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Why is hashing all database inputs not considered encryption of the database and what values does hashing database entries from server to client?
Nowadays, simply hashing the database does not provide enough encryption as hackers can run brute forcing software and/or dictionary attacks against them, also using hash decrypters.
With today's sophisticated GPUs, millions of hashes can be cracked a second with programs like John the Ripper and Hashcat. Salting the passwords and information is safer, but still not foolproof by a long way.
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How does hashing work in computer science and what are its applications in data security and encryption?
Hashing in computer science involves taking input data and generating a fixed-size string of characters, known as a hash value, using a specific algorithm. This hash value is unique to the input data and is used for various purposes, including data security and encryption. In data security, hashing is used to verify the integrity of data by comparing hash values before and after transmission or storage. If the hash values match, it indicates that the data has not been tampered with. Hashing is also used in password storage, where passwords are hashed before being stored in a database to protect them from unauthorized access. In encryption, hashing is used to securely store sensitive information, such as credit card numbers or personal data. Hashing algorithms are also used in digital signatures to verify the authenticity of a message or document. Overall, hashing plays a crucial role in data security and encryption by providing a way to securely store and verify data integrity.
What are hashing techniques that allow dynamic file expansion in dbms?
Dynamic hashing techniques, such as Extendible Hashing and Linear Hashing, allow for efficient file expansion in database management systems (DBMS). Extendible Hashing uses a directory structure that can grow as needed, allowing new buckets to be created without reorganizing existing data. Linear Hashing incrementally splits buckets based on a predetermined growth factor, enabling dynamic adjustment of the hash structure while maintaining efficient access. These techniques help manage variable data sizes and maintain performance as data volume changes.
Can you explain how to securely hash data for encryption purposes?
To securely hash data for encryption, you can use algorithms like SHA-256 or bcrypt. These algorithms take the input data and produce a fixed-length hash value. This hash value can be used as a key for encryption. It is important to use a strong and secure hashing algorithm to protect the data from being easily decrypted.
What are the difference between static and dynamic hashing in DBMS?
Search operation in static hashing is time consuming, but in dynamic hashing it is not.
How does two-way hashing work to securely encrypt and decrypt data in a single process?
Two-way hashing uses a mathematical algorithm to convert data into a fixed-length string of characters, making it difficult to reverse engineer the original data. This process allows for secure encryption and decryption of data using the same algorithm, providing a way to protect sensitive information.
How does hashing work in computer science and what are its applications in data security and encryption?
Hashing in computer science involves taking input data and generating a fixed-size string of characters, known as a hash value, using a specific algorithm. This hash value is unique to the input data and is used for various purposes, including data security and encryption. In data security, hashing is used to verify the integrity of data by comparing hash values before and after transmission or storage. If the hash values match, it indicates that the data has not been tampered with. Hashing is also used in password storage, where passwords are hashed before being stored in a database to protect them from unauthorized access. In encryption, hashing is used to securely store sensitive information, such as credit card numbers or personal data. Hashing algorithms are also used in digital signatures to verify the authenticity of a message or document. Overall, hashing plays a crucial role in data security and encryption by providing a way to securely store and verify data integrity.
What are the available encryptions in PHP?
PHP has built-in one way hashing using the md5 function. Additional encryption capabilities are available using the Mcrypt extension.
How do you store passwords?
Passwords should be stored using strong encryption techniques, such as hashing algorithms like SHA-256. It's essential to never store passwords in plain text. Additionally, incorporating salt (random data) into the encryption process adds an extra layer of security by making it harder for attackers to crack the passwords. Regularly updating encryption methods and storing passwords securely in a separate database can help protect user information.
What is the maximum number of entries that can be placed in the chained hash table?
The maximum number of entries that can be placed in a chained hash table is determined by the size of the underlying array used for storage. Each bucket in the array can hold multiple entries due to chaining, so the total number of entries that can be stored is dependent on the size of the array and the hashing function used.
What are hashing techniques that allow dynamic file expansion in dbms?
Dynamic hashing techniques, such as Extendible Hashing and Linear Hashing, allow for efficient file expansion in database management systems (DBMS). Extendible Hashing uses a directory structure that can grow as needed, allowing new buckets to be created without reorganizing existing data. Linear Hashing incrementally splits buckets based on a predetermined growth factor, enabling dynamic adjustment of the hash structure while maintaining efficient access. These techniques help manage variable data sizes and maintain performance as data volume changes.
What are different types of hashing techniques are there in DBMS?
there are 2 types of hashing techniques 1- Static hashing 2-Dynamic hashing
What is the meaning of the acronym SHA1?
Secure hashing algorithm refers to a 2 layer encryption device. This a very rare term and would not be commonly know to anyone not in the computer programming field.
What is Hash file organization in DBMS?
Hashing is the most common form of purely random access to a file or database. It is also used to access columns that do not have an index as an optimisation technique. Hash functions calculate the address of the page in which the record is to be stored based on one or more fields in the record. The records in a hash file appear randomly distributed across the available space. It requires some hashing algorithm and the technique. Hashing Algorithm converts a primary key value into a record address. The most popular form of hashing is division hashing with chained overflow.
Can you explain how to securely hash data for encryption purposes?
To securely hash data for encryption, you can use algorithms like SHA-256 or bcrypt. These algorithms take the input data and produce a fixed-length hash value. This hash value can be used as a key for encryption. It is important to use a strong and secure hashing algorithm to protect the data from being easily decrypted.
Explain the distinction between closed an open hashing discus the relative merits of each technique in database application?
A hash table is where data storage for a key-value pair is done by generating an index using a hash function. Open Hashing (aka Separate chaining) is simpler to implement, and more efficient for large records or sparse tables. Closed Hashing (aka Open Addressing) is more complex but can be more efficient, especially for small data records.
What are 3 basic operations of cryptography?
The three basic operations of cryptography are encryption, decryption, and hashing. Encryption transforms plaintext into ciphertext to protect data from unauthorized access, while decryption reverses this process, converting ciphertext back into readable plaintext. Hashing creates a fixed-size string of characters from input data, ensuring data integrity by allowing verification without revealing the original data. These operations work together to secure communication and protect sensitive information.
What are the difference between static and dynamic hashing in DBMS?
Search operation in static hashing is time consuming, but in dynamic hashing it is not.
