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+--- Thread: cryptography (/Thread-cryptography--40606)
cryptography - chipp - 03-11-2012
we can discuss anything about cryptography here... can anyone give some explanations about cryptography?
RE: cryptography - Apathetic1 - 03-12-2012
Well, what form of cryptography would you like to speak about? Or would you like the basic "hides data" explaination?
RE: cryptography - Insidious. - 03-12-2012
Well, it's basically what it means. If you've ever heard of a crypter, or used one (most people use it for "hiding" or making their infections fully "undetectable") - same thing with cryptography. Basically, it can do anything. Hide data or "crypt" data, in general have a specific password hiding under cryptography, etc.
RE: cryptography - Apathetic1 - 03-12-2012
(03-12-2012, 01:59 PM)Insidious. Wrote: Hide data or "crypt" data, in general have a specific password hiding under cryptography, etc.
Generally passwords are hashed, not encrypted.
RE: cryptography - Insidious. - 03-12-2012
(03-12-2012, 05:40 PM)Apathetic1 Wrote:(03-12-2012, 01:59 PM)Insidious. Wrote: Hide data or "crypt" data, in general have a specific password hiding under cryptography, etc.
Generally passwords are hashed, not encrypted.
This.
Sorry for my shitty reply the smornin' I didn't have my coffee. It was actually 5AM because I had daylight savings and forgot, so... I'll be more clear on the subject and have you figure out the rest.
If you know what crypters are, you know what they do. Basically, they make files or people's viruses / infections fully undetectable so the victim does not notice he or she IS infact infected. Basically, cryptography is a way to hide data, or anything of the sort. Now, there are different types of cryptographys and hashes (which can technically be the same - sometimes).
RE: cryptography - Apathetic1 - 03-12-2012
Quote:Sorry for my shitty reply the smornin' I didn't have my coffee. It was actually 5AM because I had daylight savings and forgot, so... I'll be more clear on the subject and have you figure out the rest.
aha! Trust me, I know the feeling.
Should also be worth mentioning, if using a normal crypter their signature gets picked up quite quickly if you're hitting a mass amount of computers. However polymorphic crypters work in a way that everytime a stub is created (or if good, the PE starts) the signaturewill change.
Still no input from OP so not sure what kind of cryptography he wants to talk about or how detailed!
Apathetic1
RE: cryptography - Frooxius - 03-13-2012
Hiding data is not really what cryptography does, it's steganography - science that conceals the existence of given data in the transformed information. For example, you can encode some data in LSB's of pixels of some image, so you can for example embed a text message in a completely unrelated image and thus hide this message: anybody who looks at the image won't have a clue that it in facts has some data hidden in it. If nobody has a clue that some innocent picture contains hidden message, they won't even attempt to extract the data.
Cryptography on the other hand doesn't hide the data per se, it only performs certain transformations that make them impossible for someone to read without knowledge of the encryption method and key used. Simply, it doesn't hide the data, it just makes it look like gibberish to someone without ability to decrypt it, but doesn't prevent drawing attention to the data.
Steganography and cryptography can be used together however: the data that you hide are encrypted, so even in case someone discovers their presence, they still won't be able to read them without decrypting, not to mention that encryption can prevent detection in the first place as it might seem just as an random noise.
RE: cryptography - chipp - 03-21-2012
btw, what about the classics encryptions like caesar's ? or base64? does anyone would explain it? or any modern cryptographic techniques...
RE: cryptography - Frooxius - 03-30-2012
Base64 isn't an encryption, it's a method to express binary data using a subset of printable ASCII characters, in order to transfer them via ASCII based transfer channels, as opposed to binary transfers. For example, it is used for email attachments, because email messages are sent as pure text, so the binary files need to be included in a text form, so base64 usually comes to the play, but it doesn't protect the data anyhow by itself, it's just a different way to express them in their raw, unchanged form.
RE: cryptography - chipp - 04-02-2012
thanks for the information. btw, as far as i know, hash is not an encryption but does anyone has an explanations about it?