TLS/SSL MAC security flaw

The document summarizes a security flaw in TLS/SSL that allows attackers to decrypt encrypted traffic by exploiting timing differences in error handling. Specifically, when padding is incorrect on encrypted records, servers may respond at different speeds depending on the stage the error is detected. This creates a timing side channel that can be used to gradually decrypt the last byte of records. The flaw was addressed in TLS 1.1 by standardizing error handling behavior. The document recommends not revealing too many error details and avoiding timing side channels to prevent similar attacks.