Steganography is the art and science of writing hidden messages in such a way that no one apart from the sender and intended recipient even realizes there is a hidden message.
By contrast, cryptography obscures the meaning of a message, but it does not conceal the fact that there is a message.
Generally, a steganographic message will appear to be something else: a picture, an article, a shopping list, or some other message. This apparent message is the covertext. For instance, a message may be hidden by using invisible ink between the visible lines of innocuous documents.
The advantage of steganography over cryptography alone is that messages do not attract attention to themselves, to messengers, or to recipients. An unhidden coded message, no matter how unbreakable it is, will arouse suspicion and may in itself be incriminating, as in countries where encryption is illegal.
Often, steganography and cryptography are used together to ensure security of the covert message.
By contrast, cryptography obscures the meaning of a message, but it does not conceal the fact that there is a message.
Generally, a steganographic message will appear to be something else: a picture, an article, a shopping list, or some other message. This apparent message is the covertext. For instance, a message may be hidden by using invisible ink between the visible lines of innocuous documents.
The advantage of steganography over cryptography alone is that messages do not attract attention to themselves, to messengers, or to recipients. An unhidden coded message, no matter how unbreakable it is, will arouse suspicion and may in itself be incriminating, as in countries where encryption is illegal.
Often, steganography and cryptography are used together to ensure security of the covert message.
1 comment:
Stegnography sounds to me a very interesting security technique. I am not completely aware about it but heard the name many times. I was taking both these terms similar but this article cleared my myth.
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