Reputation
68,100
Next tag badge:
679/400 score
78/80 answers
Badges
19 169 264
Newest
 aes
Impact
~3.1m people reached

May
1
answered Why won't Firefox accept my certificate?
May
1
awarded  Nice Answer
Apr
30
awarded  Nice Answer
Apr
29
revised How does reuse attack protection (RAP) work?
added 845 characters in body
Apr
29
revised How does reuse attack protection (RAP) work?
added 315 characters in body
Apr
29
answered How does reuse attack protection (RAP) work?
Apr
29
comment USB TEMPEST attacks: viable range?
I'm unaware of any papers, and any properly informed replies would likely have to involve a serious amount of research into the practicality of it. It's also going to be hugely variant on the individual implementation - something as trivial as the location and shape of ground and power planes might vastly alter the amount of EMI that's emitted.
Apr
29
comment Ransomware doesn't change file extension after encryption
@JeanCarlosSuárezMarranzini Not off the top of my head. There are so many out there, both prevalent and less-so, that it's almost impossible to guess in most cases from behaviour like this. As you noted, the ransom note is a much better indicator.
Apr
29
comment Ransomware doesn't change file extension after encryption
@JeffMeden Or it could just add a known identifier to the start (or end) of the file contents to show it was encrypted. Or just assume that, after its first run, all file types with specific extensions were already encrypted. The possibilities are numerous.
Apr
29
comment What are the disadvantages of using public key cryptography when encrypting files?
You're also forgetting that asymmetric crypto is incredibly slow on large data sets. Algorithms such as RSA have a requirement that the data being "encrypted" is smaller than the key. Trying to encrypt even a few tens of kilobytes would take a huge amount of computing time. By comparison, symmetric algorithms are incredibly fast.
Apr
29
answered Ransomware doesn't change file extension after encryption
Apr
29
comment To what extent does formatting a disk (securely) remove its data?
@Mindwin Then take the same approach with TLS, password hashing, and everything else. Your position is ridiculous from a practical perspective. Might AES be broken in future? Sure. Might a meteor wipe the planet out? Sure. But within the foreseeable future it's fine, nobody needs to panic, and planning / compensating for it is a complete waste of your time on this planet. Feasibly speaking a discarded key renders AES-encrypted data unreadable. Your data is, in all practical senses, gone.
Apr
28
comment To what extent does formatting a disk (securely) remove its data?
@Mindwin No, 256-bit keys are physically impossible to brute-force due to the energy required; a classical computer would require more energy than the universe contains, and even with Grover's algorithm a quantum computer would require 2^128 operations and a large gate cost, which still requires almost as much energy as we can observe in the known universe. It is physically impossible from a brute-force perspective. Judging by cryptographic attacks from the past hundred years, feasible ciphertext-only exploits are far and few even with seriously weaker designs than AES.
Apr
28
comment To what extent does formatting a disk (securely) remove its data?
@Mindwin Since 256-bit keys are physically impossible to bruteforce, I wouldn't worry about it.
Apr
28
comment To what extent does formatting a disk (securely) remove its data?
@Nayuki I've never heard that either. My understanding is it overwrites each sector.
Apr
27
awarded  Good Answer
Apr
27
awarded  Nice Answer
Apr
27
answered How to protect from WPAD attacks?
Apr
27
revised To what extent does formatting a disk (securely) remove its data?
added 26 characters in body
Apr
27
answered To what extent does formatting a disk (securely) remove its data?