We show how to produce a forged (ciphertext,tag) pair for the scheme ALE with data and time complexity of 2 ALE encryptions of short messages and the same number of authentication attempts. We use a differential attack based on a local collision, which exploits the availability of extracted state bytes to the adversary. Our approach allows for a time-data complexity tradeoff, with an extreme ca...

Testing of biometric systems requires the consideration of aspects beyond technical and statistical parameters. Especially for testing biometric techniques based on behavior, human factors like intention and forgery strength need to be considered. In this paper, a test tool to support skilled forgeries by test subjects is presented for handwriting verification systems. The software tool has bee...

Testing of biometric systems requires the consideration of aspects beyond technical and statistical parameters. Especially for testing biometric techniques based on behavior, human factors like intention and forgery strength need to be considered. In this paper, a test tool to support skilled forgeries by test subjects is presented for handwriting verification systems. The software tool has bee...

In this paper we discuss the security of digital signature schemes based on error– correcting codes. Several attacks to the Xinmei scheme are surveyed, and some reasons given to explain why the Xinmei scheme failed, such as the linearity of the signature and the redundancy of public keys. Another weakness is found in the Alabbadi–Wicker scheme, which results in a universal forgery attack agains...

This paper is an introduction to cryptography. It covers secretkey message authentication codes, unpredictable random functions, public-key secret-sharing systems, and public-key signature systems.

After decades of evolution, the cellular system has become an indispensable part of modern life. Together with the convenience brought by the cellular system, many security issues have arisen. Message integrity protection is one of the urgent problems. The integrity of a message is usually protected by message authentication code (MAC). Forgery attacks are the primary threat to message integrit...

Seam-Carving is widely used for content-aware image resizing. To cope with the digital image forgery caused by Seam-Carving, a new detecting algorithm based on Benford’s law is presented. The algorithm utilize the probabilities of the first digits of quantized DCT coefficients from individual AC modes to detect Seam-Carving images. The experimental result shows that the performance of proposed ...

PAES is an authenticated encryption scheme designed by Ye et al., and submitted to the CAESAR competition. The designers claim that PAES-8, which is one of the designs of the PAES-family, provides 128-bit security in the nonce misuse model. In this note, we show our forgery attack against PAES-8. Our attack works in the nonce misuse model. The attack exploits the slow propagation of message dif...

In 1999, Yang and shieh proposed two password authentication schemes using smart cards. But in 2003, Sun and Yeh indicated that their schemes are subject to the forgery attack. So in 2005, Yang and Wang proposed an improvement of Yang and Shieh’s schemes to resist against Sun and Yeh’s attack. However in this paper, we will point out that Yang and Wang’s schemes still suffer from the forgery at...