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Cryptography

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Share a link to a post later visited by 25 unique IP addresses. This badge can be awarded multiple times.
Awarded 758 times.
Security of Pohlig-Hellman exponentation cipher?
Awarded Nov 27 at 10:20
How do non-"resident" keys work in WebAuthn?
Awarded Nov 26 at 11:50
Security levels in NIST Post-quantum project: e.g. AES-128 vs SHA-256
Awarded Nov 17 at 0:11
Has AES-128 been fully broken?
Awarded Nov 5 at 1:35
How can I use asymmetric encryption, such as RSA, to encrypt an arbitrary length of plaintext?
Awarded Oct 27 at 6:49
How does recovering the public key from an ECDSA signature work?
Awarded Oct 23 at 18:04
What tests can I do to ensure my random number generator is working correctly?
Awarded Oct 18 at 15:23
Is there are a metric based on collisions to compare bad hash functions?
Awarded Oct 17 at 4:11
How often does RSA-OAEP have a leading zero?
Awarded Oct 15 at 15:27
Polynomial-time Quantum Algorithms for Lattice Problems
Awarded Oct 15 at 7:33
Provable Encryption
Awarded Oct 15 at 1:52
During padding oracle attack (CBC), how is first byte of plaintext block is obtained?
Awarded Oct 15 at 0:13
ElGamal with elliptic curves
Awarded Oct 11 at 20:16
What are the consequences of removing a single byte from a sha256 hash?
Awarded Oct 11 at 7:08
What is the point at infinity on secp256k1 and how to calculate it?
Awarded Oct 9 at 22:00
Are there any Secp256k1 ECDSA test examples available?
Awarded Oct 2 at 22:40
Is H(k||length||x) a secure MAC construction?
Awarded Oct 2 at 5:58
Edwards / Montgomery ECC with Weierstrass Implementation?
Awarded Oct 1 at 16:53
CBC key lifetime, or, "how big is too big?"
Awarded Sep 30 at 18:08
Has SHA256 been broken by Treadwell Stanton DuPont?
Awarded Sep 29 at 2:49
Encrypting small values with RSA private key
Awarded Sep 17 at 9:15
Best way to reduce chance of hash collisions: Multiple hashes, or larger hash?
Awarded Sep 7 at 12:05
Post-Quantum secure KEM with CCA security without using PKE
Awarded Aug 30 at 14:28
Cycles in SHA-256
Awarded Aug 21 at 4:42
Twofish fails Dieharder test
Awarded Jul 15 at 23:18
Padding oracle attack, encrypting your own message
Awarded Jul 10 at 3:45
Assuming a 1024qb quantum computer, how long to brute force 1024bit RSA, 256bit AES and 512bit SHA512
Awarded Jun 18 at 9:06
In textbook RSA with low public exponent, how big does a random message needs to be?
Awarded Jun 16 at 15:46
How can I calculate the SHA-256 "midstate"?
Awarded May 26 at 21:07
Multiplicative inverse in $\operatorname{GF}(2^8)$?
Awarded May 24 at 0:18
Why is CBC with predictable IV considered insecure against chosen-plaintext attack?
Awarded May 21 at 17:21
What is straight line black box reduction?
Awarded May 7 at 18:26
Do I need to use a CSPRNG when creating salts for user accounts?
Awarded May 7 at 7:35
Encrypting arbitrary large files in AEAD chunks - how to protect against chunk reordering?
Awarded May 1 at 20:02
Polynomial-time Quantum Algorithms for Lattice Problems
Awarded Apr 19 at 15:11
How are primes generated for RSA?
Awarded Apr 17 at 19:40
Is Curve25519 vulnerable to private key exposure in the case of a bad RNG?
Awarded Apr 16 at 10:32
What is the MD5 collision with the smallest input values?
Awarded Apr 16 at 8:30
What is the advantage of XTS over CBC mode (with diffuser)?
Awarded Mar 31 at 22:10
How is encryption broken today?
Awarded Mar 25 at 14:33
Why should I use Authenticated Encryption instead of just encryption?
Awarded Mar 25 at 13:34
Is there a format preserving cryptographically secure hash?
Awarded Mar 18 at 21:48
Relationship between a key stream having a high entropy and whether it is cryptically secure in a stream cipher
Awarded Mar 17 at 5:36
Details about blind signature on ed25519
Awarded Mar 2 at 11:04
RSA and prime difference
Awarded Mar 1 at 9:18
HMAC vs Encrypted Hash
Awarded Feb 29 at 14:42
Would the ability to efficiently find Discrete Logs have any impact on the security of RSA?
Awarded Feb 16 at 21:11
Questions about the argon2 options
Awarded Feb 7 at 17:05
Proof of non-membership on a Merkle tree?
Awarded Jan 20 at 9:40
Why does anyone use elliptic curves for a CSPRNG?
Awarded Jan 18 at 22:51
Should we MAC-then-encrypt or encrypt-then-MAC?
Awarded Jan 15 at 19:02
Why Smart's attack doesn't work on this ECDLP?
Awarded Jan 7 at 2:37
How to attack a "many-time pad" based on what happens when an ASCII space is XORed with a letter?
Awarded Jan 3 at 7:25
NIST PQC: minimum number of digital signatures
Awarded Dec 10, 2023 at 11:11
Is it safe to derive a secret from a signature?
Awarded Dec 5, 2023 at 12:20
Use case for extendable-output functions (XOF) such as SHAKE128/SHAKE256
Awarded Nov 28, 2023 at 11:37
Truncating ciphertext as encryption and to decrease bandwidth in code-based PKEs
Awarded Nov 24, 2023 at 6:11
Graphically representing points on Elliptic Curve over finite field
Awarded Nov 14, 2023 at 4:34
Purpose of DES parity bits
Awarded Oct 25, 2023 at 7:50
Should we sign-then-encrypt, or encrypt-then-sign?
Awarded Sep 22, 2023 at 9:16
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