User fadedbee

5 votes

2 answers

1k views

Are curve secp256k1 ECDSA signatures distinguishable from random data?

asked Nov 21 at 7:43

1 vote

1 answer

68 views

Equality between encrypted hash of data and hash of encrypted data?

asked Oct 13 at 12:52

0 votes

0 answers

31 views

Reorderable encryptions [duplicate]

asked Oct 13 at 13:04

2 votes

1 answer

94 views

Does using only one sign of secp256k1 publc keys weaken security?

asked Aug 22 at 7:49

3 votes

1 answer

235 views

Does ECDH on secp256k produce a defined shared secret for two key pairs, or is it implementation defined?

asked Jul 24 at 15:10

1 vote

1 answer

89 views

Is there any point in extending an 80-bit key before using it for HMAC-SHA256?

asked Dec 14, 2022 at 8:55

18 votes

2 answers

11k views

Deterministically generate a RSA public/private key pair from a passphrase (with sufficient entropy)?

asked Mar 19, 2015 at 10:57

3 votes

1 answer

553 views

Elliptic curves on finite fields

asked Jan 18, 2019 at 13:03

1 vote

2 answers

225 views

Is it safe to sign message with a TLS private key?

asked Mar 23, 2022 at 13:02

0 votes

1 answer

234 views

How to use OpenSSL to prove non-repudiation

asked Mar 21, 2022 at 8:50

1 vote

0 answers

752 views

AES256-GCM Is it safe to both add the IV to the AAD and use it in the encryption?

asked Jan 28, 2022 at 11:00

2 votes

2 answers

2k views

Is there a relationship between the secp256k1 public key of the sum of two private keys, and the public keys of those original two private keys?

asked Sep 2, 2020 at 13:25

2 votes

1 answer

222 views

What is the maths behind Bitcoin's BIP32?

asked Jul 2, 2020 at 21:46

3 votes

3 answers

323 views

Can you create an encryption algorithm from a signing algorithm, or vice versa?

asked Jun 23, 2021 at 11:14

2 votes

1 answer

391 views

Do some Block Cipher Modes encrypt the nonce and then XOR it with the data?

asked Jun 2, 2021 at 12:30

0 votes

0 answers

95 views

Security of SecretKey addition and PublicKey multiplication in secp256k1

asked Apr 24, 2021 at 7:07

1 vote

1 answer

433 views

AES-128 or AES-256 with 18 bytes of key storage?

asked Jan 16, 2021 at 11:37

1 vote

2 answers

728 views

Does the Blake3 hash have identities, due to its merkle tree structure?

asked Nov 27, 2020 at 6:23

1 vote

0 answers

116 views

Is it OK to use a doubled key for XTS-AES?

asked Nov 19, 2020 at 12:18

1 vote

3 answers

285 views

Using sha3 as a deterministic source of psuedo-random bytes for xor encryption

asked Sep 19, 2020 at 6:56

0 votes

1 answer

741 views

If you know the messages, and the results of HMAC(key, message) can you find the key?

asked Feb 23, 2015 at 13:07

3 votes

2 answers

1k views

Is it safe to XOR-combine hashes by rotating them first?

asked Aug 7, 2020 at 7:10

0 votes

0 answers

188 views

Is there a relation between the private keys of secp256k1 public keys of opposite parities?

asked Aug 1, 2020 at 10:51

2 votes

2 answers

54 views

Does selectively generating keypairs with particular public-key hash prefix weaken the security?

asked Jul 23, 2020 at 20:14

2 votes

1 answer

85 views

What is the best way of deterministically choosing N of M, given 32 bytes of sha256?

asked Jul 13, 2020 at 21:17

0 votes

0 answers

48 views

Are there any hashing functions where you can perform operations on the hashes without knowing the source data?

asked Apr 3, 2020 at 13:59

3 votes

3 answers

3k views

Any weakness when performing SHA-256 repeatedly? [duplicate]

asked Sep 30, 2014 at 12:18

5 votes

1 answer

2k views

Do aes_256_gcm IVs just need to be unique for that key?

asked Apr 19, 2018 at 11:57

1 vote

1 answer

180 views

Can sending the same plaintext twice, each encrypted with different key and IV, weaken the encryption?

asked Mar 22, 2018 at 11:20

1 vote

1 answer

1k views

What is best practise for salting and multiple-hashing of passwords?

asked Nov 17, 2017 at 9:11

Stack Exchange Network

42 Questions

Are curve secp256k1 ECDSA signatures distinguishable from random data?

Equality between encrypted hash of data and hash of encrypted data?

Reorderable encryptions [duplicate]

Does using only one sign of secp256k1 publc keys weaken security?

Does ECDH on secp256k produce a defined shared secret for two key pairs, or is it implementation defined?

Is there any point in extending an 80-bit key before using it for HMAC-SHA256?

Deterministically generate a RSA public/private key pair from a passphrase (with sufficient entropy)?

Elliptic curves on finite fields

Is it safe to sign message with a TLS private key?

How to use OpenSSL to prove non-repudiation

AES256-GCM Is it safe to both add the IV to the AAD and use it in the encryption?

Is there a relationship between the secp256k1 public key of the sum of two private keys, and the public keys of those original two private keys?

What is the maths behind Bitcoin's BIP32?

Can you create an encryption algorithm from a signing algorithm, or vice versa?

Do some Block Cipher Modes encrypt the nonce and then XOR it with the data?

Security of SecretKey addition and PublicKey multiplication in secp256k1

AES-128 or AES-256 with 18 bytes of key storage?

Does the Blake3 hash have identities, due to its merkle tree structure?

Is it OK to use a doubled key for XTS-AES?

Using sha3 as a deterministic source of psuedo-random bytes for xor encryption

If you know the messages, and the results of HMAC(key, message) can you find the key?

Is it safe to XOR-combine hashes by rotating them first?

Is there a relation between the private keys of secp256k1 public keys of opposite parities?

Does selectively generating keypairs with particular public-key hash prefix weaken the security?

What is the best way of deterministically choosing N of M, given 32 bytes of sha256?

Are there any hashing functions where you can perform operations on the hashes without knowing the source data?

Any weakness when performing SHA-256 repeatedly? [duplicate]

Do aes_256_gcm IVs just need to be unique for that key?

Can sending the same plaintext twice, each encrypted with different key and IV, weaken the encryption?

What is best practise for salting and multiple-hashing of passwords?