Cryptography

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What is the difference between information-theoretic and perfect types of security?
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Is it possible to fake any file's SHA256 checksum with Length extension attack? Is SHA256 completely insecure when file size is not also checked?
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Identifying negligible functions
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TLS Finished message: is it MAC or HMAC
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Triple AES-128 encryption with 2 keys
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What is the security strength of an n-bit HMAC?
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When do clients use TLS in PSK mode?
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Why is 2048-bit RSA always paired with 320-bit ECC?
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How to create PSK key? [closed]
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What is the difference between pseudorandom permutation/pseudorandom function/block cipher?
Awarded Feb 26 at 3:17
Is it secure to hash an AES key?
Awarded Feb 25 at 15:03
Why does NIST want 112-bit security from 128-bit key size for lightweight cryptography?
Awarded Feb 25 at 13:40
length extension attack on an MD5 hash of a text file of about 10K Bytes?
Awarded Feb 25 at 13:12
In which cases AES doesn't need IV?
Awarded Feb 25 at 10:55
Cipher Block Chaining Ciphertext Alteration
Awarded Feb 25 at 7:57
Is it necessary to worry about timing attacks when comparing SHA256 or Argon2 hashes?
Awarded Feb 24 at 10:50
Function with no inverse
Awarded Feb 23 at 15:06
Apply a permutation cipher by hand
Awarded Feb 22 at 8:27
Double Encryption Using same key
Awarded Feb 22 at 7:50
Can one use a reversible hash algorithm as a compression function?
Awarded Feb 22 at 6:36
In the RSA DES challenges, how did the contestants know they had found the right key considering they weren't given any plaintext?
Awarded Feb 22 at 6:06
How to check whether the given curve is Elliptic or not?
Awarded Feb 22 at 5:42
Finding the probability of a message encrypting to a given ciphertext
Awarded Feb 22 at 2:11
Are SSL/TLS used for maintaining data confidentiality?
Awarded Feb 22 at 0:17
Using a LibSodium CryptoBox KeyPair with `crypto_sign`
Awarded Feb 21 at 18:40
RSA: How to get ciphertext in decimal from an encrypted base64? [closed]
Awarded Feb 20 at 19:35
Is there such a thing as a hash function with a fixed size input?
Awarded Feb 20 at 8:43
Why is this function pseudo random (PRF)?
Awarded Feb 19 at 21:07
Low level explanation of how a message is sent via RSA
Awarded Feb 19 at 13:47
Which is slower, AES or GCM hash (GHASH), if CPU has no special instructions?
Awarded Feb 19 at 11:18
How to argue to a paranoid that RSA is safe?
Awarded Feb 19 at 8:20
Proving/verifying keys for zero knowledge proof (zkSNARK) in a simple case (possession of a string whose hash is x)
Awarded Feb 19 at 2:35
How to sign a large file for random-access reading?
Awarded Feb 18 at 17:51
Toy one-way hash function for six digit number
Awarded Feb 18 at 10:36
Showing the concatenation of pseudorandom functions is a pseudorandom function [closed]
Awarded Feb 18 at 6:06
Are ephemeral keys symmetric or asymmetric? [closed]
Awarded Feb 18 at 3:42
How to calculate complexity of ElGamal cryptosystem?
Awarded Feb 17 at 15:27
Show that G is not a PRF
Awarded Feb 17 at 1:45
Are these functions pseudo random? Why or why not?
Awarded Feb 16 at 19:26
Just how insecure are VeraCrypt containers encrypted with short passwords?
Awarded Feb 16 at 17:50
Does larger key size mean larger data size in asymmetric encryption?
Awarded Feb 16 at 16:52
Why the symmetric key layer in PGP?
Awarded Feb 16 at 3:09
symmetric encryption with fixed size
Awarded Feb 15 at 23:25
LFSR Jump Ahead Algorithm
Awarded Feb 15 at 18:52
Why is ECBC-MAC with one key insecure?
Awarded Feb 15 at 18:05
FIPS 140 compliance for encrypted files
Awarded Feb 15 at 16:27
What is a good algorithm to scramble data in a 2-D grid
Awarded Feb 15 at 0:19
64 bit Elliptic Curve key?
Awarded Feb 14 at 23:15
An unbreakable book cipher?
Awarded Feb 14 at 15:10
Using Pedersen commitment for a vector
Awarded Feb 14 at 14:10
What are the security effects of reusing a public RSA key to encrypt large data by blocks? [duplicate]
Awarded Feb 13 at 21:26
ElGamal malleability for a given function f(m)
Awarded Feb 13 at 17:07
Why does the Signal protocol use AES/CBC instead of AES/GCM?
Awarded Feb 13 at 16:40
Most efficient way to crack a monoalphabetic substitution cipher with spacing intact
Awarded Feb 13 at 1:45
Proof that a function constructed from a PRP is, or is not a PRF?
Awarded Feb 12 at 20:25
Is there a message size limit with elliptic-curve-based public-key encryption?
Awarded Feb 12 at 19:57
RotWord in Rijndael's Algorithm
Awarded Feb 12 at 19:02
Cracking diffie-hellman
Awarded Feb 12 at 14:11
Generate 2 independent keys from a master key
Awarded Feb 11 at 19:46
Is the security of an HMAC equally important as the security of the cipher itself?
Awarded Feb 11 at 17:50
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