secured frequencies

[mmckenna]

Eh? That isn't true for AES or DES.

I'm keeping it simple for the OP with 12 total posts. And, yes, my data is probably based off slow computers 10 years ago. I'm sure it can be done much faster now, but that's not what we're discussing. He's talking about the possibility of having a "police scanner" that will decrypt traffic.

 

[slicerwizard]

So you think AES256 can be cracked much faster now? You really don't get it...

 

[KK4JUG]

If it could be cracked, we'd all be listening to it.

 

[mmckenna]

So you think AES256 can be cracked much faster now? You really don't get it...

I don't know, never tried to crack it, never had the need or desire to. Only passing on what I've learned from others.

How about you enlighten me, please?

 

[jonwienke]

The whole point of AES is to take billions of years, even with advanced supercomputers.

The old encryption standard DES can be cracked in hours with specialized hardware.

 

[mmckenna]

The whole point of AES is to take billions of years, even with advanced supercomputers.

The old encryption standard DES can be cracked in hours with specialized hardware.

Thanks Jon, that was a helpful answer.

I've heard varying stories from many sources about what's breakable, what's not and how long it would take. I knew DES was relatively weak and AES was stronger but I guess I underestimated how much.

As I said above, I've never made an attempt to try to figure out how to break encryption, so all my information is from what I read. I'm using the basic NXDN encryption at work, and while we've discussed using something stronger, we've never gone in that direction.

Thanks for the answer.

 

[INDY72]

Correct, AES256, using 256 Bit Encryption is a MUCH better solution for enhanced security on radio communications. The older standard DES is ONLY 56 Bit, and though was State of the Art for a while, has been proven to be very flawed for modern use. ADP, though secure enough for basic use, is not the preferred standard, and is mainly in use for one reason only... ITS FREE on most systems now! Here is the rundown from the guys that know on what is recommended and what is required on higher tier systems if you even want to deal with any Feds.

https://www.dhs.gov/sites/default/f...n Land Mobile Radio Systems_Final508c_0_0.pdf

 

[jonwienke]

Applied Cryptography by Bruce Schneier is a good reference also.

 

[slicerwizard]

As I said above, I've never made an attempt to try to figure out how to break encryption, so all my information is from what I read.

a) key size in bits
b) keyspace size
c) relative time to brute force

Absent some weakness in an encryption algorithm or its implementation or in key management, it's just simple math: a) yields b) yields c)

 

[krokus]

a) key size in bits
b) keyspace size
c) relative time to brute force

Absent some weakness in an encryption algorithm or its implementation or in key management, it's just simple math: a) yields b) yields c)

If you want to see some examples of brute force times, check out this page.
http://www.distributed.net/RC5

Sent via Tapatalk

 

[kd4bas]

https://www.dhs.gov/sites/default/f...n Land Mobile Radio Systems_Final508c_0_0.pdf

I downloaded and read this guide, it was recently published and gives the reasoning behind the nonuse of DES in favor of AES and has some very good info. Not a bad reference, thanks.