Trying to implement One-Time Pads in the modern era raises a single question: Transport: One-Time Pads are as secure as the secure channel used to deliver the keys.A malicious party can bit-flip the ciphertext. Authentication: One-Time Pads are stream ciphers and do not provide Message Authentication Codes (MAC).True randomness: Computers are deterministic, and they have no idea on how to create random numbers (unlike humans).Imagine if there are 5 million people, how much will the memory cost be? Storage: Storing a long pad with an equivalent length secret requires memory.Because of this, technically, One-Time Pads are usually not feasible to implement in theĬurrent era. Integrity and availability are not 100% covered. Confidentiality is assured with this cipher, but the Is not tampered), and Availability (ensures the data can be accessed anytime). In Computer Security, there are three pillars: Confidentiality (ensures only authorized personnel will read the data), Integrity (ensures data The key must be secret and never reused.

The key must be generated with true random number generator (TRNG).

The key must be as long as the plaintext.

Vigenère-Vernam Cipher algorithm is theoretically a 100% secure encryption algorithm, as long as you follow these (impossible) three points: Acts as a One-Time Pad (OTP) to ensure maximum security, and supports custom alphabets. Provides a dependency-free, secure symmetric encryption implementation with Vigenère-Vernam Cipher algorithm as a library for Go.

Vernam encryption algorithm