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fgrieu
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  • Member for 12 years, 8 months
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156 votes
Accepted

How big an RSA key is considered secure today?

129 votes
Accepted

If WhatsApp cannot read our message, how can the media forwarding happen in an instant?

75 votes
Accepted

Impacts of not using RSA exponent of 65537

67 votes

How can I make sure non-open source programs are really using end-to-end encryption?

61 votes
Accepted

Is the software that uses PGP broken, or is it PGP itself?

59 votes
Accepted

Why we can't implement AES 512 key size?

55 votes
Accepted

Cracking RSA (or other algorithms) manually by a savant

54 votes
Accepted

"SHA-256" vs "any 256 bits of SHA-512", which is more secure?

53 votes
Accepted

Largest integer factored by Shor's algorithm?

53 votes
Accepted

Is it bad to expose the public key?

50 votes
Accepted

Can you use memory errors as a source of randomness for cryptography?

47 votes
Accepted

How was the special DES key 0E329232EA6D0D73 found?

43 votes
Accepted

Does RSA work for any message M?

43 votes
Accepted

Is 80 bits of key size considered safe against brute force attacks?

42 votes

What size should the HMAC key be with SHA-256?

41 votes
Accepted

Is there a string that's hash is equal to itself?

40 votes
Accepted

Why is PuTTYgen-created RSA public exponent(e) not in {3,17,65537}?

40 votes
Accepted

What makes Quantum Cryptography secure?

39 votes
Accepted

Why is HMAC-SHA1 still considered secure?

39 votes

Why can't I reverse a hash to a possible input?

39 votes
Accepted

What is a Pedersen commitment?

37 votes
Accepted

Why is the Keyspace of a Substitution Cipher not 2^26 but 2^88

37 votes
Accepted

Is it safe to create a public ID by hashing a private key?

37 votes
Accepted

Why is plain-hash-then-encrypt not a secure MAC?

37 votes
Accepted

What are the odds of collisions for a hash function with 256-bit output?

36 votes
Accepted

How are the functions used in cryptographic hash functions chosen?

36 votes
Accepted

Why should I use an Initialization Vector (IV) when I have unique keys?

35 votes
Accepted

How can C rand() be exploited if a secure seed is used?

34 votes

How come Public key cryptography wasn't discovered earlier?

34 votes

Why is FIPS 140-2 compliance controversial?

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