Properties of secure hash functions

The news of NIST and their SHA-3 algorithm competition and a recent lunch and learn at Denim Group reminded me of the Cryptographic lectures I gave at UTSA. One of the hardest concepts my students had grasping was secure cryptographic hash functions, partially because of the number theory, but al...

Exploit Fully Breaks SHA-1, Lowers the Attack Bar

A proof-of-concept attack has been pioneered that “fully and practically” breaks the Secure Hash Algorithm 1 SHA-1 code-signing encryption, used by legacy computers to sign the certificates that authenticate software downloads and prevent man-in-the-middle tampering. The exploit was developed by...

CVE-2005-4900

SHA-1 is not collision resistant, which makes it easier for context-dependent attackers to conduct spoofing attacks, as demonstrated by attacks on the use of SHA-1 in TLS 1.2. NOTE: this CVE exists to provide a common identifier for referencing this SHA-1 issue; the existence of an identifier is...

CVE-2004-2761

The MD5 Message-Digest Algorithm is not collision resistant, which makes it easier for context-dependent attackers to conduct spoofing attacks, as demonstrated by attacks on the use of MD5 in the signature algorithm of an X.509 certificate...

CVE-2004-2761

CVE-2004-2761 describes that the MD5 Message-Digest Algorithm is not collision resistant, enabling context-dependent spoofing attacks, notably in X.509 certificate signatures. Several connected sources corroborate this weakness and its use in real-world contexts (e.g., Red Hat SCEP / PKI componen...

SHA family hash functions cryptographic weakness

Cryptographic weakness found making real strength against coliisions: collisions in the the full SHA-1 in 269 hash operations, much less than the brute-force attack of 280 operations based on the hash length. Collisions in SHA-0 in 239 operations. Collisions in 58-round SHA-1 in 233 operations...

PT-2005-1108

Name of the Vulnerable Software and Affected Versions SHA-1 affected versions not specified Description The issue is related to the SHA-1 algorithm not being collision resistant, making it easier for attackers to conduct spoofing attacks. This has been demonstrated by attacks on the use of SHA-1 ...