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    • Certificate Authority

      Certificate Authority

      Certificate Authority or Certification Authority (CA) is an entity, which is core to many PKI (Public Key Infrastructure) schemes, whose purpose is to issue digital certificates to use by other parties. It exemplifies a trusted third party. Some certification authorities may charge a fee for their service while some other CAs are free. It is

    • Brute Force Attack

      Brute Force Attack

      A brute force attack consists of trying every possible code, combination, or password until the right one is found. Determining the Difficulty of a Brute Force Attack The difficulty of a brute force attack depends on several factors, such as: How long can the key be? How many possible values can each key component have?

    • Symmetric and Asymmetric ciphers

      Symmetric and Asymmetric ciphers

      In a symmetric cipher, both parties must use the same key for encryption and decryption. This means that the encryption key must be shared between the two parties before any messages can be decrypted. Symmetric systems are also known as shared secret systems or private key systems. Symmetric ciphers are significantly faster than asymmetric ciphers,

    • Substitution and Transposition Ciphers

      Substitution and Transposition Ciphers

      Substitution and transposition ciphers are two categories of ciphers used in classical cryptography. Substitution and transposition differ in how chunks of the message are handled by the encryption process. Substitution ciphers Substitution ciphers encrypt plaintext by changing the plaintext one piece at a time. The Caesar Cipher was an early substitution cipher. In the Caesar

    • RC4 (Rivest Cipher 4)

      RC4 (Rivest Cipher 4)

      RC4 is one of the most used software-based stream ciphers in the world. The cipher is included in popular Internet protocols such as SSL (Secure Sockets Layer) and WEP (for wireless network security). The cipher is fairly simplistic when compared to competing algorithms of the same strength and boasts one of the fastest speeds of

    • Cryptographic Algorithms

      Cryptographic Algorithms

      Symmetric Cryptographic Algorithms DES (Data Encryption Standard) is perhaps the most widely used cryptographic algorithm. DES is based upon IBM’s Lucifer algorithm. The NBS (National Bureau of Standards) and the NSA (National Security Agency) adopted DES as a federal standard in 1977. DES is a symmetric cipher with an effective key length of 56 bits.

    • RSA (Rivest, Shamir, and Adleman)

      RSA (Rivest, Shamir, and Adleman)

      RSA, which stands for Rivest, Shamir, and Adleman, is a security algorithm used in digital cryptography. RSA differs from older symmetric algorithms because it has the ability of allowing digital signing as well as advanced encryption for online commerce systems and high-profile institutions. RSA was one of the first major advancements in digital cryptography but

    • Cryptographic Libraries

      Cryptographic Libraries

      Cryptology has quickly grown from a field only used by government and military agencies to being one that impacts the day to day lives of consumers across the globe. Cryptographic libraries are used by individuals in just about any country in the world when conducting secure online transactions, communicating via secure email or video, and

    • Wordlists

      Wordlists

      A wordlist is a text file containing a collection of words for use in a dictionary attack. Wordlist Usage A dictionary attack using a wordlist relies on the fact that most users choose weak passwords. Very common passwords include password, computer, work, and most of the popular female names. Common Dictionary Attacks Using A Wordlist

    • Known Ciphertext Attack

      Known Ciphertext Attack

      The known ciphertext attack, or ciphertext only attack (COA) is an attack method used in cryptanalysis when the attacker has access to a given set of ciphertext(s). The attacker does not have access to corresponding cleartext in this method; however, COA is successful when correspdonding plaintext can be determined from a given set of ciphertext.

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