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  • 0 posts edited
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  • 54 votes cast
Jul
1
accepted Adding tweak to a block cipher
Jun
26
accepted Is algorithm with more than $2^{word size}$ words secure?
Jun
25
comment Is algorithm with more than $2^{word size}$ words secure?
As you pointed out algorithm is broken, however you did not answer my question. Question is generic, not specific to this algorithm, which is only example. So let's say it has $2^{32}$ rounds.
Jun
25
revised Is algorithm with more than $2^{word size}$ words secure?
added 4 characters in body
Jun
25
revised Is algorithm with more than $2^{word size}$ words secure?
pseudo-random permutation
Jun
25
comment Is algorithm with more than $2^{word size}$ words secure?
Sorry my mistake, I forgot to mention it is not a block cipher, it is pseudo-random permutation.
Jun
25
asked Is algorithm with more than $2^{word size}$ words secure?
Jun
25
awarded  Citizen Patrol
Jun
24
awarded  Constituent
Jun
24
awarded  Caucus
Jun
10
comment Rationale for use of right-shift (rather than rotate) in SHA-2?
Here is explanation for Serpent's linear layer: "Notice that if the linear transformation had used only rotates, then every characteristic could have 32 equiprobable rotated variants, with all the data words rotated by the same number of bits. This is the reason that we also use shift instructions, which avoid most of these rotated characteristics." cryptosoft.net/docs/Serpent.pdf
May
31
revised Why using AES in ECB (Electronic Code Book) mode a bad idea?
deleted 7 characters in body
May
31
answered Why using AES in ECB (Electronic Code Book) mode a bad idea?
May
30
awarded  Autobiographer
Apr
12
comment CTR_DRBG versus OFB_DRBG
It is because OFB has short cycles and can't be computed in parallel.
Mar
27
comment Is the SEED blockcipher still secure?
@VincentAdvocaat You can encrypt same block multiple times (10000x). If you need fast stream cipher I would suggest ChaCha.
Mar
24
comment Is the SEED blockcipher still secure?
I'm also wondering, why your SEED is much faster when decrypting?
Mar
24
comment Is the SEED blockcipher still secure?
In my experiences SEED is noticeably slower than AES on x86_64.
Mar
20
comment What is the most light-weight symmetric cipher thats still usefull?
@Muis I think ChaCha is the best choice for this CPU. DES, LED, PRESENT, and Piccolo are fast in hardware, but slow in software. RC4 is good for 8-bit CPUs.
Mar
18
comment What is the most light-weight symmetric cipher thats still usefull?
So your platform is ARM Cortex-M0 LPC11A14 at 48 MHz or similar?