Cryptography

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Awarded 5638 times.
Use a SHA256 as a key for AES256
Awarded 2 days ago
Do Partially Homomorphic Encryption schemes also suffer from noise overflow?
Awarded 2 days ago
General factoring and one-way functions
Awarded Aug 19 at 16:45
Cipher recommendation for known-plaintext attack
Awarded Aug 19 at 12:00
Decrypting arbitrary numbers with RSA
Awarded Aug 19 at 11:50
Algorithm to find primes $q$ and $p$ with $q\, |\, p - 1$?
Awarded Aug 19 at 7:00
Proving the CCA-insecurity of El Gamal encryption scheme
Awarded Aug 16 at 21:15
What is / How would I calculate the number of bits(?) I need to make the probability of a collision very small?
Awarded Aug 15 at 22:05
specific scenario question relating to using NACL crypto_box in a protocol
Awarded Aug 15 at 22:05
NaCl allows decryption with the same public key as for encryption
Awarded Aug 15 at 21:05
Is it feasible to find n hashes that sum up to a given hash?
Awarded Aug 15 at 20:10
What is a randomly derived key?
Awarded Aug 14 at 12:40
Question about Enigmas involutional property and its reduction of possible ciphers
Awarded Aug 13 at 16:40
Is it feasible to get a hash collision for CRC32, MD-5 and SHA-1 on one file?
Awarded Aug 13 at 13:55
What time is used in a TOTP counter?
Awarded Aug 13 at 8:25
Encrypting a JPG, where the output is a scrambled JPG [duplicate]
Awarded Aug 11 at 18:05
Using public-key signature instead of having API key
Awarded Aug 11 at 2:25
Signal protocol, how is Signed PreKey created?
Awarded Aug 10 at 21:30
How exactly is TFHE secure?
Awarded Aug 10 at 20:50
Validating JWT works with small changes to public key, why?
Awarded Aug 10 at 19:05
Could public-key crypto be performed long ago if the idea had been discovered?
Awarded Aug 9 at 14:55
Strongest collision resistance test?
Awarded Aug 8 at 18:45
MuSig/Schnorr key aggregation: How get the combined private key
Awarded Aug 8 at 15:15
Signing a binary hash vs character representation of the same hash
Awarded Aug 8 at 13:45
Where does signing/decrypting take place on a YubiKey 4/5 PIV private key?
Awarded Aug 8 at 6:30
Understanding need for PKI
Awarded Aug 8 at 6:00
Discrete logarithms on elliptic curves
Awarded Aug 7 at 15:25
When to use Argon2i vs Argon2d vs Argon2id?
Awarded Aug 7 at 14:10
Is it safe to reuse the salt for generating symmetric keys for a chat application?
Awarded Aug 7 at 13:05
Is the Java function AES/CBC/PKCS5Padding vulnerable to padding oracle?
Awarded Aug 7 at 9:05
Security of RSA public key depending on how it's computed [duplicate]
Awarded Aug 7 at 4:25
Why do I want to use PGP subkeys?
Awarded Aug 6 at 14:10
Most secure but feasible encryption running on WWII technology
Awarded Aug 5 at 18:50
Is there any asymmetric encryption algorithm for eliptic curve(secp256k1) without AES? [duplicate]
Awarded Aug 5 at 14:20
AES-CBC streaming configuration IV usage
Awarded Aug 5 at 12:55
Are Fujisaki commitments binding if the factorization of the group is known?
Awarded Aug 1 at 18:30
Talking TLS with EC cryptography and the secp256k1 curve [duplicate]
Awarded Jul 31 at 21:35
Lattice-based cryptography
Awarded Jul 31 at 20:15
When encrypting twice with two separate keys, can a single key decrypt both steps?
Awarded Jul 31 at 13:45
Does every language's SHA256 implementation provide different result for the same value [duplicate]
Awarded Jul 31 at 11:25
Zero-Knowledgeness of Fiat-Shamir heuristic
Awarded Jul 31 at 10:45
Can the person who decrypts a homomorphically encrypted value know what operations were run?
Awarded Jul 31 at 6:30
What's the meaning of probabilities in differential privacy formula?
Awarded Jul 30 at 23:50
From the product of two permutation matrices raised to the same power, is it easy to find the power?
Awarded Jul 30 at 12:50
Authentication and encryption using a simplex communication channel
Awarded Jul 30 at 12:05
Do PGP keys with expiration date set expiration date in Encrypted messages too?
Awarded Jul 30 at 8:10
Is $f(K, f(K, x))$ a pseudorandom function?
Awarded Jul 30 at 7:40
ECDSA: Why is SigningKey shorter than VerifyingKey
Awarded Jul 30 at 7:30
Is it possible to derive the midstate of a sha256 hash?
Awarded Jul 29 at 13:10
Why does side-channel security focus on “shielding” rather than “jamming”?
Awarded Jul 29 at 9:35
How is STS more secure than regular DH
Awarded Jul 28 at 22:10
Bitcoin mining nonce and birthday attack
Awarded Jul 28 at 13:00
What is wrong with encryption-based / hash-based commitment schemes?
Awarded Jul 28 at 11:20
Why is it not possible to tap into the HTTPS traffic specifically going from the server to the client?
Awarded Jul 28 at 5:15
How secure is a 40 bytes hexadecimal string AES256 encrypted with 50 bytes random password
Awarded Jul 26 at 18:30
How does converting character set affect hash entropy?
Awarded Jul 26 at 11:45
Securely computing functions over source code
Awarded Jul 25 at 9:25
Is AES-GCM suitable for per chunk encryption?
Awarded Jul 25 at 8:45
Security of ciphersuite and key
Awarded Jul 24 at 17:20
Collision resistant hash function implies one-way function
Awarded Jul 24 at 11:50
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