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Understand PHP hash function, enhance password security _php tutorial

!"; } function Check_password ($hash, $password) { First characters include algorithm, cost and salt Let's call it $full _salt $full _salt = substr ($hash, 0, 29); Run the hash function on $password $new _hash = Crypt ($password, $full _salt); Returns TRUE or False return ($hash = = $new _hash); } Run it and we'll see "Access granted!" 8. Integrate themBased on the above discussion, we have written a tool class: Copy CodeThe code is as follows: Class Passhash { Blowfish private static $

FFmpeg parameter description

^ qcomp. -Rc_override: speed control overload at a specific interval -Me method: the available methods for setting motion estimation are zero phods log X1 EPZs (default) full -Dct_algo algo: sets the DCTAlgorithmAvailable 0 ff_dct_auto default DCT 1 ff_dct_fastint 2 ff_dct_int 3 ff_dct_mmx 4 ff_dct_mlib 5 Ff_dct_altivec -Idct_algo algo: sets the IDCT algorithm. There are 0 ff_idct_auto default IDC

Iptables Implementing string Matching

iptables implementing string MatchingCategory: Shelllinux commands2012-07-03 18:25 3172 people read reviews (0) favorites reportStringinputtcpoutputhexlinuxFilter by string matching domain name, examples are as follows:Iptables-i output-p tcp-m string--string "qq.com"--algo bm-j dropiptables-i output-p udp-m string--string "qq.co M "--algo bm-j DROPThis will not be able to access QQ-related business, but th

FFmpeg introduction and parameter description

Scale compression (VBR) -The initial complexity of rc_init_cplx complexity Encoding -B _qfactor: QP factor between P and B frames -The QP factor of I _qfactor between P and I frames -QP deviation of B _qoffset offset between P and B frames -QP deviation of I _qoffset offset between P and I frames -Rc_eq equation: sets the default bitrate control equation Tex ^ qcomp. -Rc_override: speed control overload at a specific interval -Me method: the available methods for setting motion estimation are z

FFmpeg parameter description-Chinese

: speed control overload at a specific interval -Me method: the available methods for setting motion estimation are zero phods log X1 EPZs (default) full -Dct_algo algo: sets the DCTAlgorithmAvailable 0 ff_dct_auto default DCT 1 ff_dct_fastint 2 ff_dct_int 3 ff_dct_mmx 4 ff_dct_mlib 5 ff_dct_altivec -Idct_algo algo: sets the IDCT algorithm. There are 0 ff_idct_auto default IDCT 1 ff_idct_int 2 ff_id

Linux I2C driver architecture

Linux I2C driver architecture1. Linux I2C driver architecture in Linux, I2C BUS drivers are divided into two parts: BUS and DEVICE drivers ). The role of the bus driver is to add corresponding read/write methods for each I2C bus in the system. However, the bus driver does not communicate with each other. It only exists and waits for the device driver to call its function. A device driver is a driver that communicates with a specific device mounted on the I2C bus. Using the functions provided by

[Reprint] use of FFMPEG

(implies VBR) Select the pass number (1 or 2 ). it is useful to do two pass encoding. the statistics of the video are recorded in the first pass and the video at the exact requested bit rate is generated in the second pass. select two pass log file name to file."Advanced Video options" Set the group of picture size use only intra frames use fixed video quantiser Scale (VBR) min video quantiser Scale (VBR) Max video quantiser Scale (VBR) max difference between the quantiser Scale (VBR) Video qua

Basic iptables commands in Linux

172.18.42.200-d 0/0-p tcp-m multiport -- sports 80, 22-A ACCEPT (2) iprange Extension: specifying a consecutive IP address range as the source address or target address match[!] -- Src-range from [-to]: source IP address;[!] -- Dst-range from [-to]: Destination IP address;[Root @ bkjia ~] # Iptables-a input-d 172.18.42.200-p tcp-dport 80-m iprange -- src-range 172.18.42.1-172.18.42.100-j ACCEPT[Root @ bkjia ~] # Iptables-a output-s 172.18.42.200-p tcp-sport 80-m iprange -- dst-range 172.18.42.1

Common PHP functions and tips

Common PHP functions and tipsPassword Encryption and Verification Password_hash-hash used to create a password) string password_hash ( string $password , integer $algo [, array $options ] ) Currently supported algorithms ($ algo parameter): 1. PASSWORD_DEFAULT-use the bcrypt algorithm (default for PHP 5.5.0 ). Note that this constant will change with the addition of PHP to update more intensive algorithms.

& Lt; Basic consolidation & gt; binary tree traversal

Introduction: Here we will review the basic operations of the binary tree. Here we assume that we define an ordered binary tree, that is, for any node, if there is a left subnode, the value of the Left subnode must be smaller than this node, if there is a right child node, the value of the right child node must be greater than that node. Here we also show the code to show how to traverse the binary tree in the forward, middle, and backward directions. Practice: First, we define a binary tree no

Detailed iptables usage

172.16.0.1-172.14.100.254-M state -- state new, established-J accept Stirng is limited by a string.# String-based Chinese Character matching capabilities are limited, but it can match English letters, and Pinyin is very useful.-- Algo BM | the algorithm used by KMP for matching. You must select one.BM developed by Boyer-Moore KMP by knuth-Pratt-MorrisExample: Access to QQ.com is denied.Iptables-a forward-M string -- string "QQ.com" --

PHP Encryption and decryption

Password_hash(String$password, integer$algo[, Array$options] )EncryptTo generate a 60-bit string $algo: A cryptographic algorithm constant used to indicate the algorithm when hashing a password, $options: There are two values, the first cost value is encrypted, the higher the value consumes the larger the memory, the default is 10, and the second salt hash of the password is the value (salt). T

PHP is more secure than MD5 encryption method--hash password

functions.Password hashing mainly provides 4 functionsView information about the hash value array Password_get_info (string $hash)//Create a hash password string Password_hash (string $password, Integer $algo [, Array $options])//Determine if the hash password is a specific option, the algorithm creates a Boolean Password_needs_rehash (String $hash, Integer $algo [, array $options] Boo Lean password_verify

Linux (vi) Samba servers and firewalls

all-s Source IP--sport Source Port-D destination IP--dport destination port-j actionIptables-a input-i eth0-p tcp-s 192.168.140.0/24--dport 22-j DROPIptables-a input-i eth0-p tcp-s 192.168.140.0/24--dport 137:139-j ACCEPTWhen specifying a port, the protocol cannot use all, to specify the exact protocol5 Module invocation1)-m Module name module option load iptables function module-M State--state established,relatedIptables-a input-i eth0-m State--state established,related-j ACCEPTState Status Mo

Application and explanation of iptables command under Linux

network to access the machine via 20, 80 portsIptables-a input-s 172.16.0.0/16-p tcp-m multiport--dports 20,80-j ACCEPT②iprange extension indicates a contiguous (but generally not an entire network) IP address range[!] --src-range from[-to] Source IP address range[!] --dst-range from[-to] Destination IP address rangeExample: Deny 172.16.100.5-172.16.100.10 This segment's IP access native via TCP80 PortIptables-a input-p TCP--dport 80-m iprange--src-range 172.16.100.5-172.16.100.10-j DROP③mac Ex

Linux security iptables Firewall detailed 1

input-s 1.1.1.1/24-d 172.16.80.116-p tcp-m multiport--dports 22,80-j ACCEPTIPRange extensionIptables-a input-d 172.16.80.116-p tcp--dport 80-m iprange--src-range 172.16.80.90-172.16.80.95-j ACCEPTString extensionstring pattern matching detection for application layer data in messages--algo String Matching algorithm--string pattern of strings to be detectedIptables-a output-d 172.16.80.116-p tcp--sport 80-m string--

Summary and application of Linux Iptables

-192.168.1.24--dst-range: Indicates the scope of the destination address, using the same--src-rangeMultiport: Indicates multi-port, only for TCP and UDP protocols--sports: Indicates multiple source portsExample:--sports 21,22,80,53--dports: Indicates multiple destination ports--ports: Indicates multiple ports, which include the source and destination portsConnlimit: Limit the number of concurrent connections--connlimit-above: Number of concurrent connections for the same client--connlimit-msak:

Linux I²c Device driver Authoring (ii)

-core:attempt to Register an adapter with "no name!\n"); Return-einval; } if (unlikely (!adap->algo)) {//adapter has completed the implementation of the communication method Pr_err ("I2c-core:attempt to register adapter '%s ' with" "No algo!\n", adap->name); Return-einval; } rt_mutex_init (adap->bus_lock); Mutex_init (adap->userspace_clients_lock); Init_list_head

Understand PHP hash function, enhance password security _php tips

$DFDA807D832B094184FAEU1ELWHTR2XHTUVS3R9J1NFRGBCUDCCZC '; Assume this is the password the user entered to log back in $password = "Verysecret"; if (Check_password ($hash, $password)) { echo "Access granted!"; } else { echo "Access denied!"; } function Check_password ($hash, $password) { Characters include algorithm, cost and salt Let ' s call it $full _salt $full _salt = substr ($hash, 0, 29); Run the hash function on $password $new _hash = Crypt ($password, $full _salt

Two ways to write a I2C device driver

commandI2c_func_smbus_write_word_data processing SMBUS write_word_data command...Analysis I2c_smbus_read_byte_data (i2c_smbus_byte_data): I2c_smbus_xfer (I2c_smbus_byte_data) i2c_smbus_xfer_emulated (i2c_smbus_byte_data) Msg[1].len = 1; ...//setting read Data i2c_msg I2c_transfer ()///FINAL call to I2c_adapter//m set in I2C-S3C2410.C Aster_xfer () function Adap->algo->master_xfer () (2) Write:{/* Check whether the I2c_adapter supports read-byte funct

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