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May
15
revised Does the plaintext have to be at least as long as the key in Polyalphabetic substituion cipher
It would be shift cipher not a monoalphabetic substitution cipher
May
15
revised Does the plaintext have to be at least as long as the key in Polyalphabetic substituion cipher
added 685 characters in body
May
15
answered Does the plaintext have to be at least as long as the key in Polyalphabetic substituion cipher
May
13
comment Time Capsule cryptography?
@kasperd: Sure, but it's a one-time setup cost. You launch the reflector / retransmitter well in advance, so that you can use it later when it's far enough. I never said this was a practical solution right now (if ever). Although, if you only need a delay of a few seconds, there's a convenient reflector already on the Moon. And we do technically have an active retransmitter at about 17 light hours away, even if contacting it discreetly may be tricky. ;-)
May
12
comment Time Capsule cryptography?
@kasperd: An active retransmitter would cut that down to the square of the distance. And, of course, the scaling law only starts to apply at distances where the beam width exceeds the size of the receiver / reflector, so the bigger you can make the reflector, and the better you can collimate the beam, the further you can reach with the same energy.
May
10
revised What is the main difference between a key, an IV and a nonce?
fix title grammar, misc. copyedits, add terminology tag
May
10
comment how does an initialization vector work?
Related question: crypto.stackexchange.com/questions/3965/…
May
9
reviewed Approve How to break AES/CBC/PKCS5 when key and IV are reused?
May
9
revised Optimal bandwidth cost for Oblivious RAM
better title
May
9
answered How do institutions like banks do RSA with big primes?
May
9
revised Definition of the term “key”
added 76 characters in body
May
9
revised Definition of the term “key”
added 76 characters in body
May
9
revised Definition of the term “key”
added 76 characters in body
May
9
answered Definition of the term “key”
May
9
reviewed Edit How to create a PEM file for storing an RSA key?
May
9
revised How to create a PEM file for storing an RSA key?
added 8 characters in body; edited tags; edited title
May
9
comment How to create a PEM file for storing an RSA key?
@poncho: Technically, this question is about implementing a standard storage format for cryptographic keys. The mention of OpenSSL is really a red herring. I think it's on topic here, if perhaps marginally. (And there's certainly some overlap with Stack Overflow here; not that there's necessarily anything wrong with that.)
May
9
reviewed Close If someone had a list of all primes, would it be possible for them to factor any integer in polynomial time?
May
9
reviewed Close Understanding Diffie-Hellman Key Exchange
May
9
comment Definition of the term “key”
Note that a key (in the sense of "thing used to open a lock") is also a key (in the sense of "essential to make something work"). Without a matching key, a lock is little more than a useless lump of metal.