CRYPTOLOGY

Cryptology (encryption science) good example of the use of mathematics in our lives and has been used by people for secret communication for centuries. It’s used in a wide areas from personal data protection to country security today. Although encryption is made with computer programs with more complex methods today, it’s based on old mathematical methods.

                                E-BOOK  about Cryptology

                                VIDEO  about Encryption History

BASIC KNOWLEDGE

USEGA AREA OF ENCRYPTION

Cryptology is used in many important fields such as smart devices, e-signature, confidential communication, personal data security, retinal scanning, fake money scanning, TV radio waves, fingerprint scanning and country security etc... It is an indispensable part of our daily life.

ENCRYPTION TERMS

You can see below, some basic encryption terms: sender, receiver, plain alphabet, cipher alphabet, plaintext, ciphertext, key, encryption, decryption, and breaking cipher.

ENCRYPTION TYPES

Monoalphabetic Type: Only one alphabet is used in this type. Each letter in the plaintext always corresponds to the one fixed letter in the ciphertext. This type of cipher can be broken with the frequency analysis of letters.

Polyalphabetic Type: More than one alphabet is used in this type. Each letter in the plaintext corresponds to different letters in the ciphertext each time. Breaking this type is more difficult than monoalphabetic types. The frequency analysis method is not enough to break these types. İt can be broken by Kasiski analysis.

Substitution Type: Each letter/symbol in the plaintext is replaced by another letter/symbol according to the key (secret rule).

Transposition Type: Only the places of the letters in the plaintext are changed according to key.