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Posted: August 4th, 2022
One-Time Pad Encryption Scheme
One-Time Pad Encryption Scheme
State the definition of the one-time pad encryption scheme for n-bit messages.
Your specification should include: the message space, the ciphertext space, the key space, and functions
Gen and so on
2. Why is the one-time pad not commonly used in practice?
One-Time Pad Encryption Scheme
One-Time Pad (OTP) encryption scheme is the encryption method where each byte of the plaintext is encrypted by one byte of a key stream, with each key byte being used only once. Since each key byte cannot be reused, the n-bit messages exchange requires a high amount of key. The equation used for generating the n-bit message through the one-time pad encryption algorithm is Ci=E (Pi, Ki) for I=1,2,3,…,n where E is the encryption operation, Ki represents the I-th byte of the key for the particular message, the plaintext I-th character is represented by Pi, Ci represents the I-th character of the resulting ciphertext, and the length of the key stream is represented by the n (Rabah, 2005). In the OTP encryption, the key is a string of random bits used for transforming the original message, which is referred to as plaintext, into the coded message, referred to as the ciphertext.
As much as the one-time pad offers high encryption to secure communication, the encryption is not commonly used in practice. The reasons behind the less use of the one-time pad encryption are based on its disadvantages. One of the disadvantages is that one-time pad encryption requires a pad with the same length as the message being encrypted (Poston & Dhandhania, 2020). With each pad having to be used only once, it becomes had to share the pad with the same length as the massage in real-time. When the message is long, the one-time pad would have to be as long as the plaintexts they encrypt, resulting in longer keys that might be less secure.
References
Poston, H., & Dhandhania, K. (2020). The One-Time Pad. Common Lounge. Retrieved from https://www.commonlounge.com/discussion/38f1706f8b6b43bd8fb71867ed903596
Rabah, K. (2005). Implementation of One-Time Pad Cryptography. Information Technology Journal, 4: 87-95. doi: 10.3923/itj.2005.87.95
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