Hottest Questions This Month

38

votes

10

answers

6k

views

What's the truth about this “absolutely unbreakable” cipher?

encryption snake-oil-cryptography

answered Dec 25 '19 at 18:43 foo yuk 1

30

votes

4

answers

4k

views

The GCD strikes back to RSA in 2019 - Good randomness is the only solution?

rsa random-number-generator

modified Jan 15 at 22:55 Maarten Bodewes♦ 66.2k

9

votes

4

answers

3k

views

Why is the Keyspace of a Substitution Cipher not 2^26 but 2^88

keys substitution-cipher

modified yesterday fgrieu 95.3k

9

votes

3

answers

6k

views

Is 128-bit security still considered strong in 2020, within the context of both ECC Asym & Sym ciphers

public-key symmetric provable-security

modified Jan 14 at 21:06 deep spook 1

8

votes

4

answers

7k

views

How hard is it to guess a 8 digit PIN?

encryption passwords entropy

modified yesterday jcaron 133

16

votes

1

answer

4k

views

In 2020, SHA-1 practically broken in chosen-prefix collision (CP-collision). Can double SHA-1 hashing prevent CP-collision?

hash collision-resistance sha-1

modified Jan 8 at 20:23 kelalaka 15.7k

1

vote

3

answers

2k

views

Has AES-128 been fully broken?

aes

modified Jan 15 at 21:14 kelalaka 15.7k

12

votes

4

answers

3k

views

Why are good passwords required if we use good hashing algorithms?

password-hashing

answered Dec 20 '19 at 20:26 H. Idden 161

8

votes

2

answers

1k

views

Why does SSH authentication protocol send a challenge message instead of using digital signature to verify client

signature ssh

modified Dec 27 '19 at 8:50 thesquaregroot 362

5

votes

2

answers

2k

views

Is using 7-8 random words from all words of a language as password a good idea?

encryption passwords

modified 2 days ago kelalaka 15.7k

8

votes

2

answers

692

views

Perfect shuffle possible with limited raw entropy?

random-number-generator randomness pseudo-random-generator

modified Dec 31 '19 at 16:12 fgrieu 95.3k

0

votes

3

answers

251

views

How secure is XOR-CBC?

encryption xor

modified Jan 4 at 1:09 Maarten Bodewes♦ 66.2k

5

votes

2

answers

677

views

During padding oracle attack (CBC), how is first byte of plaintext block is obtained?

cbc padding-oracle

modified Dec 30 '19 at 18:32 kelalaka 15.7k

3

votes

2

answers

680

views

Is direct RSA encryption of AES keys secure?

encryption rsa aes attack decryption

modified Jan 6 at 19:57 SEJPM♦ 36.5k

2

votes

3

answers

592

views

Does the Initialization Vector in DES have to be 8 bytes long?

des initialization-vector

modified Jan 6 at 11:20 kelalaka 15.7k

4

votes

1

answer

547

views

Multiple AES Key Derivation from a master key

encryption hash aes key-derivation hkdf

modified Dec 24 '19 at 13:33 kelalaka 15.7k

7

votes

4

answers

227

views

Can I replace SHA-1 with SHA-512/160 to address Shambles?

hash collision-resistance sha-1

answered Jan 12 at 5:38 Meir Maor 7,059

10

votes

1

answer

167

views

Minimizing exchanges for ZK proof of a message with given SHA-256

hash zero-knowledge-proofs sha-256

modified Jan 15 at 17:20 Geoffroy Couteau 11.7k

2

votes

3

answers

148

views

Can DNA computing to solve elliptic curve algorithms using this method

elliptic-curves

modified Jan 14 at 8:37 fgrieu 95.3k

3

votes

1

answer

164

views

RSA: If the least significant bits of the factors are leaked, what advantage is there in factoring N?

rsa prime-numbers factoring

modified Jan 4 at 12:11 kelalaka 15.7k

1

vote

3

answers

72

views

Why use an OTP if you already have a secure channel

perfect-secrecy otp

answered Dec 24 '19 at 17:29 Luis Casillas 11.2k

2

votes

1

answer

80

views

Is more ECDHE or RSA currently recommended?

encryption

modified Jan 2 at 22:04 kelalaka 15.7k

0

votes

2

answers

159

views

Post-Quantum cryptography usability in IoT devices

quantum-computing

modified Jan 13 at 7:59 fgrieu 95.3k

1

vote

2

answers

121

views

What encryption to choose from the SSL library in python 3?

encryption tls

modified Jan 4 at 17:17 kelalaka 15.7k

4

votes

1

answer

137

views

Is double encryption really a bad idea? Are meet-in-the-middle attacks practical at all?

aes elliptic-curves brute-force-attack attack meet-in-the-middle-attack

modified Dec 27 '19 at 23:32 fgrieu 95.3k

2

votes

2

answers

80

views

Why does a nonce prevent a replay attack?

authentication nonce

answered Jan 7 at 16:43 tylo 11.2k

0

votes

1

answer

101

views

Is encrypting a file with AES-CTR and then encrypting the AES key with RSA-4096 secure?

aes

modified Jan 12 at 11:45 AleksanderRas 5,275

3

votes

2

answers

97

views

Is the RSA cipher alike to the Shift/Caesar cipher?

rsa

modified Jan 14 at 15:55 fgrieu 95.3k

3

votes

3

answers

120

views

How do I verify a message came from me?

signature

modified Jan 13 at 16:37 Lery 5,049

1

vote

1

answer

69

views

What is the use of encoding a hash output?

sha-256 sha-1 md5

modified Jan 9 at 17:38 fgrieu 95.3k

6

votes

1

answer

146

views

Sigma protocol when order is unknown

zero-knowledge-proofs number-theory

modified Jan 14 at 13:12 Geoffroy Couteau 11.7k

1

vote

2

answers

145

views

The importance of randomness in the creation of a key

encryption random-number-generator randomness key-generation

modified Jan 1 at 11:19 mentallurg 431

-1

votes

2

answers

104

views

Which character / byte to use to divide AES ciphertext into chuncks?

aes rijndael

modified Dec 28 '19 at 11:16 Maarten Bodewes♦ 66.2k

1

vote

1

answer

80

views

Does adding OWF of the private key to encryption scheme hurts security?

encryption one-way-function semantic-security

modified Dec 25 '19 at 1:37 Mikero 6,476

1

vote

1

answer

102

views

Key space math clarification

keys

modified Jan 7 at 15:26 fgrieu 95.3k

2

votes

1

answer

100

views

Finding a pair of exponents so that $c^a \bmod N = c^b \bmod N$

rsa modular-arithmetic

modified Dec 29 '19 at 10:24 fgrieu 95.3k

0

votes

2

answers

60

views

PRNG next bit test

encryption random-number-generator nist

answered Jan 10 at 21:48 kodlu 11.2k

3

votes

2

answers

77

views

Multiple (RSA) public key encryption how to verify others received the same information? Non-deterministic encryption

encryption rsa public-key deterministic-encryption

modified Jan 3 at 21:10 poncho 103k

1

vote

1

answer

124

views

What are easy yet fool proof ways of ensuring that AES encryption algorithm works like it should and no bugs/developer mistakes have sneaked in?

encryption aes cbc rijndael

modified Dec 30 '19 at 17:57 kelalaka 15.7k

2

votes

1

answer

72

views

Create a ciphertext that decrypt to different plaintexts with different keys in RSA

encryption rsa

modified 10 hours ago fgrieu 95.3k

1

vote

1

answer

70

views

Double 3DES/TDES Encryption

tls encryption openssl des

modified Jan 10 at 10:58 Maarten Bodewes♦ 66.2k

1

vote

1

answer

87

views

Any good links to learn the maths behind AES?

aes resources

modified Jan 4 at 2:11 kodlu 11.2k

1

vote

1

answer

86

views

Using RSA public key as private key and vice-versa

rsa public-key

modified Jan 7 at 11:27 fgrieu 95.3k

4

votes

1

answer

66

views

Would using perfect S-boxes in F function of an unbalanced Feistel network produce a simple and secure cipher?

block-cipher s-boxes feistel-network

modified Dec 24 '19 at 2:21 kodlu 11.2k

2

votes

1

answer

62

views

Which padding is used for sha256WithRSAEncryption (1.2.840.113549.1.1.11), deterministic or random?

rsa signature padding pkcs1 cms

modified Jan 2 at 11:16 Maarten Bodewes♦ 66.2k

0

votes

1

answer

79

views

How to make an AES implementation using lookup tables immune to cache timing attacks?

aes timing-attack

modified Jan 12 at 20:03 fgrieu 95.3k

1

vote

2

answers

61

views

AES CBC in need of multiple IV's, possible to avoid creating duplicate iv's by using resulting cipher text 16 bytes as next iv?

encryption aes cbc

modified Dec 27 '19 at 17:21 Luis Casillas 11.2k

1

vote

1

answer

58

views

Iterated AES encryption under a fixed key

aes permutation

modified Dec 28 '19 at 12:12 kodlu 11.2k

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