Cryptography Stack Exchange

2

votes

3

answers

447

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How to decide if a point on a elliptic curve belongs to a group generated by a generator g?

modified 42 mins ago Ievgeni 1,719

4

votes

1

answer

108

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Weak Decisional Diffie-Hellman Problem

diffie-hellman hardness-assumptions

modified 1 hour ago Ievgeni 1,719

0

votes

1

answer

38

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Where can I find good practice questions for proofs by reduction?

provable-security key-exchange mac reference-request pseudo-random-function

modified 1 hour ago Ievgeni 1,719

2

votes

1

answer

44

views

How to have a hash function that maps any binary string of size n to binary string of size n?

hash pairings

modified 1 hour ago Maarten Bodewes♦ 81.8k

3

votes

3

answers

285

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Composition of cryptographic hash functions

hash collision-resistance

modified 1 hour ago kelalaka 38.4k

0

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2

answers

43

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The number of odd integers we have to test until to find one that is a prime for any arbitrary RSA modulus size

rsa prime-numbers

modified 2 hours ago tylo 12.1k

0

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0

answers

14

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Decrypt AES-128-CBC encypted partial RSA Key

rsa public-key cbc decryption

asked 2 hours ago BenjyTec 101

1

vote

1

answer

122

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Combined scheme security proof

public-key provable-security security-definition random-oracle-model

modified 3 hours ago Ievgeni 1,719

6

votes

1

answer

581

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+50

Are SSH key-pairs an example of a zero knowledge proof?

encryption authentication zero-knowledge-proofs authenticated-encryption ssh

modified 5 hours ago Lieu Zheng Hong 51

2

votes

1

answer

24

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How is MitM attack prevented when complete session is hijacked?

authentication challenge-response

modified 6 hours ago knaccc 862

1

vote

0

answers

101

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Can a series of attached tetrahedrons be used for cryptography?

algorithm-design complexity

modified 6 hours ago J. Doe 681

0

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0

answers

24

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How does the simulator generate a correct transcript under HVZK with the Fiat-Shamir heuristic?

encryption zero-knowledge-proofs random-oracle-model fiat-shamir

asked 7 hours ago Lieu Zheng Hong 51

0

votes

1

answer

102

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One way text→text function

format-preserving deterministic-encryption

modified 8 hours ago yyyyyyy 10.8k

-1

votes

0

answers

16

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Strategic alternatives to passwords in the information systems

passwords quantum-cryptography quantum-computing

asked 9 hours ago Ruben Kazumov 99

1

vote

0

answers

16

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Indistinguishability versus Indifferentiability

block-cipher feistel-network indistinguishability

asked 10 hours ago Novice_researcher 415

5

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4

answers

274

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What does perfect mean within perfect forward secrecy and why do some cryptographers disagree with the term?

terminology security-definition forward-secrecy

modified 11 hours ago CommunityBot 1

0

votes

0

answers

22

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properties of hash functions [closed]

hash collision-resistance output-size

modified 14 hours ago Kuba Chrabański 131

0

votes

0

answers

12

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Is it possible to construct a 1-out-of-N OT with communication complexity smaller than the sender's whole input?

multiparty-computation complexity oblivious-transfer

modified 15 hours ago Ivan 1

3

votes

2

answers

343

views

Comparison of security definitions for signatures

rsa signature dsa security-definition

answered 16 hours ago killertoge 175

2

votes

1

answer

51

views

Prove: If there exist strong OWFs then there exist weak OWFs that aren't strong

one-way-function

answered 18 hours ago Mark 6,622

0

votes

0

answers

39

views

Bug Bounty for a reversed Hash

sha-256

asked 19 hours ago LeetSpeech 1

1

vote

1

answer

196

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How to choose secp256k1 private key?

elliptic-curves secp256k1

modified yesterday kelalaka 38.4k

4

votes

1

answer

347

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Formal Verification of DHKE protocol using ProVerif

diffie-hellman provable-security

modified yesterday CommunityBot 1

0

votes

2

answers

57

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hiding bits inside random bits, is this some sort of encryption?

encryption

answered yesterday Mark 6,622

2

votes

1

answer

45

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Is SHA1 break significant for an algorithm intended to be Proof-Of-Work?

hash sha-1 scrypt

modified yesterday kelalaka 38.4k

1

vote

1

answer

68

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

block-cipher

modified yesterday kelalaka 38.4k

1

vote

0

answers

42

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Is this kind of mutual Authentication safe?

authentication challenge-response

modified yesterday MichaelW 1,385

10

votes

1

answer

375

views

What are the current limitations (and capabilities) of Functional Encryption used for access control?

abe functional-encryption access-control

modified yesterday CommunityBot 1

3

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0

answers

50

views

Is it possible to have a shared secret without any party knowing all the parts?

1

vote

2

answers

116

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Can you identify these cryptographic algorithmic symbols?

hash notation ripemd

modified yesterday hunter 13

5

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3

answers

1k

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Update to "Cryptographic Right Answers"

encryption reference-request

answered yesterday Nathan Kidd 111

2

votes

1

answer

57

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Should I use HMAC to create a multiple part HASH token

hash authentication hmac sha-256

modified 2 days ago kelalaka 38.4k

1

vote

1

answer

191

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Timing attacks: Symmetric vs Asymmetric Algorithms

public-key symmetric side-channel-attack timing-attack

modified 2 days ago fgrieu♦ 119k

0

votes

1

answer

24

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How to prove that paillier encryption is positive (zero-knowledge)?

zero-knowledge-proofs paillier

answered 2 days ago poncho 126k

0

votes

0

answers

67

views

Unable to factorise the modulus from public key to extract a private key

rsa openssl

asked 2 days ago pee2pee 117

2

votes

1

answer

1k

views

Montgomery Exponentiation - selecting input value R for a given BigInteger

number-theory montgomery-multiplication

modified 2 days ago kelalaka 38.4k

30

votes

2

answers

12k

views

Is HMAC-DRBG or Hash-DRBG stronger?

hash random-number-generator

modified 2 days ago kelalaka 38.4k

8

votes

1

answer

407

views

Curve25519 Key Validation

elliptic-curves diffie-hellman key-exchange

modified 2 days ago kelalaka 38.4k

1

vote

0

answers

13

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SSH Server Configuration Best Practices? [migrated]

rsa sha-256 sha-1 sha-2 ssh

modified 2 days ago Swashbuckler 1,742

2

votes

0

answers

31

views

key reuse: does knowing H(S) reveal HMAC(S)

hmac hkdf

modified Dec 3 at 12:03 aep 121

1

vote

1

answer

216

views

What is a function on a Line or a Curve?

elliptic-curves pairings bilinear-pairing

modified Dec 3 at 8:45 Daniel S 6,761

2

votes

0

answers

34

views

Cyclical Redundancy Check and bijections [closed]

hash collision-resistance pseudo-random-generator encoding

asked Dec 3 at 7:51 user3084125 21

1

vote

0

answers

46

views

Current research problems in Lattice based Crypto [closed]

lattice-crypto

asked Dec 3 at 5:08 Saikat 137

0

votes

2

answers

76

views

what are security reductions of symmetric-key algorithms?

rsa public-key diffie-hellman symmetric one-way-function

modified Dec 2 at 23:25 nimrodel 11

0

votes

1

answer

217

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Why are public keys derived from elliptic curve cryptography (ECC) and not from hashing?

public-key post-quantum-cryptography cryptocurrency

modified Dec 2 at 21:46 fgrieu♦ 119k

0

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0

answers

44

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Double encrypted cipher involving polybius square [closed]

multiple-encryption

asked Dec 2 at 21:34 Elijah Moreira 1

4

votes

2

answers

158

views

Testing of PQC NIST round3 submissions

post-quantum-cryptography lattice-crypto nist cryptographic-hardware quantum-cryptography

answered Dec 2 at 19:24 Mark 6,622

0

votes

0

answers

63

views

Homomorphic Encryption Library Supporting Addition, Multiplication & Logical Shift

encryption homomorphic-encryption implementation reference-request

modified Dec 2 at 18:58 Ievgeni 1,719

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