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Security and Crypto Technologist


Mar
4
comment Any practical uses of machine learning for cryptography?
ah ! learning with errors is good example , did not strike me thanks for that
Mar
4
comment Any practical uses of machine learning for cryptography?
would be interested if some body is doing this or want to do this . please reach out to me .
Feb
25
revised PRP, PRF and modular arithmetic
more clarity
Feb
25
comment PRP, PRF and modular arithmetic
I believe , what could be found out from google , can be left for seekers exercise and save some time of one who answers it.
Feb
24
answered PRP, PRF and modular arithmetic
Feb
21
comment Which gives better deterministic encryption SIV or Plain ECB mode?
@pg1989 yes got it . so i dont have length preservation as criteria . the output could be longer .
Feb
19
comment Which gives better deterministic encryption SIV or Plain ECB mode?
Imagine some data type that is 128 bits like say IPv6 address and for some reason i want to encrypt it deterministically.
Feb
19
revised Which gives better deterministic encryption SIV or Plain ECB mode?
more clarity
Feb
19
comment Which gives better deterministic encryption SIV or Plain ECB mode?
ok i meant message and block as same . let me edit the question
Feb
19
comment Which gives better deterministic encryption SIV or Plain ECB mode?
same holds good for ECB mode too .
Feb
19
accepted Security of Deterministic Encryption Scheme
Feb
19
asked Which gives better deterministic encryption SIV or Plain ECB mode?
Feb
13
comment Pseudo random permutation for arbitrary size domains
my last suggestion of , Feistel Networks + Cycle walking should help . please "PRP Luby Rack off revisited" by Naor and Reingold .
Feb
12
comment Pseudo random permutation for arbitrary size domains
@PaŭloEbermann using FPE with AES-NI is comparable speeds with AES-NI. Feistel networks with 10 or so rounds with AES-NI hardly slows it down .
Feb
12
answered Pseudo random permutation for arbitrary size domains
Feb
12
comment Should tweak be unique per message?
well that is not the point , the TBC can be used in any mode, it is just a block cipher with additional input tweak , for all practical purposes its block cipher and can be used in any mode .
Feb
11
answered Should tweak be unique per message?
Feb
11
comment Should tweak be unique per message?
Tweaks are designed to provide randomness to block ciphers directly rather than using the block cipher in some mode. I cannot agree for few things in the answer. 1. "Tweaks are never used directly", check out the different modes of FPE, tweaks are given directly by the user. 2."None of these needs to be visible to a programmer...", same check FPE. Now with this its appropriate to ask the comparison if its more secure to use a block cipher + IV per message or use a block cipher + same tweak for all messages !
Feb
11
comment Should tweak be unique per message?
if the developer does not need to know about tweak , how is the tweak generated/provisioned/provided as input to encryption algorithm , how is the same tweak provided again to decryption algorithm run in a different machine ?
Feb
11
revised Should tweak be unique per message?
more clarity