40-bit encryption

About: 40-bit encryption is a research topic. Over the lifetime, 5434 publications have been published within this topic receiving 149016 citations.

System and method for content protection based on a combination of a user pin and a device specific identifier

Abstract: Disclosed herein are systems, methods, and non-transitory computer-readable storage media for encryption and key management. The method includes encrypting each file on a computing device with a unique file encryption key, encrypting each unique file encryption key with a corresponding class encryption key, and encrypting each class encryption key with an additional encryption key. Further disclosed are systems, methods, and non-transitory computer-readable storage media for encrypting a credential key chain. The method includes encrypting each credential on a computing device with a unique credential encryption key, encrypting each unique credential encryption key with a corresponding credential class encryption key, and encrypting each class encryption key with an additional encryption key. Additionally, a method of generating a cryptographic key based on a user-entered password and a device-specific identifier secret utilizing an encryption algorithm is disclosed.

File encryption method and system

Abstract: A file security system is disclosed in which both a deterministic, non-predictable, pseudo-random, symmetric encryption key and an encrypted information file are highly resistant to cryptographic analysis or brute force trial-and-error attacks. The encryption key is formed by first combining a constant value and a secret E-Key Seed in accordance with a logic, algebraic, and/or encryption function to shuffle bits and perform a first many-to-few bit mapping to provide a first pseudo-random result, and by operating upon the result with a secure one-way hash algorithm to perform a second many-to-few bit mapping and thereby provide a pseudo-random message digest. The message digest may be truncated to provide a deterministic encryption key. The information file to be protected is then encrypted with the encryption key, and thereafter the encryption key is destroyed by the file manager of the host system. The encrypted information file and the constant value then are concatenated, and the result is operated upon by a secure hash algorithm to provide a message integrity code. The constant value and a constant value checksum are inserted as headers at the beginning of the encrypted file, and the message integrity code, a redundant constant value, and a redundant constant value checksum are added as trailers at the end of the encrypted file. Any alteration of the encrypted file is reflected by the message integrity code. If a comparison of the constant value and redundant constant value indicates a match, the encryption key may be regenerated. If no match occurs, the checksums are tested to determine which of the constant value and redundant constant value is correct in order to regenerate the encryption key.

Space requirements for broadcast encryption

Abstract: Fiat and Naor [5] presented at Crypto '93 a new encryption scheme designed for broadcast transmissions. The feature of this scheme is to allow a central broadcast site to broadcast secure transmissions to an arbitrary set of recipients. In this paper we model the problem of unconditionally secure broadcast encryption schemes with an information theoretic framework. We obtain tight limitations both on the number of private keys associated with each user and on the number of keys generated by the center. Finally, we consider the model where interaction is allowed in the common key computation phase proving that the interaction cannot help in decreasing the size of the pieces of information given to the users in the broadcast encryption schemes.

Writing and reading encrypted data using time-based encryption keys

Abstract: In one aspect, a method to manage encrypted data includes configuring a first portion of a storage medium to store encrypted data. The encrypted data is encrypted using a time-based encryption key. The method also includes configuring a second portion of the storage medium to include metadata identifying the time-based encryption key and storing the time-based encryption key in a location other than the storage medium.