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Encryption is handled in the form of ciphers. A cipher can be a simple as a character substitution. For example, if a message is to be sent over an untrusted medium, the message might be, We attack at dawn. This text is called the plaintext, and is human readable. Using a simple cipher called ROT13, the ciphertext, or encrypted text, is Jr nggnpx ng qnja. This substitution simply replaces each letter of the alphabet with a character 13 places to the right of it. For example, e becomes r, and w becomes j. The party receiving the message then has to replace each character with the letter 13 places to left in the alphabet, which can span the beginning or end of the alphabet. These are called symmetric ciphers because the same key is used to encrypt and decrypt a message. This is obviously an example of weak cryptography, but it illustrates some key points. Poor encryption is trivial to break. Replacing a single letter with another letter often takes very little time to decode. Patterns can easily be discovered in the ciphertext to assist with decoding the message. For example, if a character occurs more often than any other character, and the plain text message is English, that letter probably represents the letter e. Attacks can be made against encrypted messages. Encrypted messages can be sniffed on a network; therefore strong cryptographic algorithms should be utilized to thwart potential attacking efforts.

*/ */

3. Build and run the solution by pressing Ctrl+F5. You should see the result in Figure 12-12.

/* Get the new string length */ /* Start at the first character */

if(input[index]== '=') /* Is there = */ index++; /* Yes so skip over it */ else { /* No - look for the left operand */ /* Look for a number that is the left operand for the 1st operator */ /* Check for sign and copy it */ number_length = 0; /* Initialize length */ if(input[index]=='+' || input[index]=='-') /* Is it + or - */ *(number_string+number_length++) = *(input+index++); /* Yes so copy it */ /* Copy all following digits */ for( ; isdigit(*(input+index)) ; index++) *(number_string+number_length++) = *(input+index);

Figure 12-12. Running a stored procedure with C#

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The simple substitution cipher given in this example is keyed by the number of letters to rotate the alphabet by Because there are only 25 possible values for this key, it is about 4 bits in length, thus extremely weak Ciphers depend on a shared key If a shared key is agreed upon, ahead of time by both the sender and receiver of a message, the encryption is much stronger An attacker will then need a sniffed (intercepted) ciphertext message and a key to decode it properly Strong ciphers also produce ciphertext that will contain higher degrees of randomness than most normal written languages This description of ciphers is fairly high level To administer OpenSSH, no knowledge of how a cipher is created is required For performance optimization or security concerns, however, knowing which ciphers to choose and their key length can come into play.

/* Is it a digit */ /* Yes - Copy it */

/* copy any fractional part */ if(*(input+index)=='.') /* Is it decimal point */ { /* Yes so copy the decimal point and the following digits */ *(number_string+number_length++) = *(input+index++); /* Copy point */ for( ; isdigit(*(input+index)) ; index++) /* For each digit */ *(number_string+number_length++) = *(input+index); /* copy it */ }

This wasn t much different from CommandReader.cs in 6. The biggest difference is how you created and configured the command:

*(number_string+number_length) = '\0';

There are two main types of symmetric ciphers utilized in computing today: block and stream ciphers Both of these types of ciphers are supported in OpenSSH Block Ciphers Block ciphers are used to encrypt data of a fixed length in conjunction with a shared key For example, if a cipher is using a 128-bit block of clear text, the encrypted text would be 128 bits The way the encryption occurs is dependent on the key and cipher algorithm Decryption of block ciphers requires the shared key and using the decryption algorithm Ciphers are generally a fast solution to encryption, but they present a problem of transmitting a shared key to the receiving party without it being compromised DES DES, or the Data Encryption Standard, was published in the late 1970s as an encryption standard for the United States Government.

/* Append string terminator */

// create command SqlCommand cmd = conn.CreateCommand(); // specify stored procedure to execute cmd.CommandType = CommandType.StoredProcedure; cmd.CommandText = "sp_select_all_employees";

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