Clip 05/04: Brian Holyfield of Gotham Digital Science hacking a Web service in general is not rocket science. But what will be, if the Web service messages sent using a binary protocol necessary? And if there is a message level requires encryption, but you do not have a key? These are some common scenarios you’re likely to encounter when they try to create a Web service using Windows Communication Foundation (WCF), built for the attack. Through a series of live demonstrations will show the presentation, how to recognize and attack the WCF web services and discuss useful tools and tips to facilitate testing of WCF services. Participants will leave with the skills necessary to effectively carry out penetration test against WCF apps. The following demonstrations will be performed live (time permitting): – Burp Plug-in for messages from WCF Binary SOAP (MC-NBFS) – De-compilation of Silverlight XAP to receive data Meta WCF – Crafting Meta Data Exchange (MEX) The application for the recovery of WCF meta-data – communication using WCF with WS-S Message Encryption Anonymous – create your own WCF Test Client (in less than 10 lines of code) – TCP port sampling by WCF duplex callback channels Presentation Outline: 1. Overview of Silverlight 2 WCF, WCF, Web Services 2. MC NBFS Protocol 2b. Get meta data for WCF 2c. Analyze Insurance WCF Silverlight XAP third 3rd Binding. WS-S Message Encryption 3b. Customers fourth custom WCF services WCF duplex fourth. Channels Offensive Call Back for more information and presentation …
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5.5 Speaker: Brian Holyfield of Gotham Digital Science hacking a Web service in general is not rocket science. But what will be, if the Web service messages sent using a binary protocol necessary? And if there is a message level requires encryption, but you do not have a key? These are some common scenarios you’re likely to encounter when they try to create a Web service using Windows Communication Foundation (WCF), built for the attack. Through a series of live demonstrations will show the presentation, how to recognize and attack the WCF web services and discuss useful tools and tips to facilitate testing of WCF services. Participants will leave with the skills necessary to effectively carry out penetration test against WCF apps. The following demonstrations will be performed live (time permitting): – Burp Plug-in for messages from WCF Binary SOAP (MC-NBFS) – De-compilation of Silverlight XAP to receive data Meta WCF – Crafting Meta Data Exchange (MEX) The application for the recovery of WCF meta-data – communication using WCF with WS-S Message Encryption Anonymous – create your own WCF Test Client (in less than 10 lines of code) – TCP port sampling by WCF duplex callback channels Presentation Outline: 1. Overview of Silverlight 2 WCF, WCF, Web Services 2. MC NBFS Protocol 2b. Get meta data for WCF 2c. Analyze Insurance WCF Silverlight XAP third 3rd Binding. WS-S Message Encryption 3b. Customers fourth custom WCF services WCF duplex fourth. Channels Offensive Call Back for more information and presentation …

Question by MAXimum: C++ Multidimensional array problem with Playfair cipher?
The assignment directions

The ‘playfair square’ is a digraphic matrix cipher. Digraphic means that it breaks its input into 2 character blocks and processes each block as a unit.

The matrix, like the sample below, is a 5×5 matrix with a 25 letter alphabet laid out in it in some mixed up order.

L M N O P
A B C D E
V W X Y Z
Q R S T U
F G H I K

For the sake of this, I will talk about “encryption.” However, decryption is just the opposite. REMEMBER: this problem explanation presents the encryption task. You are to write a DECRYPTION program (that is a program that given the encrypted input below, decrypts it to reveal the secret message) If you need a better explanation, look it up online, I can’t post more on here due to character limit.

YI UB EB IS KC SP UB EB FC AM CU QD SX

My issues

Once again, my teacher is leaving me to piece a number of puzzles together, but things like the current assignment at hand is something I was never really taught. No examples of a similar program were given either in my book or by my teacher. I’m not sure if I even made the matrix correctly or if there is an easier way to make it. I guess my biggest problem is comparing each pair with the matrix while incrementing the multi-dimensional array’s elements at the same time while using if-else statements.

Just as a sign that the output is correct for anyone who solves the program, the deciphered output should be “TO RE AC HT HE UN RE AC HA BL ES TA RX”, which is “To reach the unreachable star” in regular ol’ English. I figured this out using a piece of paper and the “fairplay” method.

If you don’t find the explanation of the “fairplay” very clear, you can look it up online. There are number of better explanations and illustrations out there.

The following program has some obvious flaws in it, namely the portions within the if-else statements that I am pretty sure are way off the mark. There is where I am having trouble, naturally.

Thanks in advance.

My program so far
:#include
using namespace std;

//begin program,’
int main()
{
//declare multi-dimensional array with 5×5 matrix for ciphering
char cipherArray[5][5];
//use char input array containing “YI UB EB IS KC SP UB EB FC AM CU QD SW”
char inputArray[] = {‘Y’,'I’,'U’,'B’,'E’,'B’,'I’,'S’,'K’,'C’,'S’,'P’,'E’,'B’,'A’,'M’,'C’,'U’,'Q’,'D’,'S’,'W’};
//use char output
char outputArray[50];
int size = 0, size1 = 0, size2 = 0, temp;
cipherArray[1][1] = ‘L’, cipherArray[1][2] = ‘M’, cipherArray[1][3] = ‘N’, cipherArray[1][4] = ‘O’, cipherArray[1][5] = ‘P’;
cipherArray[2][1] = ‘A’, cipherArray[2][2] = ‘B’, cipherArray[2][3] = ‘C’, cipherArray[2][4] = ‘D’, cipherArray[2][5] = ‘E’;
cipherArray[3][1] = ‘V’, cipherArray[3][2] = ‘W’, cipherArray[3][3] = ‘X’, cipherArray[3][4] = ‘Y’, cipherArray[3][5] = ‘Z’;
cipherArray[4][1] = ‘Q’, cipherArray[4][2] = ‘R’, cipherArray[4][3] = ‘S’, cipherArray[4][4] = ‘T’, cipherArray[4][5] = ‘U’;
cipherArray[5][1] = ‘F’, cipherArray[5][2] = ‘G’, cipherArray[5][3] = ‘H’, cipherArray[5][4] = ‘I’, cipherArray[5][5] = ‘K’;
//use for-statement to check input array with cipher array
for (size = 0; size < 23; size + 2)
{
inputArray[size]=cipherArray[size1][size2];
inputArray[size + 1]=cipherArray[size1][size2];
//within for-statement create if-else statements for special cases
//if pair is in same row move one space left in the cipher array. Use wrap around feature
if (size == size + 1 || size == size - 1)
{
size1++;
}
//if pair is on same column move one space down in the cipher array. Use wrap around feature
else if (size == size + 1 || size == size - 1)
{
size2++;
}
//if pair is the same letter move one space left as if on the same row
else if (size == size + 1 || size == size - 1)
{
size1++;
}
//else the pair is boxed. Swap sizes with column number of counterpart and remain on the same row.
else
{
temp = size1;
size1 = size2;
size2 = temp;
}
}
//set output array equal to deciphered input array
outputArray[size]=inputArray[size];
//print output array to screen
for (size = 0; size < 23; size + 2)
cout << outputArray[size] << outputArray[size+1] << " &qu

Best answer:

Answer by mdigitale
First of all, you may want to double check your cipher-text — I believe your test message, TOREACHTHEUNREACHABLESTARX
would be enciphered as:
IDUBBAISKCSPUBBAFCAMCUQDSW

If I was writing a decryption routine for this, here is the pseudo code approach I would probably take:

1. Define key matrix (read from user or define static in the code)
2. Obtain the cipher text from the user
3. Get first two letters from cipher text (a,b)
4. Find a in key matrix. Note matrix coordinates ax, ay.
5. Find b in key matrix. Note matrix coordinates bx, by.
6. Does ax == bx? If so, then execute the column transformation.
7. Else does ay == by? If so, then execute the row transformation.
8. Else execute the rectangle transformation.
9. Get next 2 letters in cipher text. Goto (4).

column transformation:
sub one from the ay coordinate, ensure >= 0. If not, ay = 4. Lookup key[ax,ay]
sub one from the by coordinate, ensure >= 0. If not, by = 4. Lookup key[bx,by]
row transformation:
sub one from ax coordinate, ensure >= 0. If not, ax = 4. Lookup key[ax,ay]
sub one from bx coordinate, ensure >= 0. If not, bx = 4. Lookup key[bx, by]

rectangle transformation:
temp = ax;
ax = bx
bx = temp
Lookup key[ax, ay]
Lookup key[bx, by]

What do you think? Answer below!

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Home Page > Computers > Security > All about Encryption

All about Encryption

Posted: Jan 21, 2010 |Comments: 0
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Encryption

Encryption and science and art of writing messages in encrypted form or in code. And part of a field of study that deals with secret communications, used, among other purposes, to:

• authenticate the identity of users;
• authenticate and protect the confidentiality of personal communications and commercial transactions and banking;
• protect the integrity of electronic funds transfers.

A message encrypted by an encryption method should be private, that is, only those who sent and received that should have access to the contents of the message. In addition, a message should be, that is, the person who received it must verify that the sender and even someone who claims to be and be able to identify whether a message may have been modified.

The current encryption methods are safe and effective and based on the use of one or more keys. The key and a string that can contain letters, digits and symbols (such as a password), and and converted into a number, the methods used to encrypt and decrypt messages.

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Currently, cryptographic methods can be divided into two broad categories, according to the type of key used: a single key cryptography and public key cryptography and privacy.

What is encryption of unique key?

A single key cryptography uses the same key to both encode and decode messages. Although this method is quite efficient in relation to the processing time, ie the time taken to encode and decode messages, the main disadvantages is the use of a secure environment for the key can be shared between persons or entities wishing to exchange encrypted information.

What is cryptography of public and private key?

The public key cryptography and private uses two different keys, one to encode and decode messages to another. In this method each person or entity has two keys: one public, which can be freely disseminated, and one private, which must be kept secret by its owner.

Messages encoded with the public key can only be decrypted using the corresponding private key.

Be the example, where Joseph and Mary want to communicate confidentially. So they have to perform the following procedures:

1. José encodes a message using the public key of Mary, which is available for the use of any person;

2. Once encrypted, José sends the message to Mary, through the Internet;

3. Maria receives and decodes the message using its private key, and that only their knowledge;

4. If Mary want to answer the message, you must perform the same procedure, but using the public key of Joseph

Although this method has much lower performance compared to processing time, when compared with the encryption key only, has the major advantage of free distribution of public keys, not requiring a secure environment so that keys are combined in advance.

Moreover, it can be used to generate digital signatures.

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Luis miguel love software especially the POS Software system. Visit this at POS Software system and see the Pos Software

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Clip 2/5 Speaker: Brian Holyfield, Gotham Digital Science Hacking a web service generally isn’t rocket science. But what if the web service requires messages to be sent using a binary protocol? What if it requires message level encryption but you don’t have a key? These are just a few common scenarios you are likely to encounter when trying to attack a web service built with Windows Communication Foundation (WCF). Through a series of live demonstrations, the presentation will show how to identify and attack WCF web services and discuss useful tools and tips to make testing WCF services easier. Attendees will leave with the knowledge necessary to effectively conduct penetration testing against WCF applications. The following live demonstrations will be conducted (time permitting): – Burp Plug-in for WCF Binary Soap Messages (MC-NBFS) – De-compilation of Silverlight XAP for obtaining WCF Meta Data – Crafting Meta Data Exchange (MEX) Requests for Retrieving WCF Meta Data – Communicating with WCF using WS-S Anonymous Message Encryption – Writing a Custom WCF Test Client (in less than 10 lines of code) – TCP Port Probing through WCF Duplex Callback Channels Presentation Outline: 1. WCF Overview 2. Silverlight WCF Web Services 2a. MC-NBFS Protocol 2b. Obtaining Meta Data from WCF 2c. Analyzing Silverlight XAP 3. Secure WCF Binding 3a. WS-S Message Encryption 3b. Custom WCF Clients 4. WCF Duplex Services 4a. Attacking Callback Channels For more information and presentation …
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Speaker

Clip 05/01: Brian Holyfield, Gotham Digital Science Hacking a Web service generally is not rocket science. But what if the Web service requires that messages are sent using a binary protocol? What is required encryption, but you have shown no key? These are some common scenarios that are likely to encounter when they try to create a Web service using Windows Communication Foundation (WCF), built for the attack. Through a series of live demonstrations will show the presentation, how to recognize and attack the WCF web services and discuss tips and useful tools to facilitate testing of WCF services. Participants will leave with the skills necessary to effectively perform penetration tests against WCF applications. The following demonstrations will be performed live (time permitting): – Burp Plug-in for WCF binary messages (SOAP NBFS MC) – De-compilation of Silverlight XAP for the preservation of meta data WCF – Crafting Meta Data Exchange (MEX) applications recovery WCF metadata – communication with WCF WS-S Message Encryption Anonymous – create your own WCF Test Client (in less than 10 lines of code) – TCP port probing the WCF duplex callback channels Presentation Outline: 1. Overview 2 WCF Silverlight WCF Web Services 2. MC NBFS Protocol 2b. Meta Data retrieval WCF 2c. Analyze Insurance WCF Silverlight XAP third third Binding. WS-S 3b Message Encryption. Customers fourth custom WCF Services WCF Duplex fourth. Call Back offensive channels for more information and presentation …
Video Rating: 05/05