Davide's blog

The weakest link

Unfortunately, people sometimes do not seriously think about which is really the weakest link in a security system. And there is also a more subtle issue: strengthening a link may cause the attacker to change his strategy, with undesirable consequences. I remember a story about some car anti-theft devices being "too" secure in making hot-wiring difficult, so that they actually caused an increase in carjackings. It is probably better (as well as much safer) to discover that one's car has been stolen when returning to the car park...

xkcd - security

(comic from xkcd)

Imagination, scepticism, and sense of humour

People lacking imagination, scepticism, and a sense of humour should not work in the security field.

– Anonymous

Snow

When we woke up this morning in Lodi there were about fifteen centimetres of snow on the ground, fallen during the night. I took the opportunity to go for a walk in the countryside, and to take some pictures.

Lodi - snow on the countryside

Lodi - snow on the countryside

Lodi - snow on the countryside

Ah, licences...

xkcd - Faust 2.0

(from xkcd)

These things happen...

...when one is drunk (from xkcd).

xkcd - responsible behaviour

The Love Song of J. Alfred Prufrock


S'io credesse che mia risposta fosse
a persona che mai tornasse al mondo,
questa fiamma staria senza piu scosse.
Ma perciocché giammai di questo fondo
non tornò vivo alcun, s'i' odo il vero,
senza tema d'infamia ti rispondo.

Let us go then, you and I,
When the evening is spread out against the sky
Like a patient etherized upon a table;
Let us go, through certain half-deserted streets,
The muttering retreats
Of restless nights in one-night cheap hotels
And sawdust restaurants with oyster-shells:
Streets that follow like a tedious argument
Of insidious intent
To lead you to an overwhelming question...
Oh, do not ask, "What is it?"
Let us go and make our visit.

In the room the women come and go
Talking of Michelangelo.

The yellow fog that rubs its back upon the window-panes,
The yellow smoke that rubs its muzzle on the window-panes,
Licked its tongue into the corners of the evening,
Lingered upon the pools that stand in drains,
Let fall upon its back the soot that falls from chimneys,
Slipped by the terrace, made a sudden leap,
And seeing that it was a soft October night,
Curled once about the house, and fell asleep.

And indeed there will be time
For the yellow smoke that slides along the street,
Rubbing its back upon the window-panes;
There will be time, there will be time
To prepare a face to meet the faces that you meet;
There will be time to murder and create,
And time for all the works and days of hands
That lift and drop a question on your plate;
Time for you and time for me,
And time yet for a hundred indecisions,
And for a hundred visions and revisions,
Before the taking of a toast and tea.

In the room the women come and go
Talking of Michelangelo.

And indeed there will be time
To wonder, "Do I dare?" and, "Do I dare?"
Time to turn back and descend the stair,
With a bald spot in the middle of my hair —
(They will say: "How his hair is growing thin!")
My morning coat, my collar mounting firmly to the chin,
My necktie rich and modest, but asserted by a simple pin —
(They will say: "But how his arms and legs are thin!")
Do I dare
Disturb the universe?
In a minute there is time
For decisions and revisions which a minute will reverse.

For I have known them all already, known them all:
Have known the evenings, mornings, afternoons,
I have measured out my life with coffee spoons;
I know the voices dying with a dying fall
Beneath the music from a farther room.
So how should I presume?

And I have known the eyes already, known them all —
The eyes that fix you in a formulated phrase,
And when I am formulated, sprawling on a pin,
When I am pinned and wriggling on the wall,
Then how should I begin
To spit out all the butt-ends of my days and ways?
And how should I presume?

And I have known the arms already, known them all —
Arms that are braceleted and white and bare
(But in the lamplight, downed with light brown hair!)
Is it perfume from a dress
That makes me so digress?
Arms that lie along a table, or wrap about a shawl.
And should I then presume?
And how should I begin?

. . . . .

Shall I say, I have gone at dusk through narrow streets
And watched the smoke that rises from the pipes
Of lonely men in shirt-sleeves, leaning out of windows? ...

I should have been a pair of ragged claws
Scuttling across the floors of silent seas.

. . . . .

And the afternoon, the evening, sleeps so peacefully!
Smoothed by long fingers,
Asleep... tired... or it malingers,
Stretched on the floor, here beside you and me.
Should I, after tea and cakes and ices,
Have the strength to force the moment to its crisis?
But though I have wept and fasted, wept and prayed,
Though I have seen my head (grown slightly bald) brought in upon a platter,
I am no prophet — and here's no great matter;
I have seen the moment of my greatness flicker,
And I have seen the eternal Footman hold my coat, and snicker,
And in short, I was afraid.

And would it have been worth it, after all,
After the cups, the marmalade, the tea,
Among the porcelain, among some talk of you and me,
Would it have been worth while,
To have bitten off the matter with a smile,
To have squeezed the universe into a ball
To roll it toward some overwhelming question,
To say: "I am Lazarus, come from the dead,
Come back to tell you all, I shall tell you all" —
If one, settling a pillow by her head,
Should say: "That is not what I meant at all.
That is not it, at all."

And would it have been worth it, after all,
Would it have been worth while,
After the sunsets and the dooryards and the sprinkled streets,
After the novels, after the teacups, after the skirts that trail along the floor —
And this, and so much more? —
It is impossible to say just what I mean!
But as if a magic lantern threw the nerves in patterns on a screen:
Would it have been worth while
If one, settling a pillow, or throwing off a shawl,
And turning toward the window, should say:
"That is not it at all,
That is not what I meant, at all."

. . . . .

No! I am not Prince Hamlet, nor was meant to be;
Am an attendant lord, one that will do
To swell a progress, start a scene or two,
Advise the prince; no doubt, an easy tool,
Deferential, glad to be of use,
Politic, cautious, and meticulous;
Full of high sentence, but a bit obtuse;
At times, indeed, almost ridiculous —
Almost, at times, the Fool.

I grow old... I grow old...
I shall wear the bottoms of my trousers rolled.

Shall I part my hair behind? Do I dare to eat a peach?
I shall wear white flannel trousers, and walk upon the beach.
I have heard the mermaids singing, each to each.

I do not think that they will sing to me.

I have seen them riding seaward on the waves
Combing the white hair of the waves blown back
When the wind blows the water white and black.

We have lingered in the chambers of the sea
By sea-girls wreathed with seaweed red and brown
Till human voices wake us, and we drown.

— T. S. Eliot

Random numbers

I am afraid that, sometimes, this is not so far from being true...

Random number generation

(from xkcd).

IP address space map

Nice... (from xkcd).

IP address space map

Who is a hacker?

The word hacker is usually related to computers and computer networks, and it even appears in the Internet Users' Glossary (RFC 1983) with the following definition:

hacker: A person who delights in having an intimate understanding of the internal workings of a system, computers and computer networks in particular. The term is often misused in a pejorative context, where "cracker" would be the correct term.

Computers and computer networks are explicitly mentioned, but "in particular" and not as the only possibility. Bruce Schneier goes beyond this, giving a more general definition, with no reference to that specific field:

A hacker is someone who thinks outside the box. It's someone who discards conventional wisdom, and does something else instead. It's someone who looks at the edge and wonders what's beyond. It's someone who sees a set of rules and wonders what happens if you don't follow them. A hacker is someone who experiments with the limitations of systems for intellectual curiosity.

This is maybe a bit provocative (as Schneier says in his article, which I recommend, Galileo was a hacker!), but I think it gets the point: it is not just a matter of technical skills, it is most of all a mindset. I recommend another reading: The Hacker Ethic and the Spirit of the Information Age by Pekka Himanen.

Safety and liberty

Those who would give up essential liberty to purchase a little temporary safety, deserve neither liberty nor safety.

— Benjamin Franklin

On 9/11 anniversary, I think this is worth remembering.

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