304 reputation
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location Netherlands
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visits member for 2 years, 8 months
seen 2 days ago

Mar
21
accepted Is it safe to prefix the a key with a known value?
Mar
21
accepted Which algorithm can be performed by humans?
Mar
21
comment Which algorithm can be performed by humans?
I dont think its mono-alphabetic, because with my brother I would take the key on the left. And with my mother the upper key. Or would it still be mono-alphabetic in this case?
Mar
21
asked Which algorithm can be performed by humans?
Mar
21
accepted Are factorization algorithms parallelizable?
Mar
20
asked Is it safe to prefix the a key with a known value?
Mar
20
comment Are factorization algorithms parallelizable?
Im asking if the process of factoring an integer can be done in parallel? For example, in audio or video decoding its very easy to split the job across threads/processes or even machines. Bruteforcing a hash can also be split across multiple machines. But some tasks are hard to split the work, and I want to know which category this falls in.
Mar
20
accepted What is the most light-weight symmetric cipher thats still usefull?
Mar
20
asked Are factorization algorithms parallelizable?
Mar
19
comment What happens when a RC4 stream gets corrupted?
I just consider it, I dont have to do nothing
Mar
19
comment What happens when a RC4 stream gets corrupted?
The problem is that the secret is easily predictable (you add known bytes to the key). And the reset is kind of expensive, i wish I could keep the state and still be able to do random reads
Mar
19
comment What happens when a RC4 stream gets corrupted?
I write the 200 MB file in 2 KB blocks. Does it make sense to reset the keystate for every block? Or is it better to initialize it only once for the whole file?
Mar
19
comment What is the most light-weight symmetric cipher thats still usefull?
@cpast I mean power+memory requirements. Decryption can be very slow, but encryption (which is done on the device) must almost be costless like Virgene cipher.
Mar
19
comment What is the most light-weight symmetric cipher thats still usefull?
@LightBit Yes, but I underclocked to 12 Mhz instead of 48, and Im not running from RAM but from FLASH, so I will never reach those numbers.
Mar
18
comment Reusing a one-time pad?
@MaartenBodewes The max clock for a Cortex M0 is 48Mhz, and I underclocked 4 times. The device is a batterypowered sleeprecorder so it doesnt need to be fast as long as it can do its job.
Mar
18
accepted What happens when a RC4 stream gets corrupted?
Mar
17
revised Reusing a one-time pad?
added 73 characters in body
Mar
17
revised What is the most light-weight symmetric cipher thats still usefull?
added 130 characters in body
Mar
17
comment Reusing a one-time pad?
@CodesInChaos I picked RC4 because it looks so simple. So can you add your comment as an answer so I can accept it.
Mar
17
comment Reusing a one-time pad?
Is TripleDES faster or slower than RC4?, because I picked RC4 now.