The public key is used to encrypt the data. As it can be openly distributed, it’s called a public key. Once a public key encrypts the data, no one can use the public key to decrypt the data. On the other hand, the private key is used to decrypt the data. As it can’t be openly distributed but needs to be kept a secret, that’s why it’s called a private key. In symmetric cryptography, the private key can encrypt and decrypt data.
Public and private keys both have their special objectives and uses in cryptography. As for public vs. private keys, we will discuss some key factors to better understand the situation. These are - working mechanism, performance, visibility, type, sharing, and storing.
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This document provides an overview of the Kerberos network authentication protocol. It discusses that Kerberos was developed at MIT to allow secure authentication over insecure networks. It provides a high-level overview of how Kerberos uses tickets and session keys to authenticate users and allow access to services without reentering passwords. The document also summarizes the Needham-Schroeder protocol that inspired part of Kerberos' design and discusses some applications and weaknesses of the Kerberos protocol.
Kerberos is a network authentication protocol that was developed at MIT in the 1980s to allow nodes communicating over an insecure network to verify each other's identity. It uses tickets and session keys to allow clients and servers to communicate over a non-secure network and establish the identity of the users and servers. The Kerberos authentication process involves three main exchanges between the client, authentication server (KDC), and target server to authenticate users and allow access to services.
This document contains an aptitude test questionnaire with 4 sections: English questions, logical reasoning questions, mathematics questions, and visual reasoning questions. There are a total of 50 multiple choice questions across the 4 sections to be completed within 60 minutes. The English section contains 10 questions on topics like identifying implied meanings and determining the best choice to complete a series. The logical reasoning section has 20 questions testing logical thinking abilities. The mathematics section includes 10 quantitative reasoning and math calculation questions. Finally, the visual reasoning section presents 10 visual puzzles to identify matching shapes and components between options.
For a college course -- CNIT 141: Cryptography for Computer Networks, at City College San Francisco
Based on "Serious Cryptography: A Practical Introduction to Modern Encryption", by Jean-Philippe Aumasson, No Starch Press (November 6, 2017), ISBN-10: 1593278268 ISBN-13: 978-1593278267
Instructor: Sam Bowne
More info: https://samsclass.info/141/141_S19.shtml
Kerberos is a network authentication protocol that uses "tickets" to allow nodes on a non-secure network to prove their identity to one another securely. It provides mutual authentication and is protected against eavesdropping and replay attacks. Kerberos uses a central authentication server and ticket granting services to authenticate clients and allow them secure access to other services on the network. However, Kerberos has some limitations such as being vulnerable if the central authentication server is compromised.
This document provides an overview of common Linux networking commands such as ifconfig, route, traceroute, nslookup, arp, dig, and netstat that are used to configure network interfaces, display routing tables, trace network routes, lookup domain names, manage address resolution, query DNS servers, and view network statistics. It also discusses how to use ifconfig to assign IP addresses to interfaces, route to view routing tables, arp to manage the address resolution cache, and dig for more powerful DNS lookups than nslookup.
The document discusses stream ciphers and how they can be implemented in either hardware or software. It describes how stream ciphers work by generating a pseudorandom bitstream from a key and nonce that is XOR'd with the plaintext. Hardware-oriented stream ciphers were initially more efficient to implement than block ciphers using dedicated circuits like LFSRs. However, LFSR-based designs are insecure and modern software-oriented stream ciphers like Salsa20 are more efficient on CPUs. The document cautions that stream ciphers can be broken if the key and nonce are reused or if there are flaws in the implementation.
The document discusses Secure Electronic Transaction (SET), which is a protocol that aims to secure credit card transactions on the internet. It consists of a set of protocols to provide confidentiality, integrity, authentication, and non-repudiation. SET uses public key cryptography including digital signatures and certificates to authenticate parties and encrypt transaction information. The key steps in a SET transaction involve the customer sending encrypted order and payment information to the merchant, who then requests payment authorization from the payment gateway before fulfilling the order.
Overview of the TELNET protocol.
TELNET is a protocol providing platform independent, bi-directional byte-oriented communication between hosts (unlike rlogin which is Unix based).
Most often TELNET is used for remote login to hosts on the Internet.
TELNET is basically a TCP connection with interspersed TELNET control information.
TELNET may use option negotiation for providing additional services such as character echoing back to the sender.
TELNET does not provide any authentication and therefore should not be used in unsecure environments anymore. SSH (Secure SHell) should be used instead.
This document provides information on SMA series coaxial connectors manufactured by CMPTER Electronics. It includes specifications for various cable connectors, receptacles, and SMA connectors. The document discusses the electrical and mechanical specifications of SMA connectors, which are compact RF/microwave connectors commonly used from DC to 18 GHz. Tables provide dimensions for plugs, jacks, and other connector types.
Zotero is a free tool that helps users collect, organize, cite, and share research sources. It can automatically detect research content on websites and add it to a personal library with one click. Using the Zotero sync settings, a user can sync all their Zotero references, documents, and other materials to their IYTE cloud account using their IYTE email and password, allowing access to references and files from any computer. The document provides instructions on setting up a Zotero account and configuring the WEBDAV sync method to link a Zotero library with an IYTE cloud storage account.
Columnar transposition cipher works by writing the plaintext message in a grid with a fixed number of columns defined by the keyword, and then reading the ciphertext off by columns in the order defined by the letters in the keyword. For example, with the keyword "ZEBRAS" and plaintext "HAMDARD UNIVERSITY KARACHI", the message is written in a 6 column grid and read off as "AVYH MNIA AUSR DITC REKI HDRA". To decrypt, the recipient arranges the ciphertext in a grid based on the keyword and reads off by rows to obtain the original plaintext message.
Diving into byte code optimization in python Chetan Giridhar
?
The document discusses byte-code optimization in Python. It begins by explaining that Python source code is compiled into byte code, which is then executed by the CPython interpreter. It describes some of the key steps in the compilation process, including parsing the source code and generating an abstract syntax tree (AST) before compiling to bytecodes. The document then discusses some approaches for optimizing Python code at the byte-code level, including using tools like Pyrex, Psyco and the Python bytecode manipulation library BytePlay. It recommends always profiling applications to identify optimization opportunities and considering writing performance-critical portions as C extensions.
Short Presentation (2 Hrs) on SSL and TLS Protocol and its reference standard. Good for intermediate participant or technical who want to understand secure protocol an
FTP is a protocol that allows users to transfer files between computers over a TCP network using an FTP client and server. It uses ports 20 and 21, with port 20 for sending data and port 21 for control commands. FTP supports authentication but sends all data, including usernames and passwords, in clear text. TFTP is a simpler version of FTP that uses UDP port 69 and only supports sending and receiving files. It lacks many of FTP's advanced features but requires fewer resources. TFTP does not support authentication and sends all data in clear text.
The document discusses Telnet, a protocol that allows users to access remote computers. It provides an overview of Telnet's history and requirements, steps for connecting to a remote computer using Telnet, tips for its use, current applications, advantages of accessing systems remotely, and disadvantages of the text-based interface. The presentation concludes with thanks and references.
The document discusses stream ciphers and how they can be implemented in either hardware or software. It describes how stream ciphers work by generating a pseudorandom bitstream from a key and nonce that is XOR'd with the plaintext. Hardware-oriented stream ciphers were initially more efficient to implement than block ciphers using dedicated circuits like LFSRs. However, LFSR-based designs are insecure and modern software-oriented stream ciphers like Salsa20 are more efficient on CPUs. The document cautions that stream ciphers can be broken if the key and nonce are reused or if there are flaws in the implementation.
The document discusses Secure Electronic Transaction (SET), which is a protocol that aims to secure credit card transactions on the internet. It consists of a set of protocols to provide confidentiality, integrity, authentication, and non-repudiation. SET uses public key cryptography including digital signatures and certificates to authenticate parties and encrypt transaction information. The key steps in a SET transaction involve the customer sending encrypted order and payment information to the merchant, who then requests payment authorization from the payment gateway before fulfilling the order.
Overview of the TELNET protocol.
TELNET is a protocol providing platform independent, bi-directional byte-oriented communication between hosts (unlike rlogin which is Unix based).
Most often TELNET is used for remote login to hosts on the Internet.
TELNET is basically a TCP connection with interspersed TELNET control information.
TELNET may use option negotiation for providing additional services such as character echoing back to the sender.
TELNET does not provide any authentication and therefore should not be used in unsecure environments anymore. SSH (Secure SHell) should be used instead.
This document provides information on SMA series coaxial connectors manufactured by CMPTER Electronics. It includes specifications for various cable connectors, receptacles, and SMA connectors. The document discusses the electrical and mechanical specifications of SMA connectors, which are compact RF/microwave connectors commonly used from DC to 18 GHz. Tables provide dimensions for plugs, jacks, and other connector types.
Zotero is a free tool that helps users collect, organize, cite, and share research sources. It can automatically detect research content on websites and add it to a personal library with one click. Using the Zotero sync settings, a user can sync all their Zotero references, documents, and other materials to their IYTE cloud account using their IYTE email and password, allowing access to references and files from any computer. The document provides instructions on setting up a Zotero account and configuring the WEBDAV sync method to link a Zotero library with an IYTE cloud storage account.
Columnar transposition cipher works by writing the plaintext message in a grid with a fixed number of columns defined by the keyword, and then reading the ciphertext off by columns in the order defined by the letters in the keyword. For example, with the keyword "ZEBRAS" and plaintext "HAMDARD UNIVERSITY KARACHI", the message is written in a 6 column grid and read off as "AVYH MNIA AUSR DITC REKI HDRA". To decrypt, the recipient arranges the ciphertext in a grid based on the keyword and reads off by rows to obtain the original plaintext message.
Diving into byte code optimization in python Chetan Giridhar
?
The document discusses byte-code optimization in Python. It begins by explaining that Python source code is compiled into byte code, which is then executed by the CPython interpreter. It describes some of the key steps in the compilation process, including parsing the source code and generating an abstract syntax tree (AST) before compiling to bytecodes. The document then discusses some approaches for optimizing Python code at the byte-code level, including using tools like Pyrex, Psyco and the Python bytecode manipulation library BytePlay. It recommends always profiling applications to identify optimization opportunities and considering writing performance-critical portions as C extensions.
Short Presentation (2 Hrs) on SSL and TLS Protocol and its reference standard. Good for intermediate participant or technical who want to understand secure protocol an
FTP is a protocol that allows users to transfer files between computers over a TCP network using an FTP client and server. It uses ports 20 and 21, with port 20 for sending data and port 21 for control commands. FTP supports authentication but sends all data, including usernames and passwords, in clear text. TFTP is a simpler version of FTP that uses UDP port 69 and only supports sending and receiving files. It lacks many of FTP's advanced features but requires fewer resources. TFTP does not support authentication and sends all data in clear text.
The document discusses Telnet, a protocol that allows users to access remote computers. It provides an overview of Telnet's history and requirements, steps for connecting to a remote computer using Telnet, tips for its use, current applications, advantages of accessing systems remotely, and disadvantages of the text-based interface. The presentation concludes with thanks and references.
The document describes a thermal label printing scale for retail applications. It has a withdrawable printer for easy paper replacement, supports online PLU updating and editing, and can store up to 10,000 commodity items. The scale is waterproof, moisture-proof, and insect-resistant, making it suitable for harsh retail environments. It has a two-line LCD display, number pad, and function keys, and can interface with devices via Ethernet, WiFi, or RS232.
The document describes an E-POS kitchen display system. It lists the system's specifications, including 4GB of RAM expandable to 8GB, 120GB of storage that can increase to 500GB, an Intel Celeron processor, and the ability to run Windows 10, Android, or Linux. It also provides details on the 10, 15, and 17-inch touchscreen display options, with resolutions of 1280x800, 1366x768, and 1280x1024 pixels respectively. Connectivity includes USB, serial, audio, and LAN ports in a waterproof connector.
This document describes the Xtreme Turbo V2 15-inch POS touch terminal. It has an Intel Celeron processor, supports up to 16GB of RAM and SSD or HDD storage. Ports include HDMI, VGA, USB, LAN, audio jack. It runs Windows and Linux and has an adjustable 15-inch touchscreen. Optional accessories include printers, customer displays, and peripheral devices like card readers. The terminal provides a powerful and flexible POS solution for applications in retail, restaurants, banks, and more.
Grace series :
1) foldable stand
2) support from J1900, Apollo lake J3455, Celeron, Core i3/i5/i7
3) Easy Maintenance
4) expandable I/O set-up (panel PC side + base)
Grace series :
1) foldable stand
2) support from J1900, Apollo lake J3455, Celeron, Core i3/i5/i7
3) Easy Maintenance
4) expandable I/O set-up (panel PC side + base)
The document provides specifications for the CD-101C customer display, including a 10.1 inch display with 1024x600 resolution and 220 CD/m2 brightness. It operates on 5W of power from a DC5V/1A power source via a USB connector. The display supports 10 point PCAP touch and is produced by Partner Tech Corporation based in Taiwan.
The document describes the AUDREYA7 touch POS system and its specifications. It includes an Intel Core i3 processor, up to 16GB RAM, M.2 SSD storage, multiple ports and peripheral support like printers, displays and card readers. It has an industrial grade design in a slim form factor for retail and hospitality environments. Optional configurations include different displays, processors and operating systems.
This document describes the AD-21521.5" interactive kiosk from Partner Tech. The kiosk offers maximum style, efficiency and longevity for retail automation and self-service solutions. It provides endless possibilities to create superior customer experiences through innovative software, business intelligence and retail solutions. The kiosk features a 21.5" touchscreen, secure metal enclosure, optional camera and various I/O interfaces to support a wide range of industries and services.
The document introduces the Audrey series of POS terminals, including models A4, A5, and A7. The Audrey series offers various screen sizes and CPU options to fit different store layouts. The terminals feature a slim aluminum housing and support up to three displays. They are designed to provide an innovative yet stylish solution for retail and hospitality environments. The document provides detailed specifications for the A4, A5, and A7 models.
Partner tech shelf display system (draft)TAOKAI WU
?
The document describes a smart shelf system that allows retailers to display multimedia content and advertisements on smart shelf displays and televisions in stores. The system uses a central content management system (CMS) to upload, organize, and schedule content which is then distributed wirelessly to smart shelf media players and TV dongles in each store location. The CMS also provides analytics on advertising viewership. The smart shelf displays and TV dongle media players are powered over Ethernet or WiFi and support displaying content, running advertisements, and integrating with a store's point-of-sale system.
2. 2
1990
成立
2000
興櫃公開發行
1990
POS to 行動POS 與 Fintech
2007 Established branch office in Europe
2008 Established branch office in UK
Launched All in one printer integrated POS
2010 Launched cutting edge Enterprise Tablet with POS Base
2011 EM-220 acquire innovation reward by TW government
The IoT
2014 Perform strategic private equity
2015 Android mobile products and IOT ready
Payment Device
Expand technologies and solutions for IoT Era
POS
1994-1997 POS Peripherals
1994 Established branch office in USA
1997 First Taiwannese Company Develop Touch POS Terminal
2001 Established branch office in China
2003 Gov. Rewarded as Fast Growing Enterprise
Auto ID
Founded 1990
1994-2003 2004-2013 2014-Future
拍檔科技重大里程碑
300+位
全球員工
2400萬美金
資本額
2014年佳世達入股25%
2017年佳世達入股68%
5. 5
Domain knowledge across six major fields
VerticalIntegration
Qisda Business Solution Group
Manufacturing
Devices
Value Added
Reseller
Solutions
Providers
Services
Smart
Factory
Smart
Campus
Smart
Office
Smart
Hospital
Smart
Hotel
Smart
Store
8. 8
KioskDigital SignageTransform POSAll in one POS
AUDREY Series A4 A5 A7
ETHAN Series
SP-850
SMART POS Series
SP-1060 SP-550
SP-3500 SP-5514
X Series
Transformer Series
SP-2600 /SP-2500 11.6”~18.5”
X3w X2w/X2aX3a
Handheld Device
M1
All in one Mobile POS
MT M2
C1 C5
Counter Top Kiosk
Floor Stand Kiosk
Mobile POS
GRACE Series
Hardware Line-up
Check-In/Out Kiosk