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20 Questions

Views Newest Activity Votes

votes

answers

35k

views

Why hash the message before signing it with RSA?

Oct 11 '18 at 12:37 Md. Abu Nafee Ibna Zahid 103

votes

answer

views

Why use Needham-Schroeder if we have Diffie-Hellman?

diffie-hellman needham-schroeder

Jan 14 '14 at 1:53 jingyang 604

votes

answers

views

Why use a timestamp and how can someone know it's the correct one?

public-key signature timestamping

Dec 16 '13 at 23:02 rath 1,876

votes

answers

views

What happens when a root CA has its private key compromised?

public-key certificates pki

Nov 17 '13 at 2:37 Community♦ 1

votes

answers

857

views

Why have Nonce and why encrypt everything in step 2 for Needham-Schroeder?

public-key authentication needham-schroeder

Apr 27 '14 at 2:18 Community♦ 1

votes

answers

399

views

Can you really insert the text you want in one-time pad?

stream-cipher one-time-pad

Oct 28 '17 at 2:59 Caleb Paul 151

votes

answer

720

views

Why have 4th and 5th steps in Needham-Schroeder Protocol?

symmetric

Nov 14 '13 at 14:32 mikeazo 33.8k

votes

answers

views

What block cipher is used for CBC-MAC?

mac cbc cbc-mac

Dec 8 '14 at 5:33 Jacob E Mack 146

votes

answer

215

views

Why encrypting with private and public keys produce the same result?

rsa modular-arithmetic

Jan 8 '14 at 17:19 Community♦ 1

votes

answers

583

views

Can ECB mode really leak some characters?

authenticated-encryption ecb 3des

Nov 3 '13 at 12:19 figlesquidge 3,699

votes

answer

511

views

What kind of machine can generate 100-400 digits prime number? RSA

rsa

Oct 14 '13 at 17:35 Maarten Bodewes♦ 59k

votes

answers

views

How do we prove that AES, DES etc. are secure?

aes cryptanalysis des

Oct 7 '13 at 18:01 K.G. 3,962

vote

answers

views

Why not just generate random strings for one-time password (OTP)?

one-time-password

Nov 20 '13 at 17:41 e-sushi 14.2k

vote

answer

225

views

Why send a challenge with CHAP?

authentication challenge-response

Nov 18 '13 at 17:52 figlesquidge 3,699

vote

answer

616

views

I've got my private key compromised. How does CRL work?

public-key certificates pki crl

Nov 15 '13 at 9:33 Community♦ 1

vote

answer

views

How can we get CA's public key?

public-key certificates pki

Nov 13 '13 at 23:07 Community♦ 1

vote

answer

260

views

Why routers don't just use Diffie-Hellman protocol?

diffie-hellman

Nov 13 '13 at 22:32 user2813687 207

vote

answers

606

views

Does MAC provide origin authentication? Why not just use symmetric encryption?

symmetric mac

Oct 20 '13 at 19:19 Ilmari Karonen 38.5k

votes

answers

285

views

Why does DSS have such formulas?

dsa

Jan 9 '14 at 15:18 tylo 10.7k

votes

answers

views

Why use CBC-MAC? Why not just apply hash function on the whole message?

cbc-mac

Jan 7 '14 at 19:21 user4982 4,714

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20 Questions

Why hash the message before signing it with RSA?

Why use Needham-Schroeder if we have Diffie-Hellman?

Why use a timestamp and how can someone know it's the correct one?

What happens when a root CA has its private key compromised?

Why have Nonce and why encrypt everything in step 2 for Needham-Schroeder?

Can you really insert the text you want in one-time pad?

Why have 4th and 5th steps in Needham-Schroeder Protocol?

What block cipher is used for CBC-MAC?

Why encrypting with private and public keys produce the same result?

Can ECB mode really leak some characters?

What kind of machine can generate 100-400 digits prime number? RSA

How do we prove that AES, DES etc. are secure?

Why not just generate random strings for one-time password (OTP)?

Why send a challenge with CHAP?

I've got my private key compromised. How does CRL work?

How can we get CA's public key?

Why routers don't just use Diffie-Hellman protocol?

Does MAC provide origin authentication? Why not just use symmetric encryption?

Why does DSS have such formulas?

Why use CBC-MAC? Why not just apply hash function on the whole message?