User Henno Brandsma

1 vote

Apply a permutation cipher by hand

answered Feb 9, 2017 at 2:40

1 vote

SHA3 256 bit encryption

answered Dec 28, 2016 at 14:06

0 votes

What type of cipher or encryption method is this called?

answered Dec 3, 2016 at 12:35

3 votes

Implementing AES-CBC (Matasano Crypto Challenge 10)

answered Dec 1, 2015 at 19:47

2 votes

Accepted

Where is the mistake in my RSA by-hand calculation?

answered May 1, 2016 at 6:47

3 votes

Accepted

Deriving 256-bit key from PBKDF2-SHA1

answered Apr 19, 2016 at 18:06

1 vote

Accepted

Finding d given everything else in RSA

answered Mar 20, 2016 at 6:34

17 votes

Why is PuTTYgen-created RSA public exponent(e) not in {3,17,65537}?

answered Nov 25, 2015 at 15:56

0 votes

Accepted

How to create and validate potential grids when attacking a Playfair cipher?

answered Feb 21, 2016 at 16:26

2 votes

How to break Universal Re-Encryption algorithm?

answered Feb 6, 2016 at 12:34

9 votes

What are the main weaknesses of a Playfair cipher, if any?

answered Oct 1, 2012 at 21:44

8 votes

AES Inverse Key Schedule

answered Dec 22, 2015 at 18:32

5 votes

Accepted

Message exchange with textbook RSA

answered Dec 12, 2015 at 13:09

3 votes

Accepted

Attack on textbook RSA with small messages

answered Dec 12, 2015 at 10:08

2 votes

Accepted

Different tools return different ciphertext value for equal input

answered Dec 8, 2015 at 11:11

3 votes

Accepted

How to verify CA certificate from Yubico with openssl?

answered Dec 2, 2015 at 22:47

3 votes

Accepted

help understanding part of Wiener's attack on RSA w/ small d

answered Dec 2, 2015 at 22:10

4 votes

Accepted

Problem reproducing AES results

answered Nov 29, 2015 at 8:33

5 votes

How can I use the whole potential of DES?

answered Nov 27, 2015 at 10:28

2 votes

Breaking a Modified Caesar Cipher

answered Nov 22, 2015 at 6:35

1 vote

Factorizing N to derive D

answered Nov 16, 2015 at 19:26

3 votes

Diffie-Hellman using a different modulus on both sides

answered Nov 8, 2015 at 14:42

6 votes

Accepted

Why is the XOR of plaintexts equal to the XOR of ciphertexts with a two time pad?

answered Nov 8, 2015 at 13:14

3 votes

How were semagrams encrypted in the pre-digital era?

answered Oct 26, 2015 at 13:34

0 votes

Find plaintext from two ciphers encrypted with a one-time pad and the same key

answered Oct 26, 2015 at 13:25

1 vote

Accepted

Decrypted RSA 64 bit encryption using modulus and private exponent. Got gobbledygook [Verify]

answered Apr 6, 2015 at 17:41

3 votes

Is it secure to transmit a short plaintext with its MAC?

answered Mar 26, 2015 at 8:50

1 vote

NTRU Encryption

answered Mar 26, 2015 at 8:35

2 votes

Cycles in SHA-256

answered Mar 25, 2015 at 8:40

2 votes

encryption of message "DATACONFANTIALITY" with key playfair using playfair cipher

answered Feb 23, 2015 at 18:10

Stack Exchange Network

121 Answers

Apply a permutation cipher by hand

SHA3 256 bit encryption

What type of cipher or encryption method is this called?

Implementing AES-CBC (Matasano Crypto Challenge 10)

Where is the mistake in my RSA by-hand calculation?

Deriving 256-bit key from PBKDF2-SHA1

Finding d given everything else in RSA

Why is PuTTYgen-created RSA public exponent(e) not in {3,17,65537}?

How to create and validate potential grids when attacking a Playfair cipher?

How to break Universal Re-Encryption algorithm?

What are the main weaknesses of a Playfair cipher, if any?

AES Inverse Key Schedule

Message exchange with textbook RSA

Attack on textbook RSA with small messages

Different tools return different ciphertext value for equal input

How to verify CA certificate from Yubico with openssl?

help understanding part of Wiener's attack on RSA w/ small d

Problem reproducing AES results

How can I use the whole potential of DES?

Breaking a Modified Caesar Cipher

Factorizing N to derive D

Diffie-Hellman using a different modulus on both sides

Why is the XOR of plaintexts equal to the XOR of ciphertexts with a two time pad?

How were semagrams encrypted in the pre-digital era?

Find plaintext from two ciphers encrypted with a one-time pad and the same key

Decrypted RSA 64 bit encryption using modulus and private exponent. Got gobbledygook [Verify]

Is it secure to transmit a short plaintext with its MAC?

NTRU Encryption

Cycles in SHA-256

encryption of message "DATACONFANTIALITY" with key playfair using playfair cipher