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cryptography2
Cryptography 2Symmetric EncryptionSymmetric encryption or symmetric key or single-key encryption is an encryption system which the encryption and the decryption processes are preforms using the same...
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cryptography3
Cryptography 3Classical Encryption Techniques:As we mentioned earlier , the basic of all encryption techniques are based on 2 techniques 1- Substitution2- Transpositionand we can also use a combination...
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cryptography4
Cryptography 4Classical Encryption Techniques 2:B- Polyalphabetic Cipher:Polyalphabetic Cipher is an encryption method to improve the simple substitution cipher techniques by using a larger key space...
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cryptography5
Cryptography 5Classical Encryption Techniques:2- Transposition Cipher:Transposition Cipher is an encryption method which elements are rearranged.There are many types of Transposition Cipher such as...
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cryptography6
Cryptography 6Block CipherBlock cipher is an encryption method which the encryption algorithm operates on a plaintext block of n bits and produces a block of n bits ciphertext.Block Cipher has 2^n...
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cryptography7
Cryptography 7DES (Data Encryption Standered)DES :DES adopted in 1977 by (NIST) National Institute of Slandered and Technology).In DES data are encrypted in 64 bit block with a key length 56 bits and...
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cryptography8
Cryptography 8Finite FieldIn this section we will talk about something in abstract algebra, and i'm trying to make it painless and simple.Finite Fields is a vary important topic in cryptography and it...
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cryptography9
Cryptography 9Simplified AESSimplified AES is an educational algorithm to understand AES encryption algorithm , Simplified AES has the exact same structure of AES but with smaller parameters.Simplified...
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cryptography10
Cryptography 10AESAES takes a plaintext block 16 bytes (128 bits) and key length 16, 24, 32 bytes (128, 192, 256 bits) AES-128, AES-192, AES-256 depending on key length.The input to encryption or...
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cryptography11
Cryptography 11Pseudorandom Number Generation (PRNG)We uses PRNGs everyday over internet, network security applications and Protocols such as RSA and authentication algorithms.There are two...
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cryptography12
Cryptography 12RSARSA is a block cipher, the block size must be less than or equal .\(\log_{2}(n)+1\), if block size =i bits \(2^{i}<n<2^{i}+1\)The encryption and decryption are on the following...
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cryptography13
Cryptography 13Diffie-Hellman Key ExchangeDiffie-Hellman is a key exchange algorithm based on public key cryptography written by Diffie and HellmanDiffie-Hellman Algorithm :First we have to know the...
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cryptography14
Cryptography 14Elgamal Cryptographic SystemElgamal cryptographic system is a public-key algorithm based on discrete logarithm.Elgamal cryptographic system is used in digital signature standard...
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cryptography15
Cryptography 15Elliptic CurveElliptic curve is an equation with two variables and coefficients and it is a cubic equation like the following form:\(y^{2}+axy+by=x^{3}+cx^{2}+dx+e\)\(y^{2}=x^{3}\)Let's...
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cryptography16
Cryptography 16Hash FunctionsWhat is hash function ?!Hash function maps a variable length message into a fixed length hash value.Cryptographic hash function is an algorithm for which no attack is more...
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cryptography17
Cryptography 17Secure Hashing Algorithm (SHA)Secure Hashing Algorithm (SHA) is based on the hash function MD4 ,SHA was developed by National Institute of Standards and Technology (NIST) and published...
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cryptography18
Cryptography 18Digital SignatureDigital Signature is an authentication mechanism tha enable the creator of a message to attach a code that act as a signature.Digital Signature is formed by taking the...
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Secure browsing and Escaping firewall by using SSH
Secure browsing and escaping firewall by using SSHThis article about how to build a secure browsing environment and how to escape firewall rules or even escaping ISPs rules over browsing (HTTP and...
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