29.3k

3

votes

1

answer

60

views

The chi-square test for cryptography

cryptanalysis

answered yesterday Paul Uszak 11.6k

2

votes

0

answers

28

views

What does “the input difference of each Sbox should be zero” mean?

s-boxes

modified yesterday kelalaka 29.3k

5

votes

1

answer

257

views

How do I decide what mode to use?

aes block-cipher modes-of-operation openssl

modified yesterday Maarten Bodewes♦ 76.2k

0

votes

1

answer

61

views

How to show Hash-Then-Encrypt is not AE-secure

authenticated-encryption

modified yesterday Community♦ 1

47

votes

7

answers

10k

views

How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?

cryptanalysis block-cipher symmetric nsa

answered yesterday forest 10.9k

1

vote

0

answers

25

views

Is it necessary to use an IV in CBC mode when just encrypting one file? [duplicate]

aes cbc initialization-vector

modified yesterday forest 10.9k

1

vote

4

answers

237

views

Why does mt19937 fail the universal test in NIST SP 800-22?

random-number-generator randomness pseudo-random-generator statistical-test

modified yesterday Ripon Patgiri 11

-1

votes

0

answers

26

views

Aes 128 input and output size

encryption aes

asked 2 days ago Peter Kamel 1

0

votes

0

answers

18

views

How to count the number of selected element in each slot within the packed ciphertext

homomorphic-encryption

asked 2 days ago Dylan Wang 1

0

votes

0

answers

39

views

Is this a reasonable design for encrypting records in a key/value database?

protocol-design gcm chacha database key-rotation

modified 2 days ago theory 101

1

vote

1

answer

59

views

Computing $g^y\bmod p$ from $g^{y^2}\bmod p$ if Diffie-Hellman is compromised?

diffie-hellman discrete-logarithm

answered 2 days ago poncho 116k

3

votes

1

answer

53

views

Corner cases of addition on short Weierstrass elliptic curves

elliptic-curves

modified 2 days ago kelalaka 29.3k

Top Questions

Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.