284 reputation
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bio website
location Paris, France
age
visits member for 1 year, 9 months
seen 2 days ago

I'm an engineer with experience in applied cryptography, in particular in Smart Card systems.


Apr
12
comment Enquiry to network flow
@AlexyVincenzo: No with that constraint that $(2,5),(4,5),(6,5),(6,7)$ are saturated. Yes without that constraint (we can reduce everything in proportion $8/14$).
Apr
12
revised Enquiry to network flow
Final polish.
Apr
12
revised Enquiry to network flow
This flow is maximal
Apr
12
revised Enquiry to network flow
Polish
Apr
12
comment Enquiry to network flow
@MJD: We have $(5,7)\le9$, because that's a given. I used $(5,7)←8$ to mean than $(5,7)$ is assigned the value $8$ in the flow, and that matches $8\le9$.
Apr
12
revised Enquiry to network flow
Polish
Apr
12
answered Enquiry to network flow
Apr
7
comment Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle.
+1 for the idea of computing the area as ${d_1d_2\over2}\sin\theta$ and getting the details right!
Apr
5
revised Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle.
Final polish
Apr
5
revised Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle.
deleted 1 characters in body
Apr
5
revised Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle.
Add figure
Apr
5
answered Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle.
Apr
4
revised How many commutative block ciphers are there?
Some progress
Apr
4
revised How many commutative block ciphers are there?
Zero is best included in M, so that is has n elements.
Apr
4
revised How many commutative block ciphers are there?
SRA is not injective; zero is best included in M, so that is has n elements.
Apr
4
awarded  Yearling
Apr
4
asked How many commutative block ciphers are there?
Mar
21
revised Decrease of entropy when iterating a random discrete function
edited body
Mar
21
revised Decrease of entropy when iterating a random discrete function
Add visual example
Mar
20
revised Decrease of entropy when iterating a random discrete function
The Directed Graph for a function is a Functional Graph