Cryptography

Cryptography

Study of mathematical techniques for information security services, with the purpose of creating secrets.

Cryptanalysis

Study methods to defeat security services, aimed at breaking secrets.

Plaintext

Original message before encryption.

Ciphertext

Encrypted message that is unreadable to unauthorized users.

Confidentiality

Protection against unauthorized interception.

Integrity

Assurance that data is unaltered without authorization.

Authenticity

Verification of the true source of data.

Non-repudiation

Prevents denial of authorship.

Kerckhoffs's Principle

The security of a cryptosystem should remain even if everything besides the key is public knowledge.

Chosen-plaintext attack

Attacker chooses messages to discover corresponding ciphertexts.

Vigenère Cipher

Improvement on monoalphabetic substitution ciphers that uses a key shifting letters according to a repeating pattern.

One-Time Pad (OTP)

Encryption method that uses long, random keys for encryption equal to the length of the plaintext, ensuring perfect secrecy.

RSA Cryptography

Asymmetric cryptographic method involving key pairs (public and private) for secure data transmission.