cryptograpy

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Basic idea of cryptography

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CRYPTOGRAPHY

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Plaintext – A message in its natural format readable by an attacker Ciphertext – Message altered to be unreadable by anyone except the intended recipients Key – Sequence that controls the operation and behavior of the cryptographic algorithm Key space – Total number of possible values of keys in a crypto algorithm

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Two basic components of classical ciphers: " Substitution: letters are replaced by other letters " Transposition: letters are arranged in a different order These ciphers may be: " Mon alphabetic: only one substitution/ transposition is used, or " Polyalphabetic: where several substitutions/ transpositions are used Product cipher: " several ciphers concatenated together

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Confidentiality Integrity Authenticity Nonrepudiation Access Control CRYPYOGRAPHY PROVIDES..

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SYMMETRIC CRYPTOGRAPHY

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Some examples of popular and well-respected symmetric algorithms: Twofish   Serpent AES  ( Rijndael ) Blowfish

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ASYMMETRIC CRYPTOGRAPHY

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PKC AS DIGITAL SIGN

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Diffie -Hellman RSA El Gamal Elliptic Curve Cryptography (ECC) ASSYMETRIC ALGOTIRM

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The art of war teaches us not on the likelihood of the enemy’s not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable. --The art of War, Sun Tzu

ANY QUERIES??:

ANY QUERIES??

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