Unconditional Security is a guarantee of security on ciphertext regardless of computational power or time. This means that the ciphertext cannot be broken in any condition, which usually means there are not enough information from the ciphertext to crack it down into plaintext.
Unconditional Security
- TNS3131 Chapter 2: Conventional Encryption and Message Confidentiality
- TAC3121 Chapter 1: Introduction
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One-Time Pad
One-Time Pad, or sometimes called One-Time Vernam Cipher#, is a #Substitution Cryptographic #algorithm that uses a single-use secret key for encrypting. It requires the key to be as long as the plaintext and random. Thus, guarantees an Unconditional Security# to the ciphertext. However, it does face some security concerns over secure key distribution and key generation for randomness. It is only used for low bandwidth and very high security purposes.