Cryptography Stack Exchange is a question and answer site for software developers, mathematicians and others interested in cryptography. Join them; it only takes a minute:

Sign up

Here's how it works:

Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top

Top Questions

active 1 featured hot week month

2

votes

2

answers

174

views

What is the name of an attack where the compromise of one key compromises the whole system?

encryption cryptanalysis provable-security attack

modified 1 hour ago fgrieu 74.4k

0

votes

0

answers

24

views

Public-only KDF

elliptic-curves key-derivation hkdf

modified 3 hours ago valdo 147

0

votes

0

answers

15

views

Cryptanalysis for a monoalphabetic substitution cipher

cryptanalysis substitution-cipher playfair

asked 6 hours ago vlex 1

0

votes

0

answers

48

views

Is it possible to encrypt a process?

encryption

modified 20 mins ago user3303504 1

0

votes

0

answers

25

views

How does end to end encrypted emails work? [migrated]

encryption

modified 6 hours ago fgrieu 74.4k

1

vote

1

answer

18

views

How to encrypt sensitive files in a business application? Is it needed?

hash public-key key-derivation file-encryption

answered 8 hours ago kub0x 343

6

votes

1

answer

595

views

What does “seed” mean in cryptography?

pseudo-random-generator terminology

modified 23 hours ago Ilmari Karonen 32.8k

3

votes

1

answer

87

views

Zero Knowledge and Computational Indistinguishability

zero-knowledge-proofs

answered 18 hours ago Mikero 4,951

0

votes

1

answer

35

views

identifying Negligible functions

encryption chosen-plaintext-attack

modified 6 hours ago kelalaka 1,346

-1

votes

0

answers

33

views

Is this the correct way to crack a AES-256-CBC Encrypted file? [on hold]

cryptanalysis password-based-encryption aes256

asked 16 hours ago chrislbaird 1

1

vote

3

answers

242

views

Password re-use by another person or on another service

passwords salt

modified yesterday Saptarshi Basu 208

0

votes

2

answers

58

views

Digital signature providing a proof of file authenticity

signature

modified 17 hours ago kelalaka 1,346

3

votes

1

answer

48

views

Could we use a more efficient hash for signature generation?

hash signature algorithm-design lightweight

answered 18 hours ago mephisto 2,172

1

vote

1

answer

28

views

Problems understanding the applications of pseudo random number generators

randomness pseudo-random-generator

modified 20 hours ago Maarten Bodewes 49.9k

1

vote

0

answers

28

views

How to Prevent Correlation Power Analysis Attack on AES?

aes side-channel-attack

modified 21 hours ago Mr. Goferito 106

3

votes

4

answers

69

views

JWT Login Security

encryption authentication tls authenticated-encryption

modified 7 hours ago Nae 157

-1

votes

0

answers

28

views

What am I doing wrong with this Diffie - Hellman Key generation?

cryptanalysis diffie-hellman

modified 22 hours ago SEJPM♦ 27.3k

0

votes

0

answers

22

views

i want to know what programs can help me to test block cipher? [on hold]

block-cipher

asked 23 hours ago بدور الصيعري 1

0

votes

0

answers

32

views

How crack XOR cipher without key [on hold]

encryption xor

asked yesterday Poncjusz 1

16

votes

5

answers

3k

views

Is a PRG more costly than AES or any other encryption standard?

encryption keys one-time-pad

modified Oct 17 at 15:35 α CVn 193

1

vote

0

answers

22

views

HW wallet and multisignaters in ECC

elliptic-curves schnorr-signature

asked yesterday valdo 147

1

vote

1

answer

50

views

Is the simulation-based proof difficult and needed?

provable-security multiparty-computation security-definition adversarial-model

modified yesterday Shan Chen 915

1

vote

1

answer

45

views

Encrypting a 64-bit binary number to a text containing upper- and lowercase, and digits

encryption

modified yesterday kelalaka 1,346

0

votes

1

answer

59

views

CBC related TLS cipher suites to be disabled in the server side

tls cbc gcm ciphersuite

answered yesterday Saptarshi Basu 208

4

votes

1

answer

82

views

Are there any strong manual ciphers?

pen-and-paper

answered 2 days ago gusto2 974

4

votes

1

answer

70

views

Do I understand HMAC-SHA-xxx and HMAC-SHA-xxx-yyy correctly?

hmac

modified 2 days ago Maarten Bodewes 49.9k

1

vote

1

answer

16

views

Format of EC SubjectPublicKeyInfo

standards

modified yesterday Maarten Bodewes 49.9k

7

votes

2

answers

117

views

Regular and Efficient doubling in $GF(2^n)$

implementation modular-arithmetic

modified yesterday fgrieu 74.4k

0

votes

0

answers

37

views

How to break Content Scramble System at complexity of 2^16?

encryption

2 days ago Anh Đức Lương 1

3

votes

1

answer

53

views

Double DES meet in the middle attack: probability that wrong key pair remains

des meet-in-the-middle-attack

answered 2 days ago kodlu 7,914

2

votes

2

answers

29

views

Does the Server Key Exchange sign a hash or text

signature tls key-exchange hash-signature

answered 2 days ago dave_thompson_085 3,136

0

votes

1

answer

45

views

Does hashing an encrypted message suffer from any drawbacks?

encryption hash

answered 2 days ago Maarten Bodewes 49.9k

2

votes

1

answer

33

views

Why are computations (isogeny) in SIDH done in an extended prime field?

key-exchange post-quantum-cryptography isogeny

modified 2 days ago Ella Rose 14k

0

votes

1

answer

68

views

Newbie question: one-way functions in cryptography

encryption hash public-key one-way-function complexity

answered 2 days ago SEJPM♦ 27.3k

-1

votes

2

answers

38

views

Newbie - Hybrid Symetric and Asymetric

hybrid-encryption

answered 2 days ago Maarten Bodewes 49.9k

3

votes

2

answers

56

views

KDF Salt: How/When is it Okay for it to be public?

hash key-derivation pbkdf-2

modified yesterday aandotherchars 39

3

votes

1

answer

166

views

Is SHA1 secured enough as a PRNG

random-number-generator sha-256 sha-1 semantic-security

answered Oct 17 at 16:23 Maarten Bodewes 49.9k

0

votes

0

answers

66

views

Hamming distance of any vector to 2 different sets is a constant

coding-theory hamming

modified Oct 18 at 15:40 Thành Nguyễn Văn 7

3

votes

1

answer

63

views

Practical quantum attacks on AES - Is AES-128 used in a block mode vulnerable to attack using quantum algorithms

aes post-quantum-cryptography quantum-cryptography

modified 19 hours ago Maarten Bodewes 49.9k

1

vote

1

answer

34

views

what benefits quantum offer over classical parallelism

quantum-cryptography

modified 2 days ago kelalaka 1,346

-1

votes

0

answers

40

views

How to proof that this cipher is perfectly secure?

encryption cryptanalysis modular-arithmetic classical-cipher

modified 2 days ago SEJPM♦ 27.3k

0

votes

1

answer

43

views

Computing/using RSA modulus without knowing its factors

rsa protocol-design

answered Oct 18 at 13:35 Mikero 4,951

4

votes

0

answers

62

views

Patent Status & Usability of AE Modes [on hold]

encryption symmetric authenticated-encryption aes-gcm

modified Oct 18 at 13:09 Paul Uszak 6,266

2

votes

1

answer

69

views

Why RSA must make sure that $\gcd(e,\varphi(n)) = 1$ instead of $\gcd(e,n) = 1$?

rsa

modified Oct 18 at 6:12 fgrieu 74.4k

1

vote

0

answers

39

views

Applying Chinese RemainderTheorem and Paillier Homomorphic encryption

paillier

modified 2 days ago AleksanderRas 857

3

votes

2

answers

42

views

McEliece post quantum cryptography

cryptanalysis

modified Oct 17 at 19:54 Carl Löndahl 246

-3

votes

0

answers

28

views

the password is incorrect while its correct [on hold]

encryption

asked Oct 18 at 15:24 Hersi 1

2

votes

2

answers

332

views

Is there a symmetric cipher that is explicitly designed to be slow?

symmetric reference-request

modified 2 days ago kelalaka 1,346

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

Cryptography Stack Exchange works best with JavaScript enabled