Cryptography

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Awarded 567 times.
Does "Shattered" actually show SHA-1-signed certificates are "unsafe"?
Awarded May 11, 2019 at 1:00
What is so special about elliptic curves?
Awarded May 10, 2019 at 10:25
Why is padding used for RSA encryption given that it is not a block cipher?
Awarded May 2, 2019 at 17:30
Is there really no use for MD5 anymore?
Awarded Apr 27, 2019 at 13:20
Why does BitLocker not use RSA?
Awarded Apr 23, 2019 at 22:55
Taking advantage of one-time pad key reuse?
Awarded Apr 17, 2019 at 17:31
Why was the term "discrete" used in discrete logarithm?
Awarded Apr 17, 2019 at 16:30
What is the relation between Discrete Log, Computational Diffie-Hellman and Decisional Diffie-Hellman?
Awarded Apr 12, 2019 at 21:35
Why must IV/key-pairs not be reused in CTR mode?
Awarded Apr 10, 2019 at 4:55
Why does AES have exactly 10 rounds for a 128-bit key, 12 for 192 bits and 14 for a 256-bit key size?
Awarded Mar 22, 2019 at 14:05
How is the Swiss post e-voting system supposed to work, and how was it wrong?
Awarded Mar 14, 2019 at 13:15
Turning a cipher into a hashing function
Awarded Mar 12, 2019 at 12:30
Why is AES not a Feistel cipher?
Awarded Mar 11, 2019 at 1:00
Are there two known strings which have the same MD5 hash value?
Awarded Mar 7, 2019 at 16:45
Low Public Exponent Attack for RSA
Awarded Mar 6, 2019 at 16:25
How does ECDH arrive on a shared secret?
Awarded Feb 23, 2019 at 11:20
Is one-time pad encryption vulnerable when near identical data is sent many times with different OTP?
Awarded Feb 19, 2019 at 18:25
How to choose between AES-CCM and AES-GCM for storage volume encryption
Awarded Feb 13, 2019 at 14:20
Is one-time pad encryption vulnerable when near identical data is sent many times with different OTP?
Awarded Feb 10, 2019 at 1:15
HMAC vs ECDSA for JWT
Awarded Feb 4, 2019 at 22:00
Are there two known strings which have the same MD5 hash value?
Awarded Jan 17, 2019 at 9:40
Can someone explain the ECB Penguin?
Awarded Jan 10, 2019 at 7:00
If Kerckhoff's Principle holds, why do we need a cipher at all?
Awarded Dec 31, 2018 at 17:15
Looking at hash output – is Base64 encoding in any way better than HEX encoding?
Awarded Dec 28, 2018 at 3:45
Reason why “XOR” is a linear operation, but ordinary “addition” isn’t?
Awarded Dec 28, 2018 at 3:45
Information leakage from the ecryptfs filesystem
Awarded Dec 28, 2018 at 3:45
How can Cipher Block Chaining (CBC) in SSL be attacked?
Awarded Dec 28, 2018 at 3:45
Why exactly is Blowfish faster than AES?
Awarded Dec 28, 2018 at 3:45
Why programming languages don't provide simple encryption methods?
Awarded Dec 28, 2018 at 3:45
How does recovering the public key from an ECDSA signature work?
Awarded Dec 28, 2018 at 3:45
What tests can I do to ensure my random number generator is working correctly?
Awarded Dec 28, 2018 at 3:45
RSA with small exponents?
Awarded Dec 28, 2018 at 3:45
Why did Histiaeus tattoo his slave's head?
Awarded Dec 28, 2018 at 3:45
How is the MD2 hash function S-table constructed from Pi?
Awarded Dec 25, 2018 at 9:25
Is HMAC-MD5 considered secure for authenticating encrypted data?
Awarded Dec 22, 2018 at 3:00
Cryptography's random number problem?
Awarded Dec 13, 2018 at 14:35
How many RSA keys before a collision?
Awarded Dec 12, 2018 at 18:20
What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do?
Awarded Dec 9, 2018 at 18:35
How does one attack a two-time pad (i.e. one time pad with key reuse)?
Awarded Dec 8, 2018 at 20:20
Other than password hashes, are there other uses for non-reversible crypto
Awarded Dec 6, 2018 at 0:55
How does the MOV attack work?
Awarded Dec 1, 2018 at 22:30
How practical are side-channel attacks and how much of a concern are they?
Awarded Dec 1, 2018 at 17:25
How do hashes really ensure uniqueness?
Awarded Nov 30, 2018 at 11:55
Ciphertext and tag size and IV transmission with AES in GCM mode
Awarded Nov 21, 2018 at 13:35
Can a large file be hashed down to 32 bytes, and then reconstructed from the hash?
Awarded Nov 21, 2018 at 6:00
Why hash the message before signing it with RSA?
Awarded Nov 18, 2018 at 15:05
Zero knowledge proof protocol example?
Awarded Nov 17, 2018 at 1:25
What is difference between PRG, PRF, and PRP
Awarded Nov 15, 2018 at 16:35
If WhatsApp cannot read our message, how can the media forwarding happen in an instant?
Awarded Nov 4, 2018 at 20:50
What is the difference between TRNG and CSPRNG?
Awarded Nov 1, 2018 at 20:50
Can someone explain the ECB Penguin?
Awarded Oct 30, 2018 at 12:50
What was NIST’s reason to switch naming from MD… (Message Digest) to SHA… (Secure Hashing Algorithm)?
Awarded Oct 28, 2018 at 3:25
Why doesn't steganography increase the size of an uncompressed image?
Awarded Oct 26, 2018 at 22:30
What's the appeal of using ChaCha20 instead of AES?
Awarded Oct 25, 2018 at 17:05
How do hashes really ensure uniqueness?
Awarded Oct 23, 2018 at 12:00
What is the advantage of XTS over CBC mode (with diffuser)?
Awarded Oct 10, 2018 at 14:25
How is XOR used for encryption?
Awarded Oct 8, 2018 at 21:40
What is the difference between a HMAC and a hash of data?
Awarded Oct 3, 2018 at 16:15
Why is SHA-3 robust against Length-Extension Attacks?
Awarded Sep 26, 2018 at 9:00
Differences between industrial and military cryptography
Awarded Sep 24, 2018 at 20:35
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