Cryptography with Python Tutorial
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- Hacking RSA Cipher
- RSA Cipher Decryption
- RSA Cipher Encryption
- Creating RSA Keys
- Understanding RSA Algorithm
- Symmetric & Asymmetric Cryptography
- Implementation of One Time Pad Cipher
- One Time Pad Cipher
- Implementing Vignere Cipher
- Understanding Vignere Cipher
- Python Modules of Cryptography
- Decryption of Simple Substitution Cipher
- Testing of Simple Substitution Cipher
- Simple Substitution Cipher
- Hacking Monoalphabetic Cipher
- Affine Ciphers
- Multiplicative Cipher
- XOR Process
- Base64 Encoding & Decoding
- Decryption of files
- Encryption of files
- Decryption of Transposition Cipher
- Encryption of Transposition Cipher
- Transposition Cipher
- ROT13 Algorithm
- Caesar Cipher
- Reverse Cipher
- Python Overview and Installation
- Double Strength Encryption
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One Time Pad Cipher
One Time Pad Cipher
One-time pad cipher is a type of Vignere cipher which includes the following features −
It is an unbreakable cipher.
The key is exactly same as the length of message which is encrypted.
The key is made up of random symbols.
As the name suggests, key is used one time only and never used again for any other message to be encrypted.
Due to this, encrypted message will be vulnerable to attack for a cryptanalyst. The key used for a one-time pad cipher is called pad, as it is printed on pads of paper.
Why is it Unbreakable?
The key is unbreakable owing to the following features −
The key is as long as the given message.
The key is truly random and specially auto-generated.
Key and plain text calculated as modulo 10/26/2.
Each key should be used once and destroyed by both sender and receiver.
There should be two copies of key: one with the sender and other with the receiver.
Encryption
To encrypt a letter, a user needs to write a key underneath the plaintext. The plaintext letter is placed on the top and the key letter on the left. The cross section achieved between two letters is the plain text. It is described in the example below −
Decryption
To decrypt a letter, user takes the key letter on the left and finds cipher text letter in that row. The plain text letter is placed at the top of the column where the user can find the cipher text letter.
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