I looking for an algoritm to encrypt some data sent from a c program(client) to a php server(can be in perl or cgi-bin) over the internet. How should i send it in c? Some http call? Or it can be in via a perl script. Then i need some basic algoritm to encrypt it. Any ideas. How do i save the key in the c program? Just something basic so its not clear text. This is not for a bank or visacards etc
View 2 RepliesI need to implement AIDE on my client machines. The builds on these machine are different, so each workstation will have its own specific db generated through running AIDE initially. It is not good practice to just leave the db on the machine, since an "attacker" would be able to view this information. However, at the same time I do not want to pull back over 100 different aide db's to the ftp server and have an update pull each specifically every time I need to run the check. The plan is to leave the db on the client machine, but encrypt it (using public/private keys). I need to be able to encrypt the file on the client machine. I will use a cron on the client to pull an update (from my ftp server) that runs AIDE. This update needs to be able to decrypt the file, use it running AIDE, then re-encrypt the file on the client.
View 1 Replies View RelatedWhen you install sshd and run it with no modifications, then any other machine can connect to your machine without specifying a key. How does this work? Some key is being used, correct? how does the client know what private key to use?
View 14 Replies View Relatedi have a server program which accept multiple client connection and am using polling. like every 2 secs it will look to client whether any data is received after it binded. i have used setitimer but there is runtime error i got.. the server accept all client connection but doesn't execute any msg which client sent.
#include<stdio.h>
#include<stdlib.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<netdb.h>
#include<unistd.h>
#include<pthread.h>
#include<string.h>
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I use rtorrent in slackware. I already tried to use deluge 1.2.3 and even 1.3rc1 and 1.3rc2 but I find them a little unstable. Witch is your favorite? For lot of torrents and maximum encryption?
View 14 Replies View RelatedIn all the examples I have found the server accepts the client's conection, proccess the data received and close the socket. In an very schematic way it would be something like:
Code:
client_thread{
select to see if there is data to read from socket fd
if there is something to read{
[code]....
Should I use mutexs or semaphores to block the socket fd before read and write or it is not necesary?
I have a problem creating my second socket in client file. the program was running well but when I try to add another socket to connect to the same server, I got a problem connecting to the first socket! it doesn't make sense. the original code was:
sockfd[i] = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd[i] < 0) error("(MAIN) - Error openning socket 1");
port_num[i] = portno;
bzero((char*) &serv_addr[i], sizeof(serv_addr[i]));
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I want to built a Chat Program (based on Socket connection) between client and server. I use the GTK+ &GLADE graphic tool. Can you send me the code for this program or any material to learn. Also, I want to know how to show the input to text view (in GTK+&Glade).
View 3 Replies View RelatedI am getting this error when i try to connect a client to a server in windwos ,anybody knows why ?
View 3 Replies View RelatedI have written a server application which has select for both incoming new client connection requests and incoming data from client. I am able to process incoming connection requests and client data.
For example, server has 8 clients connected to it. If client 3 disconnects from server, how will server come to know this client has disconnected and to close its client socket fd gracefully? Does server's select get data on that client socket fd as 'close' data or any error code in recv() function that notifies server to close this client socket fd? Also if client disconnects abruptly without sending close request to server, how should server handle this? Does server get "EPIPE" error?
I am new in client server programming and i have written code for single server to single client communicating one port(3490). but i have no idea how my single server will be communicate with different client on different port.how this will be happen ?
Any idea to understand the logic or send any good link or any piece of code in c , i searched on net but all help was mostly for java progamming.
I wrote a simple client server socket program in C.
View 1 Replies View RelatedReading some examples on net and copying some codes I was able to build a (frankstein) server that accept connection from one client and receive and send messages to it. The big problem that shows up is that I don't know when client disconnects from my server.
I've been looking for a solution, but no success. I'd read about SO_KEEPALIVE option (which could solve my problem), but I don't know how to use it (how to check the value of it).
I can't use ping because the server (machine) could be running, but not the client (software).
Anyone knows a good tutorial or how to (for beginners like me xD) of TcpIp sockets using c/c++ and how to detect when a client disconnect?
I don't know sockets very well.
If you have a proxy and receive/send data from/to both the client and the server,is there a way to test what part has data to send(client or server) ?
View 1 Replies View RelatedI configured openLdap in RHEL5 on virtual achines,everything is working fine, I created a user called ldapuser,in LDAP server and i created a home directory for ldapuser in my LDAP client, now i can able to login to the both Server and client with ldapuser account....
Now here what am expecting is i want to export my server's home directory to the client, i dont want to create home directories manually in the client machine, i googled about that, and it can be done through autofs.....
what need to be done on the client and server side.
I am writing a TCP server in C, and the server listens to incoming client connections and accepts them. It then creates a thread to handle the client. The clients are expected to only receive data from my server and not send any data. So if I use a select() call with a recv(), I believe that the recv() will just block forever since there will not be any data coming from the client. If I use a non-blocking recv(), then this will just return a 0 which tells me nothing because the client is not expected to send any data. I am not sure if I have misunderstood some socket concepts, but I need a solution to detect when the client has disconnected so that I can close the socket and stop sending data to the client. As I understand it, simple ACKs etc are not captured by the recv(), and only data sent by the client will cause recv() to return a non-zero value, so I am not sure how to know when the client has disconnected.
View 7 Replies View RelatedHow to decrypt a file in openssl which is encrypted in perl using crypt cbc
View 2 Replies View RelatedI want to encrypt a text using rsa encryption method. I did it using command openssl but i want it using my library api, the library api is as, int rsa_calc (unsigned char * msg, unsigned char * mod, int count, int exp, unsigned char result); I can't understand how i input public key (.pem file) and what will be the modulus (unsigned char * mod) and exponent (int exp) for any text.Is there any kind of formula to calculate modulus and exponent of the text.
View 2 Replies View RelatedI have a simple class that encrypts strings. It seemed to be working fine until I tried to compare the decrypted values to the original. below is the output of the php code. It appears to be decrypted but the length is incorrect.
String Before Encryption: a text string
String Length Before Encryption: 13
String After Encryption: rew2iSYotruIpmJ3llos3A==
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i need a program for Encryption and Decryption using RSA algorithm in JAVA ..
View 9 Replies View RelatedI am having trouble with encryption/ decryption program. The program goes out and finds the file I want it to, encrypts it into a continuing series of a single repeated negative number, then generally decrypts(or should i say re-encrypts)it into a widely repeated character, different but same results every time.
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I have question about the UNIX sockets. my goal is to connect multiple sockets from a single client to a single server and keep them open...I'm not sure if that is possible to create or not. Do you have any suggestion or an example of code?
View 1 Replies View RelatedI'm trying to write a GUI text encryption application. I wrote the encryption system in a No GUI application like this::
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Now I'm trying to write a GUI version, using the same algorithm. Here goes a rough image of my main window code. If you scroll down you'll observe a coloured part. As you see, the text in the first textbox gets copied into clipboard. That is the part where my encryption system should encrypt the data in the clipboard, and copy it again, and later on the new data will be pasted. How am I supposed to write that? If I have to use another signal, what is the receiver of that signal?
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I have a Nis server on Suse 11 which is configured using Yast and nis clients on Suse and CentOs .All clients which is on the Suse Os is working fine. But on CentOs , users couldn't login using nis username.I have mounted home directory using nfs in fstab . I can switch to nis users homedirectory only when i am root. But nis users could'nt login on reboot.' ypcat passwd username ' is showing the output . No selinux is enabled in the client .Is there is any problem with Suse server to Centos Client in nis ??
View 2 Replies View RelatedI have a server listening on incoming client connections. Once the client establishes SSL connection with the server, the server waits on read() from the client. Only Client can disconnect the connection. I want to have a timer in the server program to wait for x secs after read() and then disconnect the Client connection.
View 3 Replies View Relatedhow much of a performance impact full disk encryption (say, AES 256-bit) has on disk-related activities? On one particular project I'm involved in I am trying to weigh out security vs performance issues.
View 1 Replies View RelatedIs it possible to swap a client ip and port ? This is what I am trying to do. Let say you have Comp1 and Comp2 And you have Server between them. My goal is to get Comp1 and Comp2 know each others IP So Comp1 connects to server And server stores comp1's IP In a text file or other place And Comp2 connect to server And server also stores his info And then both comp1 and comp2 dowload the tex file And use the info on it.
View 9 Replies View RelatedWhen I user wants to navigate through the internet, he must first give his username and password. The password is sent in clear text. I would like to encrypt this using SSL (or an other solution already integrated in Squid). Is this possible in Squid?I read that "user_cert" option can do this, but I couldn't configure it.I have: acl myacl user_cert src 192.168.1.5Which gives: "aclParseAclLine: Invalid ACL type 'user_cert'"The other solution is probably tunneling, but I don't want to install special software on the client machines
View 1 Replies View RelatedI would like to request the software which can ensure the confidentiality of the files which stored in samba server.
View 1 Replies View RelatedI didn't know if I should have posted this in newbie, hardware, or server. I haven't used tape drives in Linux previously; however I'm trying to figure out how to enable an LTO-4 tape drives built in encryption. Im not that concerned with secure key management, I am looking to just being able to load a key into the drive and get the tape to encrypt. Im for a simple command, but I dont even know where to start. If it varies by device, its an HP Ultrium 4 (1760).
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