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1st: What do you mean by &quot;perfect&quot; alghoritm - usually, regarding encryption, there are two basic approaches (and some derivations): shared key encryption and public encryption ?<br />
2nd: What are you talking about - is it about Digital Signatures?<br />
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Cheers.<br />
<br />

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1st: What do you mean by "perfect" alghoritm - usually, regarding encryption, there are two basic approaches (and some derivations): shared key encryption and public encryption ?
2nd: What are you talking about - is it about Digital Signatures?

Cheers.



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I am studying XOR's and mod'ing algorithms. &nbsp;I am just wondering if anyone already knows what probabilities are w/ existing technologies (block ciphers, and stream ciphers using symetric cryptography). &nbsp;
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I am studying XOR's and mod'ing algorithms.  I am just wondering if anyone already knows what probabilities are w/ existing technologies (block ciphers, and stream ciphers using symetric cryptography).  

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i could crunch that in 1 day, plain text is far from perfect :D (pun intended)
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i could crunch that in 1 day, plain text is far from perfect :D (pun intended)

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For a &quot;perfect&quot; encryption algorithm, what is the probability an attacker can guess an arbitrary bit in the plain text given a set of k cipher text?
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For a "perfect" encryption algorithm, what is the probability an attacker can guess an arbitrary bit in the plain text given a set of k cipher text?

Encryption

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.