User fadedbee

5 votes

2 answers

1k views

Are curve secp256k1 ECDSA signatures distinguishable from random data?

asked Nov 21 at 7:43

0 votes

0 answers

31 views

Reorderable encryptions [duplicate]

asked Oct 13 at 13:04

1 vote

1 answer

68 views

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

asked Oct 13 at 12:52

2 votes

1 answer

93 views

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

asked Aug 22 at 7:49

3 votes

1 answer

233 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

88 views

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

asked Dec 14, 2022 at 8:55

1 vote

2 answers

223 views

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

asked Mar 23, 2022 at 13:02

0 votes

1 answer

229 views

How to use OpenSSL to prove non-repudiation

asked Mar 21, 2022 at 8:50

1 vote

0 answers

745 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

3 votes

3 answers

318 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

389 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

431 views

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

asked Jan 16, 2021 at 11:37

1 vote

2 answers

725 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

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

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

184 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

2 votes

1 answer

222 views

What is the maths behind Bitcoin's BIP32?

asked Jul 2, 2020 at 21:46

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

1 answer

548 views

Elliptic curves on finite fields

asked Jan 18, 2019 at 13:03

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

1 vote

2 answers

840 views

Need for secure hash function for a bloom filter

asked Nov 1, 2017 at 12:11

4 votes

2 answers

568 views

Cryptographically strong seeded pseudo random number generator

asked Sep 7, 2017 at 7:54

1 vote

1 answer

2k views

How to find the secret key and nonce from two messages encrypted using the same nonce?

asked Jul 11, 2017 at 21:35

Stack Exchange Network

42 Questions

Are curve secp256k1 ECDSA signatures distinguishable from random data?

Reorderable encryptions [duplicate]

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

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?

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?

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

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?

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?

What is the maths behind Bitcoin's BIP32?

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

Elliptic curves on finite fields

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?

Need for secure hash function for a bloom filter

Cryptographically strong seeded pseudo random number generator

How to find the secret key and nonce from two messages encrypted using the same nonce?