Cryptography Stack Exchange

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7

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How do I decode an encoded string without a key in Ruby? (basic cryptography)

asked 1 hour ago Raf.G 1

0

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0

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50

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How can I calculate the feasibility of brute-forcing missing secret shares against the secret checksum? [on hold]

modified 1 hour ago Marco Aurélio da Silva 108

9

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5

answers

3k

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Is there really no use for MD5 anymore?

hash md5

modified 3 hours ago Squeamish Ossifrage 23.4k

0

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0

answers

25

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How to exchange a common key to a group of person using Elliptic-curve Diffie–Hellman (ECDH)? [duplicate]

public-key elliptic-curves diffie-hellman key-exchange

modified 3 hours ago Anik Islam Abhi 108

1

vote

1

answer

10

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Cost model for different curve models

elliptic-curves finite-field

answered 3 hours ago Squeamish Ossifrage 23.4k

3

votes

1

answer

64

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How does PUF hardware help in software activation?

license-key puf copy-protection

answered 4 hours ago Paul Uszak 7,827

0

votes

0

answers

74

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How could I improve this general block cipher?

cryptanalysis block-cipher

modified 4 hours ago Maarten Bodewes♦ 56.2k

0

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0

answers

14

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Decryption an arbitrary cipher with XOR and rotation

cryptanalysis xor

modified 4 hours ago Maarten Bodewes♦ 56.2k

3

votes

1

answer

88

views

Von Neumann Extractor - Which bit is retained?

randomness entropy

answered 4 hours ago kodlu 9,451

0

votes

1

answer

56

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How to do division using Beaver Multiplication Triples

multiparty-computation

modified 5 hours ago Community♦ 1

1

vote

1

answer

22

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Does it matter if I publish only publish good or bad hashes after recovering from a hack?

hash md5 integrity

modified 5 hours ago Squeamish Ossifrage 23.4k

0

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0

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19

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Can Shamir's SSS be augmented so that having the secret as well as half the shares necessary to construct the secret is enough to reconstruct the key?

asked 6 hours ago cplusplusguru 1

1

vote

1

answer

36

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Does a different exponent and base but same key help to resolve discrete logarithm?

cryptanalysis discrete-logarithm attack

answered 6 hours ago poncho 94.8k

3

votes

1

answer

758

views

Can we hide a text first in a picture and then hide that image again in one more image?

encryption steganography

modified 12 hours ago Ella Rose♦ 17.1k

2

votes

0

answers

34

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How does post quantum key exchange in OpenSSH 8 work?

elliptic-curves diffie-hellman post-quantum-cryptography

asked 12 hours ago xkcd 166

0

votes

0

answers

26

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Decentralized / Distributed Private Key Generation between Untrusted Parties?

public-key key-exchange multiparty-computation key-distribution distributed-decryption

modified 13 hours ago Questioner 101

0

votes

1

answer

51

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How to define the statistical distance between two probabilistic algorithms?

distinguisher

modified 13 hours ago TeamBright 316

1

vote

1

answer

58

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Signal Protocol - Counter over TCP?

key-derivation signal-protocol

modified 14 hours ago A. Hersean 210

4

votes

1

answer

119

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How to define the statistical distance between two functions?

distinguisher

modified 16 hours ago TeamBright 316

1

vote

2

answers

73

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RSA padding: risk of using constants

rsa

modified 18 hours ago S. L. 104

2

votes

1

answer

46

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Share secret non-interactively in a verifiable way

modified 18 hours ago Markus Knecht 43

2

votes

2

answers

43

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Shamir's secret sharing for vectors

answered 19 hours ago grees 31

1

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0

answers

20

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What's the main difference between the non-uniform probabilistic polynomial-time adversary and the probabilistic polynomial-time adversary? [duplicate]

provable-security

asked 19 hours ago Z.P. 56

1

vote

1

answer

48

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Reverse the order of encryption and decryption in CBC mode. Does this work?

cbc

answered 20 hours ago dhe25519 51

0

votes

0

answers

21

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Problem with Chaum`s Untraceable Electronic Cash

modular-arithmetic prime-numbers number-theory

modified 20 hours ago AleksanderRas 3,119

0

votes

2

answers

99

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Can block ciphers encrypt messages larger than the key length?

aes block-cipher

modified 20 hours ago AleksanderRas 3,119

4

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2

answers

588

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Using Lattice-based cryptography for TLS\SSL

rsa elliptic-curves tls lattice-crypto

modified 22 hours ago Todd 129

0

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0

answers

14

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How users are in control of their funds? [on hold]

cryptocurrency

asked yesterday Sina Nouri 1

0

votes

1

answer

39

views

Why public key has two parts in my secure messaging client similar to signal

public-key elliptic-curves diffie-hellman

modified yesterday Community♦ 1

0

votes

0

answers

12

views

How to forge a Proof-of-Stake blockchain?

cryptocurrency proof-of-work

asked yesterday CryptoLover 432

3

votes

3

answers

110

views

A hash function for sets that from a hash of a set and a subset of it doesn't reveal the hash of the remaining elements in the set

hash commutative-encryption

answered yesterday Marc Ilunga 452

0

votes

1

answer

144

views

Authentication and integrity

authentication integrity man-in-the-middle

modified yesterday Community♦ 1

2

votes

2

answers

56

views

Meaning of epsilon in proving a PRG is predictable/ un predictable

stream-cipher pseudo-random-generator

modified yesterday Squeamish Ossifrage 23.4k

3

votes

1

answer

701

views

How can I calculate the entropy of an image? [on hold]

entropy

answered yesterday Mike Pritchard 7

1

vote

0

answers

30

views

Maximum security strength in bits of ISAAC cipher?

provable-security stream-cipher key-size

modified yesterday Maarten Bodewes♦ 56.2k

0

votes

1

answer

67

views

Convert affine to projective coordinates and vice versa in ECC?

elliptic-curves

modified yesterday Community♦ 1

0

votes

0

answers

18

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Security implications of an extra inner encrypt for a single block Matyas-Meyer-Oseas hash function

hash algorithm-design collision-resistance hash-signature

asked yesterday Adam Ierymenko 77

1

vote

1

answer

38

views

How can I get select messages ciphers for salsa20poly1305 for unit tests?

encryption authentication salsa20 poly1305 test-vectors

modified yesterday Maarten Bodewes♦ 56.2k

4

votes

3

answers

8k

views

Chosen plaintext vs Chosen ciphertext

chosen-plaintext-attack chosen-ciphertext-attack

answered yesterday Ahmadreza Sezavar 1

-1

votes

2

answers

46

views

How to find at least one private key from a large list of compressed public keys secp256k1

public-key elliptic-curves diffie-hellman keys cryptocurrency

modified yesterday Maarten Bodewes♦ 56.2k

0

votes

0

answers

53

views

How to compute a discrete logarithm modulo a power of 2?

discrete-logarithm

modified yesterday Ilmari Karonen 36k

1

vote

0

answers

37

views

Are there a way to progress or age key pairs

keys x25519

modified yesterday Håkan Olsson 6

0

votes

1

answer

41

views

Computing a sextic twist

elliptic-curves finite-field pairings

answered yesterday Razvan Ursu 11

1

vote

1

answer

56

views

SHA256 message schedule examples

hash sha-256

modified yesterday Maarten Bodewes♦ 56.2k

1

vote

1

answer

42

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Check if two ed25519 points are equivalent

elliptic-curves ed25519

modified yesterday Frank Denis 947

0

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2

answers

53

views

Who can create a MAC? Who can verify a MAC?

mac

answered yesterday grees 31

-2

votes

1

answer

183

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Creating new cryptographic algorithm instead of using known algorithm [duplicate]

encryption

modified yesterday Ilmari Karonen 36k

1

vote

0

answers

31

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Efficient fields over arithmetic circuits

modular-arithmetic finite-field number-theory circuit

modified yesterday kelalaka 9,020

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