1,494 reputation
1720
bio website
location Bangalore, India
age 32
visits member for 2 years, 11 months
seen 19 mins ago

Security and Crypto Technologist


Jan
31
comment Is it ok to send part of digital signature if we have bandwidth constraints?
how would you verify ? if you have only part of signature ?
Jan
30
comment Block cipher with key longer than block size
but the relation is not established correctly. the factor does not depend on cardinality of block size but cardinality on the set of permutations possible which is the crucial part to be specific
Jan
25
comment Impact of distinguishing between random text and cipher text?
stand corrected
Jan
24
comment Impact of distinguishing between random text and cipher text?
initially LR schemes suggested 4 , patarin proved its not enough and we need atleast 6 to get good security bounds
Jan
9
comment implication of tweak on bruteforcing a block cipher
i have added more details in my question .
Jan
9
comment implication of tweak on bruteforcing a block cipher
i have edited my question accordingly. so can you tell if tweak has an implication ?
Dec
14
comment What is the impact of different modes on pseudo randomness of AES?
@RichieFrame you mean if ecb used as PRF for more than one block u mean ? because below answer says so
Dec
12
comment What is the difference between PPE and SPPE?
yeah am aware of those references except Lee,Kim's one . am actually looking for Super PRP from PRF Constructions u mentioned of
Dec
12
comment What is the difference between PPE and SPPE?
@e-sushi can u give me pointer to luby-rackoff construction of SPRP you are talking about ?
Nov
22
comment Authentication of machine before installation (to stop piracy)
@supra , its difficult to see the connection , but let me explain , the moment you copy the software its beyond your hands you cant prevent from any one doing anything withit especially if its running it . the prevention might come from preventing copying the file itself which is impossible. Most of the licensing software fail here even if you tie the installation with MAC address too, there is nothing one could do it can be spoofed easily
Nov
21
comment Authentication of machine before installation (to stop piracy)
@e-sushi does not matter it boils down to the same
Nov
21
comment Authentication of machine before installation (to stop piracy)
"Trying to make digital files uncopyable is like trying to make water not wet" Bruce Schneier !
Nov
16
comment How practical is proxy re-encryption for AES?
i wanted practical ones its ok if they are obvious ;)
Nov
16
comment Is it possible to actually verify a “sponge function” security claim?
good job in providing your learnings and details
Nov
13
comment How should we interpret the cryptanalysis results of SIMON and SPECK?
Oh ok , what about SIMON ? or in general what to look for when interpreting cryptanalysis results
Nov
12
comment How does secret sharing solve the partial exposure problem?
can u be more clear on , what is share revealing ? partial key exposure problem ? AFAIK , there is no random value addition
Nov
9
comment Is there a relation between security of rounds of DES and Luby Rackoff rounds?
@RichieFrame any good references on what other properties are required by block cipher apart from CPA ?
Nov
9
comment Why is it important to generate a pseudorandom permutation from a pseudorandom function?
@D.W. Yeah you put it right way ! my misconception is cleared now , by reading about LR and its derivatives work i some how got to believe this is the only way . But inorder to build small domain ciphers i dont see much work building the AES way, although AES is used as PRF
Nov
8
comment Why is it important to generate a pseudorandom permutation from a pseudorandom function?
Is it necessary that a PRP can be constructed always from a PRF ?
Oct
15
comment Is there way to combine secrets first and later split them?
@rath, i dont have public values in my system