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Blog João Novais

WHAT IS CRYPTOGRAPHY?

The Cryptography is derived from the Greek words "Kryptos". This is the study of secure communication techniques that allow only the sender and recipient of a message to view it's contents of transforming information into nonhuman readable form or vice versa is called cryptography.

As we know that information plays a vital role in running of any business and organizations etc, sensitive details in the wrong hands can leads to loss of business.

Cryptography is the science of ciphering and deciphering messages.To secure communication organizations use cryptology to cipher information .

Or

Cryptography is a method of protecting information and communication through the use of codes so that only those whom the information is intended can read and process it.

In Computer Science, Cryptography refers to secure information and communication techniques derived from mathematical concepts , a set of rule based calculations called algorithm to transform message in ways the hard to readable for human.

This is one of the secure way of communications for a hacker with the help of virtual private network(VPN) like Tor Browser which is also very helpful to change the IP Address(Location of the sender ) for illegal purpose to perform crime in cyberspace . I will discuss in brief about the VPN .

How to Encrypt and Decrypt the text in Cryptography?

Open this website with the help of internert surfing for encryption-"http://wwwmd5online.org"

Open the link for Decrypt the code text-"http://www.md5online.org/md5-decrypt.html"

Type whatever you want for encryption and it will crypt in the code form, copy that code and forward to the intended person whom you want for secure communication and then he/she will Decrypt in the real form.

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Blog João Novais

Hackerhubb.blogspot.com

I receive many messages on how to become a hacker. "I'm a beginner in hacking, how should I start?" or "I want to be able to hack my friend's Facebook account" are some of the more frequent queries. Hacking is a skill. And you must remember that if you want to learn hacking solely for the fun of hacking into your friend's Facebook account or email, things will not work out for you. You should decide to learn hacking because of your fascination for technology and your desire to be an expert in computer systems. Its time to change the color of your hat 😀

I've had my good share of Hats. Black, white or sometimes a blackish shade of grey. The darker it gets, the more fun you have.

If you have no experience don't worry. We ALL had to start somewhere, and we ALL needed help to get where we are today. No one is an island and no one is born with all the necessary skills. Period.OK, so you have zero experience and limited skills…my advice in this instance is that you teach yourself some absolute fundamentals.

Let's get this party started.

What is hacking?

Hacking is identifying weakness and vulnerabilities of some system and gaining access with it.

Hacker gets unauthorized access by targeting system while ethical hacker have an official permission in a lawful and legitimate manner to assess the security posture of a target system(s)

There's some types of hackers, a bit of "terminology".
White hat — ethical hacker.
Black hat — classical hacker, get unauthorized access.
Grey hat — person who gets unauthorized access but reveals the weaknesses to the company.
Script kiddie — person with no technical skills just used pre-made tools.
Hacktivist — person who hacks for some idea and leaves some messages. For example strike against copyright.

Skills required to become ethical hacker.

Curosity anf exploration
Operating System
Fundamentals of Networking

*Note this sites

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Blog João Novais

Hello, In first place I'm not going to do an algorithmic benchmark, just a simple loop + print test and some checks on the generated binaries.

The system is a Debian12 Linux and the architecture is: x86 64bits.

Rust

Mojo

Mojo don't allow .py extension it has to be .mojo so no default nvim highlighting ...

$ mojo build mojo_benchmark.mojo

$ time ./mojo_benchmark

...

real 0m0.342s

user 0m0.080s

sys 0m0.252s

$ rustc rust_benchmark.rs

$ time ./rust_benchmark

...

real 0m0.107s

user 0m0.012s

sys 0m0.049s

I noticed a speed increase using fish shell instead of bash but could be the environment variable stack overload.

So in this specific test rust is much faster. And also the compiler suggests using _ instead i, that mojo compiler doesn't.

The rust binary is bigger, but is because the allocator is embedded:

-rwxr-xr-x 1 sha0 sha0 1063352 Jan 10 08:55 mojo_benchmark

-rwxr-xr-x 1 sha0 sha0 4632872 Jan 10 08:57 rust_benchmark

But Look this, mojo uses libstdc++ and libc and rust only uses libc.

$ ldd -d mojo_benchmark

linux-vdso.so.1 (0x00007ffd94917000)

libtinfo.so.6 => /lib/x86_64-linux-gnu/libtinfo.so.6 (0x00007fe899cb1000)

libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fe899a00000)

libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fe899921000)

libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fe899c91000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe899740000)

/lib64/ld-linux-x86-64.so.2 (0x00007fe899d2c000)

$ ldd -d rust_benchmark

linux-vdso.so.1 (0x00007ffde67b7000)

libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8b3881b000)

libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8b3863a000)

/lib64/ld-linux-x86-64.so.2 (0x00007f8b388ae000)

Lets check the binary.

All the python non used built-ins are written to the binary, so does rust in this case.

mojo

rust

Steps until libc write:

Mojo

Rust

Ok wait, rustc like cargo by default is on debug-mode which is the slower version, the way to do cargo --release which is much faster is rustc -O rust_benchmark.rs

real 0m0.107s

user 0m0.005s

sys 0m0.056s

This simple program don't make profit of the optimizations.

Rust

We reduced from 30 calls to 27.

I'm not going to criticize the number of calls because rust does his magic and result faster.

Mojo only 7 calls but runtime seems slower.

Regarding memory operations, seems that is rust like compiler-time borrow checked.

https://docs.modular.com/mojo/programming-manual.html#behavior-of-destructors

Rust decompiled

Rust disassembled

Mojo decompiled

Mojo disassembled

So we have two things: the crafted assembly speed, and specially the runtime speed.

Looking the Rust assembly, it's writing the string pointer to stack on every iteration which is same pointer in every iteration.

However Mojo loop is more optimized, param and address to call are pre-calculated before the loop.

So Mojo is generating optimized code, but its c++ API seems slower, at least the print()

Regards.

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sábado, 27 de janeiro de 2024

USE OF CRYPTOGRAPHY IN HACKING

The Cryptography is derived from the Greek words "Kryptos". This is the study of secure communication techniques that allow only the sender and recipient of a message to view it's contents of transforming information into nonhuman readable form or vice versa is called cryptography.

As we know that information plays a vital role in running of any business and organizations etc, sensitive details in the wrong hands can leads to loss of business.

Cryptography is the science of ciphering and deciphering messages.To secure communication organizations use cryptology to cipher information .

Or

Cryptography is a method of protecting information and communication through the use of codes so that only those whom the information is intended can read and process it.

In Computer Science, Cryptography refers to secure information and communication techniques derived from mathematical concepts , a set of rule based calculations called algorithm to transform message in ways the hard to readable for human.

This is one of the secure way of communications for a hacker with the help of virtual private network(VPN) like Tor Browser which is also very helpful to change the IP Address(Location of the sender ) for illegal purpose to perform crime in cyberspace . I will discuss in brief about the VPN .

How to Encrypt and Decrypt the text in Cryptography?

Open this website with the help of internert surfing for encryption-"http://wwwmd5online.org"

Open the link for Decrypt the code text-"http://www.md5online.org/md5-decrypt.html"

Type whatever you want for encryption and it will crypt in the code form, copy that code and forward to the intended person whom you want for secure communication and then he/she will Decrypt in the real form.

Related word

sexta-feira, 26 de janeiro de 2024

Hackerhubb.blogspot.com

Read more

How To Start | How To Become An Ethical Hacker

More information

Mojo Vs Rust, Basic Test And Binary Perspective.